Artigos de Revista
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
|
Comunicações
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
|
Livros
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
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Capítulos de Livros
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
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Teses de Doutoramento
Info
Lime-matakaolin hydration products: a microscopy analysis
Metakaolin (MK) is nowadays a well-known pozzolanic material being used in cement-based materials, like mortars and concretes. The reaction of MK with calcium hydroxide yields cementitious products, being calcium silicate hydrate (CSH), stratlingite (C2ASH8) and tetra calcium aluminium hydrate (C4AH13) the main phases formed at ambient temperature. The transformation of stratlingite and C4AH13 into hydrogarnet at long term is an important issue that may result in an increase in the porosity and a loss of compressive strength that can induce a complete material degradation. With the objective of studying the compounds formed in lime/MK pastes and their stability during time, blended pastes were prepared with several substitution rates (in weight) of lime by MK, and maintained at RH>95% and 23 ± 2 ºC. XRD and TGA-DTA were used to follow the kinetics of the lime/MK hydration as well the reaction products. Microscopic tests (SEM-EDS) results are performed and compared with the thermal and mineralogical data. The results obtained show that the quantity of the hydration products formed changes with the lime replacement, being the aluminum and calcium silicates more abundant in the higher MK content pastes, and C4AH13, C4ACH11 and C2ASH8 the major phases formed up to 90 days of curing.
Ano: 2012
Número Páginas:
145-148pp.
Autor(es): Gameiro, A.; Santos Silva, A.; Veiga, M. R.; Velosa, A.
Revista: Materiali in Tehnologije/Materials and Technology
Editor: Institut za kovinske materiale in tehnologije Ljubljana
Volume:
2.
Keywords: Metakaolin; Lime; Tga-dta; Xrd; Microscopy
Info
Masonry dams: Analysis of the historical profiles of Sazilly, Delocre, and Rankine
The significant advances in masonry dam design that took place in the second half of the 19th century are analyzed and discussed within the context of the historical development of dam construction. Particular reference is made to the gravity dam profiles proposed by Sazilly, Delocre, and Rankine, who pioneered the application of engineering concepts to dam design, basing the dam profile on the allowable stresses for the conditions of empty and full reservoir. These historical profiles are analyzed taking into consideration the present safety assessment procedures, by means of a numerical application developed for this purpose, based on limit analysis equilibrium methods, which considers the sliding failure mechanisms, the most critical for these structures. The study underlines the key role of uplift pressures, that was only addressed by Lévy after the accident of Bouzey Dam, and provides a critical understanding of the original design concepts, which is essential for the rehabilitation of these historical structures.
Ano: 2012
Número Páginas:
19-45pp.
Autor(es): Bretas, E. M.; Lemos, J. V.; Lourenço, P.
Revista: International Journal of Architectural Heritage
Editor: Taylor & Francis
Volume:
6.
Keywords: Safety assessment; Masonry dam
Info
Mechanical Performance and Economic Evaluation of Warm Mix Recycling Asphalt
In Portugal, a low temperature technique for pavement recycling has recently emerged. It consists of the warm mix recycled asphalt (WMRA) with bitumen emulsion. It is considered a very interesting solution in terms of technical, economic and environmental performance. Stiffness and fatigue resistance was evaluated by four point bending test was carried on. Permanent deformation was determined by wheel tracking test. Different asphalt recycled mixtures having different bitumen emulsion content were tested. An economic study for application of such mixtures was also made. It demonstrates the advantages of using WMRA with bitumen emulsion in relation to traditional hot mixes
Ano: 2012
Número Páginas:
286-296.
Autor(es): Almeida, M. D.; Gomes, J.; Antunes, M. L.
Revista: SciVerse ScienceDirect. Procedia Social and Behavioral Sciences 53
Keywords: Warm mixtures; Resistance to fatigue; Permanent deformation; Rap
Info
Metodologia de avaliação do risco associado ao galgamento de estruturas marítimas. Aplicação ao porto e à baía da Praia da Vitória, Açores, Portugal
Neste trabalho, descreve-se a metodologia desenvolvida para a avaliação do risco associado à ocorrência de galgamentos de estruturas portuárias e costeiras que foi implementada no sistema integrado de apoio à decisão na gestão portuária e costeira, GUIOMAR. Componente básica desta metodologia é a caracterização da agitação marítima incidente no trecho da estrutura em estudo e a estimação dos valores correspondentes do caudal médio galgado por unidade de comprimento do coroamento daquela estrutura. A determinação da agitação marítima é efetuada recorrendo a uma metodologia de acoplamento de modelos numéricos de propagação de ondas, com base em dados de agitação marítima provenientes de bóias ou de modelos regionais de previsão da agitação. O cálculo dos galgamentos é efetuado com recurso a uma ferramenta baseada na análise de redes neuronais. A avaliação simplificada do risco dos galgamentos aqui apresentada resulta da combinação dos valores da probabilidade e das consequências associados à ocorrência de caudais médios galgados que ultrapassam um determinado limiar de caudal galgado. Embora a definição deste limiar dependa das consequências dos galgamentos para a zona em estudo, considera-se apenas um valor para as consequências da ultrapassagem do limiar fixado, sem refletir a expectável variação dos prejuízos com o valor do caudal galgado. A probabilidade de excedência do limiar é determinada calculando o quociente entre o número de estados de agitação marítima incidentes na estrutura em que tal ultrapassagem ocorreu pelo número total de estados de agitação marítima incidentes na zona em estudo. Uma vez obtido o valor do risco é possível representar graficamente o grau de risco e o grau de aceitabilidade desse mesmo risco em cada zona e estrutura estudada. Esta informação é crucial do ponto de vista de planeamento a longo prazo de intervenções em zonas portuárias ou costeiras . Testou-se a metodologia com três trechos distintos de estruturas de proteção costeira ou portuária existentes na baía da Praia da Vitória, Ilha Terceira, Açores, onde se localiza o porto da Praia da Vitória. Os trechos estudados são: a secção do molhe sul do porto que protege diretamente o cais 12, um trecho da proteção marginal da baía diretamente em frente à entrada da baía da Praia da Vitória e o trecho corresponde ao perfil corrente do enraizamento do esporão existente na mesma zona. Em qualquer dos trechos estudados, avaliou-se o risco associado ao galgamento provocado pela agitação marítima incidente, sendo esta caraterizada pelas previsões correspondentes aos anos de 2009 e de 2010. Verificou-se que a metodologia aqui apresentada é simples e eficaz e que pode ser facilmente estendida a outros tipos de risco (navegação, inundação, etc.). Mais ainda, a metodologia agora implementada no sistema GUIOMAR constitui mais um passo e um contributo valioso no sentido de o tornar um sistema mais robusto e eficaz de apoio à gestão portuária e costeira.
Ano: 2012
Número Páginas:
291-312pp.
Autor(es): Neves, D. R.; Santos, J. A.; Reis, M. T.; Fortes, C. J. E. M.; Simões, A.; Azevedo, E. B.; Rodrigues, M. C.
Revista: Revista da Gestão Costeira Integrada/ Journal of Integrated Coastal Zone Management
Volume:
12(3).
Keywords: Modelos neuronais; Propagação de ondas; Guiomar; Avaliação de risco
Info
Métodos de avaliação do estado de conservação de edifícios desenvolvidos no LNEC: Características e possibilidades de aplicação
Neste artigo são descritos e comparados três métodos de avaliação do estado de conservação dos edifícios, desenvolvidos no LNEC na última década: «Metodologia de Certificação das Condições Mínimas de Habitabilidade», «Método de Avaliação do Estado de Conservação dos Imóveis» e «Método de Avaliação das Necessidades de Reabilitação». Em complemento, apresenta-se uma análise prospectiva das possibilidades de aplicação destes métodos.
Ano: 2012
Número Páginas:
5-18 p..
Autor(es): Branco Pedro, J.; Vilhena, A.; Paiva, J. A. V. de
Revista: Revista Engenharia Civil - UM
Editor: Universidade do Minho
Volume:
42.
Info
Mix design considerations for warm mix recycled asphalt with bitumen emulsion
Warm mix recycled asphalt with bitumen emulsion is a technique still in development, which has proved to be very promising, both in economic and environmental terms. This technology allows recycling at a lower temperature, increases the amount of recycled materials and thus, saves energy and reduces CO2 emissions. It allows to leverage existing raw materials on the degraded pavement and to reduce energy costs in the manufacture of the new mixture. The laboratory study was conducted to analyse the applicability of different design methods to be used with warm mix recycled asphalt, such as Marshall test, immersion compression test, evaluating of water sensitivity and stiffness modulus test. The objective of this paper is to contribute towards defining and developing a design method of such mixtures taking into account the heterogeneity of the recycled asphalt pavement(RAP).
Ano: 2012
Número Páginas:
7p.
Autor(es): Almeida, M. D.; Gomes, J.; Antunes, M. L.
Revista: Construction and Building Materials - journal homepage: www.elsevier.com/locate/conbuildmat
Editor: Construction and Building Materials
Volume:
Construction and Building Materials 28 (2012) 687693.
Keywords: Pavement recycling; Asphalt mixtures design; Warm mixtures
Info
Modelação numérica de ensaios realizados nos materiais do aterro da barragem de Odelouca
A caracterização mecânica e hidráulica dos materiais da Barragem de Odelouca, efectuada no Laboratório Nacional de Engenharia Civil (LNEC), é utilizada para a calibração dos modelos constitutivos a utilizar na modelação numérica da barragem. Assim, tendo como ponto de partida os resultados obtidos nos ensaios realizados durante a construção da barragem, procede-se à verificação da adequação e à calibração de modelos constitutivos existentes para descrever o comportamento mecânico e hidráulico dos materiais empregues no núcleo e das misturas de solo-enrocamento utilizadas nos maciços estabilizadores. A Barragem de Odelouca localiza-se no conselho de Silves e implanta-se na Ribeira de Odelouca, principal afluente do Rio Arade. Trata-se de uma barragem de perfil zonado, com um núcleo central constituído por coluviões e por solo residual do xisto, e maciços estabilizadores constituídos por xistos e grauvaques ripáveis. O programa explícito de diferenças finitas FLAC foi utilizado nas modelações numéricas. É feita uma comparação entre os resultados obtidos com o modelo Cam-clay (já implementado no software utilizado) e os obtidos com um modelo elasto-plástico não convencional implementado para o efeito, designado por sub-cedência, que descreve uma transição gradual entre o regime elástico e o elasto-plástico, para ambos os tipos de materiais colocados na barragem.
Ano: 2012
Número Páginas:
8p.
Autor(es): Brito, A.; Maranha, J. R.; Caldeira, L.
Revista: Actas do XIII Congresso Nacional de Geotecnia
Editor: Sociedade Portuguesa de Geotecnia
Info
Modelação tridimensional das pressões da água na fundação da barragem de Alqueva
Neste trabalho apresenta-se a aplicação de uma metodologia que pode ser usada para avaliar a segurança de barragens abóbada relativamente a estados limites últimos envolvendo a fundação. É usado o método dos elementos discretos e o programa 3DEC. Apresenta-se um modelo global da barragem e fundação, com o qual é possível efetuar análises mecânicas e análises hidráulicas. No modelo são representadas três das cinco principais famílias de descontinuidades do maciço e outras superfícies de descontinuidade, tais como a superfície de fundação e as juntas de contração da barragem. A influência da pressão da água na fundação na estabilidade de uma cunha do maciço a jusante da obra é analisada comparando os resultados obtidos sem subpressões, com os obtidos aplicando as pressões calculadas com o modelo hidráulico ou aplicando campos de pressões simplificados, definidos a partir de uma superfície freática compatível com as condições de fronteira.
Ano: 2012
Número Páginas:
18p.
Autor(es): Braga Farinha, M. L.; Lemos, J. V.; Maranha das Neves, E.
Revista: Atas do XIII Congresso Nacional de Geotecnia
Editor: Sociedade Portuguesa de Geotecnia
Keywords: Pressões da água; Maciços rochosos; Barragens de betaõ
Info
MODELLING OF HYDRODYNAMICS AROUND AN IMPERMEABLE BREAKWATER: COMPARISON BETWEEN PHYSICAL AND SPH NUMERICAL MODELING
This work presents the new developments and the validation of a Smoothed Particle Hydrodynamics (SPH) numerical model used in the National Laboratory of Civil Engineering (Laboratório Nacional de Engenharia Civil - LNEC) for studies in coastal engineering processes. Although the model requires a high CPU time, it proved to be very promising in the simulation of complex flows, such as the wave-structure interaction and the wave breaking phenomenon. For the SPH model validation, physical modeling tests were performed in one LNECs flume to study the interaction between an impermeable structure and an incident regular wave. The comparison between numerical and experimental results, i.e. free surface elevation, overtopping volume and pressure, shows the good accuracy of the SPH model to reproduce the various phenomena involving on the wave propagation and interaction with the structure, namely the wave breaking, the wave overtopping and the pressure field on the structure.
Ano: 2012
Número Páginas:
68-76pp.
Autor(es): Didier, E.; Neves, D. R.; Martins, R.; Neves, M. G.
Revista: Engenharia Térmica (Thermal Engineering)
Volume:
Volume 11, Nº 1-2.
Keywords: Pressure; Wave overtopping; Wave breaking; Breakwater; Sph
Info
MQ-LNEC/SIC - Relato nº 77.5 - Revisão bienal da ENGIMAIS
Qualificação de Gestor Geral da Qualidade no âmbito da Marca de Qualidade LNEC
Ano: 2012
Autor(es): Pinheiro de Lima, J.
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Dissertações de Mestrado
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
|
Relatórios
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
|
Informações Científicas e Técnicas
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
|
Memórias
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
|
Outros
Info
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberia) and export to the Gulf of Cadiz
A first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal
Ano: 2024
Número Páginas:
17p..
Autor(es): Cravo, A.; Rodrigues, M.; Forja, J.; Ortega, T.; Correia, C.; Sierra, A.
Revista: Science of the Total Environment
Editor: Elsevier
Volume:
(906)167094.
Keywords: Coastal lagoon; Ria Formosa; Gas mass transport; Water - atmosphere fluxes; Greenhouse gases
Info
Global and local geometrical imperfections of pultruded GFRP profiles based on a modal approach
ABSTRACT - The ultimate capacity of pultruded glass fibre reinforced polymer (pGFRP) profiles depends significantly on geometrical imperfections (GIs), given their sensitivity to buckling phenomena arising from both thin walls and low elastic moduli. However, GIs are not yet comprehensively addressed in design guidance. This paper proposes a new approach to characterize the initial GIs of pGFRP profiles based on a modal approach. Given the lack of comprehensive knowledge in this area, this study presents a highly accurate and robust methodology to measure GIs and dimensional deviations (DDs) in pGFRP profiles using a 3D contact coordinate measurement machine (CMM). The modal approach encompasses the measurement of dimensional parameters and a point cloud transformation that enables the assessment of GIs associated with pure buckling modes of pGFRP profiles. This procedure allows the quantification of three types of global GIs associated to (i) minor-axis (weak axis), (ii) major-axis (strong axis) bending, and (iii) twist. Additionally, the procedure also includes the assessment of local GIs, considering the wall (plate-like) imperfections. The separation of GIs into these four types (shape and amplitude) is of major relevance as its paves the way to the development of analytical design formulas for the strength prediction of pGFRP members. The approach described in this paper also serves two important purposes: (i) the statistical analysis of DDs and GIs of pGFRP members, and (ii) the identification of distinct shapes and amplitudes of GIs that form the basis for reliable design considerations of pGFRP members.
Ano: 2024
Número Páginas:
18p..
Autor(es): Silvestre, N.; Correia, J.; Pinheiro, A.; Ribeiro, A.; Lages Martins, L.; Lazzari, J.
Revista: Construction and Building Materials
Editor: ELSEVIER
Volume:
412 (2024) 134813.
Keywords: Modal decomposition; Geometrical imperfections; Dimensional deviation; 3D contact measurements; Pultruded profiles; Glass fibre reinforced polymer (GFRP)
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Número Páginas:
26p..
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: Buildings
Editor: MDPI
Volume:
13.
Keywords: Compatibility; 20th century; Portland cement; Lime
Info
20th Century Mortars: Physical and Mechanical Properties from Awarded Buildings in Lisbon (Portugal)
This paper addresses the study of renders and plasters
Ano: 2023
Autor(es): Mirão, J.; Veiga, M. R.; Santos Silva, A.; Almeida, L.
Revista: buildings
Editor: MDPI
Volume:
13.
Keywords: compatibility; 20th century; Portland cement; lime
Info
2DH modelling and mapping of surfbeat-driven flooding in the shadow of a jettied tidal inlet
Near estuaries and harbours, submerged shoals and defence structures impact the exposure to overtopping. These features may be accounted for in two-dimensional horizontal (2DH) numerical models, either based on phase resolving or phase-average solvers for wave propagation. In between, surfbeat solvers, such as in XBeach, combine an affordable computational cost with the ability to generate and propagate the longer infragravity (IG) waves. However, surfzone wave characteristics and the overtopping exposure modelled with XBeach are sensi tive to settings such as the shape of the forcing wave spectra and the numerical scheme for wave propagation. The present paper explores this sensitivity and assesses the performance of different inundation models built with the 2DH surfbeat solver of XBeach. These models were forced with downscaled water levels and directional wave spectra and the results fuelled a discussion bounded by data collected downdrift of the entrance to the harbour of Figueira da Foz (Portugal). The original second-order upwind scheme, which propagates short-waves with a lower numerical diffusion improved the model performance in terms of long-wave height, and an unconventional breaking criterion better represented the cross-shore distribution of short-wave height near the shore. A cali brated model was validated through the hindcast of an overtopping event observed under moderate swell forcing, and was used to map the overtopping exposure during a hypothetical combination of an energetic swell with a water level having a return period of ~70 years. Compared to the default wave spectra shape and model settings, using an appropriate representation of the short-wave directional spectrum at the open boundary was necessary to reproduce the observed overtopping extent. Refining the cross-shore resolution of the model helped to better represent the observed inundation extents, as also did the reduction of the friction coefficient. Addi tional phase-resolving simulations in 1DH overestimated IG wave energy and produced higher and more frequent overtopping discharges. The differences with the calibrated 2DH surfbeat model increased with the proximity of the inlet and with short-wave height and angle of incidence. Overall, required calibration steps were provided. They aim at making 2DH XBeach surfbeat a credible tool for 1) predicting short and IG wave characteristics up to the shoreline, as well as for 2) providing first estimates of exposure to overtopping in areas with shallow and alongshore-irregular morphologies.
Ano: 2023
Número Páginas:
1-21pp.
Autor(es): Freire, P.; Baptista, P.; Silva, P. A.; Henriques, M.; Azevedo, A.; Oliveira , F.; Fortunato, A. B.; Nahon, A.
Revista: Coastal Engineering
Editor: Elsevier B.V.
Volume:
184.
Keywords: XBeach; Infragravity waves; Ebb-tidal delta; Intermediate beach; Overtopping
Info
A ciência é do povo? Citizen science, reflexões sobre o conceito e os processos científicos da produção da verdade num mundo cada vez mais inseguro
À medida que as ameaças ambientais se multiplicam à escala global exige-se uma mais apurada reflexividade sobre as práticas humanas, as formas de utilização dos territórios e seus recursos e a capacidade de previsão e resposta quanto a eventos ambientais extremos, socialmente disruptivos. Ora, é esta capacidade de previsão que a ciência experimenta em uma dimensão cada vez menos segura, entrando em crise os modelos causais e a pertinência do conhecimento empírico baseado em observações do passado, pois o futuro torna-se progressivamente mais incerto e ameaçador. Incerteza e ameaça que se antecipam em cada crise, sob a manifestação dos riscos ambientais [1]. Algumas destas manifestações tornam-se indetetáveis para os sentidos humanos, a não ser pela própria visibilidade das consequências. As comunidades humanas encontram-se, assim, cada vez mais dependentes da análise e do discurso da ciência para perceberem (mesmo que na impossibilidade de compreenderem com exatidão os mecanismos de exposição) os riscos a que estão expostas. A humanidade parece, pois, acossada numa estrutura medieval do medo, o medo do invisível, na emergência de um novo tipo de sociedade colonizada pelo medo e que dá lugar a todas as derivas políticas [2]....
Ano: 2023
Autor(es): Craveiro, J.
Revista: Plataforma Barómetro Social
Editor: Instituto de Sociologia da Universidade do Porto
Keywords: Citizen Science.; Participação; Riscos ambientais
Info
A comprehensive performance assessment system for diagnosis and decision-support to improve water and energy efficiency and its demonstration in Portuguese collective irrigation systems.
In regions with a strong seasonal or interannual asymmetry in the distribution of precipitation and higher frequency of droughts, collective irrigation systems are vital infrastructures for agricultural activity. Although operating for decades, several systems have ageing infrastructures, with relevant water losses and pumping energy inefficiencies. Consequently, the systems are not adequately designed or operated to meet current and future water demand. Therefore, rehabilitation to improve water and energy efficiency while ensuring infrastructure, economic sustainability and service quality is crucial. In this sense, comprehensive approaches using performance assessment to support the planning process or benchmarking between water users associations play an essential role in improving efficiency in collective irrigation systems.
Ano: 2023
Número Páginas:
15p..
Autor(es): Alegre, H.; Cordeiro, D.; Arranja, C.; Moreira, M.; Beceiro, P.; Loureiro, D.
Revista: Agricultural Water Management
Editor: Elsevier
Volume:
Vol- 275.
Keywords: Water Users Association; Water and energy efficiency; Performance assessment system; Decision support; Diagnosis; Collective irrigation systems
Info
A European and Brazilian cross-national investigation into the Portuguese translation of soundscape perceptual attributes within the SATP project
This paper presents a cross-national investigation into the soundscape perceptual attributes translation from English into European and Brazilian Portuguese. It is a study within the scope of a larger project
Ano: 2023
Autor(es): Ribeiro, L. C.; Alves, S.; Carvalho, M. L. U.; Michalski, R.; Antunes S.
Revista: Applied Acoustics
Editor: Elsevier
Volume:
Vol. 211.
Keywords: ISO/TS 12913-2:2018; Translation Cross-national; Soundscape attributes
Info
A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Ano: 2023
Número Páginas:
420
Autor(es): Teixeira, P.; Didier, E.
Revista: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
Info
Aerodynamic characterization of the 516 Arouca Pedestrian suspension Bridge over the Paiva River
Given the 516 Arouca pedestrian suspension bridge
Ano: 2023
Número Páginas:
18 pp.
Autor(es): Marques da Silva, F.
Revista: Wind
Editor: MDPI
Volume:
3.
DOI:
10.3390/wind3010006
Keywords: wind tunnel; wind loading; suspended bridges
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