Artigos de Revista
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Energy rate balance applied to coastal engineering problems by using RANS-VoF models in numerical wave flumes 
Nowadays, the use of RANS-based models for simulating numerical wave flumes and studying coastal engineering structures is common and allows investigating accurately phenomena that occur in current/wavestructure interactions. Comprehension of energy transformations in these processes can support designers tooptimize the system. In this study, a methodology to evaluate the terms of the energy rate balance in coastalengineering problems is developed. The methodology is applied to the propagation of regular waves in numericalwave flumes, onshore oscillating water column wave energy converter integrated into a vertical breakwater, andtwo types of rubble-mound breakwaters. The direct determination of the energy rate due to viscous and urbulencelosses and the porous resistance in rubble-mound breakwaters are carried out by time integration insidethe computational domain. Besides, the reflected and transmitted energy rates in the flume are calculated bymeans of this methodology, instead of the standard gauge methods, commonly used in physical and numericalflumes. Complementary, studies may be carried out for random incident waves and the methodology can beapplied to 3D wave tanks.
Ano: 2025
Autor(es): Teixeira, P.; Didier, E.
Revista: Ocean Engineering
Editor: Elsevier
Keywords: Rubble-mound breakwater; Oscillating water column wave energy converter; Energy rate balance; Coastal engineering; Numerical wave flume; RANS models
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An assessment of 3D scanning methods in physical models
The evaluation of damage progression caused by wave action on physical models of rubble-mound breakwaters can be accomplished through two types of methods: quantifying the movements and falls of the resistant armor elements by visual inspection (the traditional, classical method) or determining the eroded volumes and depths between consecutive surveys of armor layers using sensors and photogrammetric methods (3D scanning methods). Of the latter, one may use techniques such as the so-called "Kinect", "Photogrammetry" and "LiDAR". The end-product of these techniques is, among others, point clouds, which allow obtaining three-dimensional surface models. In this paper, four of the latter techniques (3D scanning methods) are briefly described, and a comparison is made between them regarding their usability in current tests, their advantages and disadvantages, among themselves for a study case of the physical 3D model of the Ericeira breakwater. In evaluating survey quality across the four methods, RMSE (root mean square error) was employed to align obtained point clouds with ground control points (GCP). Notably, Photogrammetry, Kinect, and Azure techniques showed excellent RMSE values. Conversely, the LiDAR-derived-method cloud, using a smartphone with LiDAR sensor and 3dScanner app, fails to yield acceptable and accurate results for the research objectives of this paper.
Ano: 2024
Autor(es): Capitão, R.; Lemos, R.; Fortes, C. J. E. M.; Jónatas, R.
Editor: COSE
Keywords: 3D scans; Reconstruction Techniques; Damage Progression; Breakwater; Physical Modelling
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Analytical and numerical modelling of wave dissipation over rigid and flexible vegetation in a flume: Drag coefficient calibration
Data of wave dissipation over vegetation fields was collected from laboratory flume experiments, fordifferent vegetation and wave conditions. An analytical model and a numerical model are applied to estimatethe wave dissipation obtained in the experiments, through the calibration of the bulk drag coefficient (CD).Results and conclusions will analyse and compare each model behaviour and obtained CD values.
Ano: 2024
Autor(es): Reis, R.; Fortes, C. J. E. M.; Suzuki , T.
Editor: IARH EUROPE CONGRESS
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Deep Neural Network Enhanced Early Warning System for Ports Operations
Downtime of port terminals results in large economic losses and has a major impact on the overallcompetitiveness of ports. EarlyWarning Systems (EWS) are an effective tool to reduce ports
Ano: 2024
Autor(es): Pinheiro, L.; Fortes, C. J. E. M.; Gomes, A.
Editor: IARH EUROPE CONGRESS
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Development of a Bayesian network-based early warning system for storm-driven coastal erosion
Coastal hazards such as flooding and erosion can cause large economic and human losses. Under this threat, early warning systems can be very cost-effective solutions for disaster preparation. The goal of this study was to develop, test, and implement an operational coastal erosion early warning system supported by a particular method of machine learning. Thus, the system combines Bayesian Networks, and state-of-the-art numerical models, such as XBeach and SWAN, to predict storm erosion impacts in urbanized areas. This system was developed in two phases. In the development phase, all information required to apply the machine learning method was generated including the definition of hundreds of oceanic synthetic storms, modeling of the erosion caused by these storms, and characterization of the impact levels according to a newly defined eerosion iimpact index. This adimensional index relates the distance from the edge of the dune/beach scarp to buildings and the height of that scarp. Finally, a Bayesian Network that acted as a surrogate of the previously generated information was built. After the training of the network, the conditional probability tables were created. These tables constituted the ground knowledge to make the predictions in the second phase. This methodology was validated (1) by comparing 6-h predictions obtained with the Bayesian Network and with process-based models, the latest considered as the benchmark, and (2) by assessing the predictive skills of the Bayesian Network through the unbiased iterative k-fold cross-validation procedure. Regarding the first comparison, the analysis considered the entire duration of three large storms whose return periods were 10, 16, and 25 years, and it was observed that the Bayesian Network correctly predicted between 64% and 72% of the impacts during the course of the storms, depending on the area analyzed. Importantly, this method was also able to identify when the hazardous conditions disappeared after predicting potential consequences. Regarding the Regarding the second validation approach, second validation approach, the k-fold cross-validation procedure was applied to the peak of a set of varying storms and it demonstrated that the predictive skills were maximized (63%
Ano: 2024
Número Páginas:
1-15pp.
Autor(es): Garzon, J.L.; Ferreira, Ó.; PLOMARITIS, T.A.; Zózimo, A. C.; Fortes, C. J. E. M.; Pinheiro, L.
Revista: Coastal Engineering
Editor: Elsevier
Volume:
Vol 189 (104460).
Keywords: HIDRALERTA; Sandy beaches; Bayesian networks; Numerical modeling; Prediction system
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Development of a Bayesian network-based early warning system for storm-driven coastal erosion
Coastal hazards such as flooding and erosion can cause large economic and human losses. Under this threat, early warning systems can be very cost-effective solutions for disaster preparation. The goal of this study was todevelop, test, and implement an operational coastal erosion early warning system supported by a particularmethod of machine learning. Thus, the system combines Bayesian Networks, and state-of-the-art numericalmodels, such as XBeach and SWAN, to predict storm erosion impacts in urbanized areas. This system wasdeveloped in two phases. In the development phase, all information required to apply the machine learningmethod was generated including the definition of hundreds of oceanic synthetic storms, modeling of the erosioncaused by these storms, and characterization of the impact levels according to a newly defined eerosion iimpactindex. This adimensional index relates the distance from the edge of the dune/beach scarp to buildings and theheight of that scarp. Finally, a Bayesian Network that acted as a surrogate of the previously generated informationwas built. After the training of the network, the conditional probability tables were created. These tablesconstituted the ground knowledge to make the predictions in the second phase. This methodology was validated(1) by comparing 6-h predictions obtained with the Bayesian Network and with process-based models, the latestconsidered as the benchmark, and (2) by assessing the predictive skills of the Bayesian Network through theunbiased iterative k-fold cross-validation procedure. Regarding the first comparison, the analysis considered theentire duration of three large storms whose return periods were 10, 16, and 25 years, and it was observed that theBayesian Network correctly predicted between 64% and 72% of the impacts during the course of the storms,depending on the area analyzed. Importantly, this method was also able to identify when the hazardous conditionsdisappeared after predicting potential consequences. Regarding the Regarding the second validationapproach, second validation approach, the k-fold cross-validation procedure was applied to the peak of a set ofvarying storms and it demonstrated that the predictive skills were maximized (63%
Ano: 2024
Autor(es): Garzon, J.L.; Ferreira, O.; PLOMARITIS, T.A.; Zózimo, A. C.; Fortes, C. J. E. M.; Pinheiro, L.
Revista: Coastal Engineering
Editor: Elsevier
Volume:
189 (2024) 104460.
Keywords: HIDRALERTA; Sandy beaches; Bayesian networks; Numerical modeling; Prediction system
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Experimental investigation of wave severity and mooring pretension on the operability of a moored tanker in a port terminal
This paper investigates the influence of sea severity and mooring line pretension configuration on the operabilityof a moored vessel at a modified berthing site inside a port. A physical model was constructed to replicate thenew layout of the port of Leix
Ano: 2024
Autor(es): Abdelwahab, H.S.; Pinheiro, L.; Santos, J. A.; Fortes, C. J. E. M.; Guedes Soares, C.
Revista: Ocean Engineering
Editor: Elsevier
Volume:
291 (2024) 116243.
Keywords: Mooring pretension; Moored ship; Ship motions; Port downtime; Ship operability; Physical modelling
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Experimental study of an onshore dual chamber oscillating water column device
A wave flume is used to study a scaled model of a stepped bottom dual-chamber Oscillating Water Column (OWC) installed onshore. Compared to traditional single-chamber OWCs, the use of dual-chambers is expected to widen the range of sea states in which the OWC is more efficient, and the step, in front of the first chamber, boosts the capturing energy capacity of the device. The Power Take-Off (PTO) system is modelled as an air opening in the pneumatic chambers. Several experiments combining regular incident waves and PTO damping conditions are performed. Results of the amplitudes of the free surface elevations inside the chambers show that the device can amplify the incident wave amplitude up to 1.57 times in chamber 2. Results of the primary efficiency show that the device is highly dependent on the PTO damping characteristics and can reach around 40% for a wide range of wave periods. Results of the reflection analysis show that the reflection coefficient is also dependent on the PTO damping characteristics but remain lower than 0.6 for all the studied cases. Sloshing phenomenon (mostly in the cross-section direction) was observed for a wavelength close to the cross-section dimension, impacting negatively on the device pneumatic performance.
Ano: 2024
Número Páginas:
16p..
Autor(es): Gadelho, J.; REZANEJAD, K.; Guedes Soares, C.; Santos, J. A.; Anastas, G.; Fortes, C. J. E. M.
Revista: Ocean Engineering
Editor: Elsevier
Volume:
Volume 300 (117240).
Keywords: Reflection coefficients; Efficiency improvement; Breakwater; Experiments; Oscillating water column
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Experimental study on drag coefficient of flexible vegetation under non-breaking waves
Laboratory experiments of wave propagation over rigid and flexible vegetation fields, with the same configurations, were conducted to understand the effect of vegetation flexibility on the drag coefficient (CD). The direct method and the least squares method (LSM), based on force and flow measurements, are applied to calculate the CD in the experimental conditions. The formulations of both methods are extended to estimate the CD for flexible vegetation cases. A video analysis was performed to account for the swaying motion. Typically, wave dissipation is lower for flexible than for rigid vegetation of the same configuration, under the same flow condition. Therefore, a proportional effect in the corresponding CD results, obtained from common CD calibration to wave dissipation without considering vegetation motion, is usually observed. However, the present results show that although the wave dissipation was 34% lower for flexible relative to rigid vegetation, the respective CD values were close. CD estimations considering vegetation motion and inertia suggest that CD of flexible vegetation was up to 13% higher relative to rigid vegetation. Accounting for inertia reduced the CD for rigid vegetation up to 7%, while raised the CD for flexible vegetation up to 13%.
Ano: 2024
Número Páginas:
14p..
Autor(es): Reis, R.; Fortes, C. J. E. M.; Rodrigues, J.; HU, Z.; Suzuki , T.
Revista: Ocean Engineering
Editor: Elsevier
Volume:
Volume 296.
Keywords: Wave dissipation; Inertia; Vegetation motion; Flexible vegetation; Drag coefficient
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Exploring Wave
Aquatic vegetation in the littoral zone plays a crucial role in attenuating wave energy andprotecting coastal communities from hazardous events. This study contributes to the developmentof numerical models aimed at designing nature-based coastal defense systems. Specifically, a novelnumerical application for simulating wave
Ano: 2024
Autor(es): El Rahi, J.; Martinez-Estevez, I.; Reis, R.; Tagliafierro, B.; Dominguez, J.M.; Crespo, A.J.C.; Stratigaki, V.; Suzuki, T.; Troch, P.
Editor: MDPI
Keywords: Project chrono; DualSPHysics; SPH-FEA coupling; Fluid
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Comunicações
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Wave runup and overtopping assessment by using video methodologies in physical models
Physical modelling is one of the tools to help characterize wave runup and overtopping in maritime structures. Usually, the determination of wave runup is made by using resistive wave gauges along the breakwater slope while the evaluation of overtopping volumes (individual or total) is made by weighing the water overtopped with a scale that is collected in a reservoir installed on this scale.Nowadays, non-intrusive methodologies for the assessment of those parameters are being used, due to their simplicity and low cost. Video cameras, constitute a good alternative to old methods; however, their performance depends essentially on the post-processing methodologies used.The present paper presents the application of the Timestack methodology done so far, in the evaluation of: wave runup in 2D and 3D physical tests. The video-derived statistical parameters of wave runup (Rumax, Rumin, Rumed e Ru2%) are compared with the corresponded ones obtained with resistive wave gauges. The total water volume and the average overtopping flow rate from video data is compared with the one collected by a reservoir. Those cases will illustrate the advantages and drawbacks associated with Timestack methodology.
Ano: 2023
Número Páginas:
71-71pp..
Autor(es): Lemos, R.; Fortes, C. J. E. M.; Mendonça, A.C.; Andriolo, U.
Editor: Yildiz Technical University
Keywords: Overtopping; Runup; Timestack
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3.ª e 4.ª fases de ampliação do Molhe Leste do Porto de Sines
Encontra-se em curso a empreitada da 3.ª Fase de ampliação do Molhe Leste do Porto de Sines em 750 m, a qual irá conferir a esta estrutura um comprimento total de 2250 m. Esta empreitada tem por intuito permitir alargar a bacia portuária abrigada que se encontra dedicada ao Terminal de Contentores de Sines (Terminal XXI), de molde a permitir (i) garantir condições adequadas de abrigo à agitação marítima dos novos postos de acostagem do Terminal ainda não construídos, (ii) proporcionar melhores condições de manobras de acesso e rotação dos navios de maiores dimensões, (iii) incrementar a operacionalidade do posto já existente, cujas taxas de utilização têm vindo a crescer, e (iv) não condicionar a expansão do porto para sul.
Ano: 2022
Autor(es): Luis, L.; Freire, S.; Barros, J.; Lemos, R.; Silva, L. G.; Fortes, C. J. E. M.; Neves, M. G.; Idalino, S.; Aparício, L.
Editor: PIANC
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Assessing wave-induced flooding risk at the Algarve coast for current and future conditions
Wave-induced flooding represents a threat and sea-level risk will exacerbate the problem.
Ano: 2022
Autor(es): Garzon, J.L.; Zózimo, A. C.; Ferreira, Ó.; Ferreira, A. M.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.
Editor: 7as Jornadas de Engenharia Hidrográfica / 2as Jornadas Luso-Espanholas de Hidrografia
Keywords: XBeach; wave overtopping; sea-level rise; coast flooding; Bayesian network
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Assessment of wave-induced flooding risk under current and future conditions
Disaster risk reduction are crucial to minimize the loss of lives and livelihoods, and to enhance community resilience and preparedness to extreme climate-related events.
Ano: 2022
Autor(es): Zózimo, A. C.; Hervas, J.; Ferreira, A. M.; Ferreira, Ó.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Manz, A.; Pinheiro, L.
Editor: 16th International Conference Littoral22
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AVALIAÇÃO DE VOLUMES INDIVIDUAIS GALGADOS NA ERICEIRA COM O MODELO NUMÉRICO SWASH
Neste trabalho, utilizou-se o modelo numérico SWASH para avaliar os volumes galgados em ondas individuais no quebra-mar da Ericeira. Começa-se por definir o valor do coeficiente de Manning a utilizar no talude do quebra-mar, para simular perda de energia provocada pela rugosidade e pela percolação no processo do galgamento, comparando o volume galgado previsto pelo modelo numérico com os valores medidos nos ensaios com modelo físico realizados no LNEC, para um dado estado de agitação. Depois, para ondas selecionadas do mesmo estado de agitação verifica-se se o modelo numérico fornece valores semelhantes aos do mesmo modelo físico.
Ano: 2022
Autor(es): Santos, J. A.; Fortes, C. J. E. M.; Gomes, J.
Editor: CLME2022
Keywords: modelo numérico; modelo reduzido; quebra-mar de taludes; galgamento
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BlueSafePort Project
This paper presents a safety system for maneuvering and moored ships at the Port of Sines developed in the scope of the BlueSafePort project. The system is described in terms of its development and architecture, the functioning of its numerical models, the data flow and processing and the risk assessment used to issue alerts. The web platform and the mobile application where the relevant results to assess the referred risks are disseminated are also presented. The system provides 3-day advance forecasts of sea agitation, wind and tide conditions, as well as ship motions, identifying situations that could have serious consequences for ships maneuvering or moored inside the port. The system issues alerts associated with risk levels based on safety and operability criteria for ships' motions and forces in their mooring systems.
Ano: 2022
Autor(es): Pinheiro, L.; Fortes, C. J. E. M.; Gomes, A.; Santos, J. A.; Guedes Soares, C.
Editor: MARTECH2022
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Caraterização da agitação marítima e das sobrelevações em torno das obras de expansão e requalificação do Porto Inglês (Ilha do Maio
No âmbito do projeto das
Ano: 2022
Autor(es): Soares, R. E.; Fortes, C. J. E. M.; Neves, M. G.; Lemos, R.; Costa, C.E.B.C.; Silva, L. G.; Pinheiro, L.
Editor: AQUIMAR
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Comparação de técnicas fotogramétricas na reconstituição digital do modelo físico 3D do prolongamento do molhe leste do porto de Sines
Neste trabalho são apresentados os resultados da comparação entre três metodologias para obtenção de modelos tridimensionais de superfície, aplicadas à situação específica do modelo físico 3D do prolongamento do molhe leste do porto de Sines: são elas as aqui designadas técnicas
Ano: 2022
Número Páginas:
12p.
Autor(es): Capitão, R.; Fortes, C. J. E. M.; Lemos, R.
Editor: PIANC
Keywords: Técnicas fotogramétricas; LiDAR; Metashape; Kinect; Levantamentos tridimensionais
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Damage evolution of rubble-mound breakwaters based on aerophotogrammetric surveys
Due to its extensive coastal zone, Portugal owns many related maritime structures, the most common of whichare breakwaters that usually protect man-made harbours.These maritime structures, especially rubble-mound breakwaters, are assumed to be at risk in the design proccess, due to the load they can withstand. Therefore, at some point in the life of the marine structure, repairs willbe required, and monitoring programs are deemed of paramount importance in assessing damage evolution ofsuch structures.The use of an UAV (Unmanned Aerial Vehicle), or drone, has enriched ongoing LNEC
Ano: 2022
Autor(es): Lemos, R.; Capitão, R.; Fortes, C. J. E. M.; Henriques, M.; Ferreira, J.; Jóia, C.
Editor: 16th International Conference Littoral22
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Estudos e projetos do prolongamento do quebra-mar exterior do Porto de Leixões
Entre 2016 e 2020 foram realizados os Estudos e Projetos e Estudos de Impacto Ambiental (EIA) dos projetos do Prolongamento do Quebra-mar Exterior e das Acessibilidades Marítimas do Porto de Leixões, os quais envolveram ensaios em modelo físico reduzido realizados no Laboratório Nacional de Engenharia Civil (LNEC) entre outubro 2016 e abril 2017, encontrando-se atualmente em curso a respetiva empreitada de construção. Os estudos, projetos e ensaios bi e tridimensionais em modelo reduzido do Prolongamento do Quebra-mar Exterior em cerca de 300 m, destacam-se essencialmente por se tratar de um quebra-mar sujeito a um regime de agitação consideravelmente severo e por envolver o uso de blocos de betão de alta densidade (peso especifico de 27,2 kN/m3 a 32 kN/m3 ) do tipo Antifer, cujo comportamento idráulico e estrutural, apesar da experiência adquirida na utilização deste tipo de blocos no Molhe Sul da Barra do Rio Douro (também com betão com peso especifico de 32 kN/m3) e no Molhe Leste de Sines (peso especifico de 25,4 kN/m3 a 30,8 kN/m3), ainda se reveste de alguma complexidade. No âmbito destes estudos realizou-se inicialmente o Estudo Prévio (EP), com base no qual se realizaram os ensaios bi e tridimensionais, e em simultâneo com estes últimos, realizou-se o Projeto de Execução (PE). Neste, e com o objetivo de aumentar a segurança da estrutura, adotaram-se generalizadamente blocos de maior peso do que os ensaiados. Pretende-se com esta comunicação destacar as particularidades da adoção de blocos
Ano: 2022
Autor(es): Luis, L.; Freire, S.; Barros, J.; Lopes, H.; Lemos, R.; Fortes, C. J. E. M.; Neves, M. G.
Editor: PIANC
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Capítulos de Livros
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Multi-functional artificial reefs for coastal protection
N/A
Ano: 2009
Número Páginas:
153-210 pp.
Autor(es): Voorde, M.; Antunes do Carmo, J.; Neves, M. G.
Editor: Ch. A. Hudspeth, T. E. Reeve
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Teses de Doutoramento
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Trapped-mode propagation along irregular coasts
N/A
Ano: 1999
Número Páginas:
159 p.
Autor(es): Santos, J. A.
Editor: ******
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Probabilistic Assessment of the Safety of Coastal Structures
N/A
Ano: 1998
Número Páginas:
594 p.
Autor(es): Reis, M. T.
Editor: ******
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Unsteady Nearshore Currents on Longshore Varying Topographies
N/A
Ano: 1998
Número Páginas:
346 p.
Autor(es): Sancho, F. E.
Editor: ******
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Simulação da agitação irregular. Técnicas matemáticas
N/A
Ano: 1973
Autor(es): Carvalho, M. M.
Editor: ******
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Relatórios
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Estudo da agitação da doca de Pedrouços.
N/A
Ano: 1965
Autor(es): Vera-Cruz, D.
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Study of groyne sistems against coast erosion. Progress report until December 1964
N/A
Ano: 1965
Número Páginas:
41.
Autor(es): Barceló, J. P.
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Estudo de sistemas de esporões para combater a erosão costeira. 6º Relatório semestral Julho-Dezembro de 1963
N/A
Ano: 1964
Número Páginas:
6 pp.
Autor(es): Barceló, J. P.
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Estudo de sistemas de esporões para combater a erosão costeira. Actividade até Dezembro de 1964
N/A
Ano: 1964
Número Páginas:
42.
Autor(es): Barceló, J. P.
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Estudo em modelo das obras do porto de Leixões. Ensaios de agitação. 3º Relatório
N/A
Ano: 1964
Autor(es): Vera-Cruz, D.
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Estudo em modelo de obras do porto de Leixões. Ensaios de Agitação. 1º Relatório
N/A
Ano: 1964
Autor(es): Vera-Cruz, D.
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Estudo em modelo de obras do porto de Leixões. Ensaios de agitação. 2º Relatório
N/A
Ano: 1964
Autor(es): Vera-Cruz, D.
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Estudo hidráulico da obra marítima do aterro Glória-Botafogo. Características da agitação na enseada da Glória. Nota informativa
N/A
Ano: 1964
Autor(es): Elias, N.
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Study of groin sistems against coast erosion. 7th Semestrial report. January-June 1964
N/A
Ano: 1964
Autor(es): Barceló, J. P.
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Ensaio em modelo reduzido do porto de Angra do Heroísmo. Obra destinada a evitar as reflexões da ondulação ao longo da muralha da estrada 28 de Maio.
N/A
Ano: 1963
Autor(es): Barroco, E. M.
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Outros
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Risk Perception of Coastal Flooding in Praia da Vitória, Azores
The project LIFEGARACHICO (LIFE20 CCA/ES/001641) proposes the creation of an effective flexible adaptation framework for the coastal unicipalities of Macaronesia, making specific local interventions to increase their resilience against extreme coastal events resulting from climate change. Social surveys were applied in Praia da Vitória, Terceira, Azores, to understand the civilians perception of coastal flooding events.
Ano: 2024
Autor(es): Lima, L.; Fortes, C. J. E. M.; Zózimo, A. C.; Pinheiro, L.
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Social Surveys Indicating the Resilience of Urban Coastal Localities in Macaronesia to Coastal Flooding
The project LIFE-GARACHICO (LIFE20 CCA/ES/001641) proposes the creation of an effective flexible adaptation framework for the coastal municipalities of Macaronesia, making specific local interventions to increase their resilience against extreme coastal events resulting from climate change. Social surveys were applied in both localities in order to understand the civilians perception of coastal flooding events
Ano: 2024
Autor(es): Fortes, C. J. E. M.; Lima, L.; Zózimo, A. C.; Pinheiro, L.; Modino, R.; Barroso, J. G.; Cruz, C. G.; Comes, L.
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Avaliação da Estabilidade do Quebra-Mar Destacado do Porto Inglês (Ilha do Maio
Realização de ensaios em modelo físico reduzido 3D para a avaliação da estabilidade do quebra-mar destacado do Porto Inlgês, Maio, Cabo-Verde
Ano: 2023
Autor(es): Soares, R. E.; Fortes, C. J. E. M.; Lemos, R.; Costa, C.E.B.C.; Silva, L. G.; Pinheiro, L.; Neves, M. G.
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Physical modelling of wave-induced plant drag coefficient
N/A
Ano: 2019
Autor(es): Reis, R.; Suzuki , T.; LUBBERS, B.; Fortes, C. J. E. M.; Pires Silva, A.
Keywords: Flume experiments; Wave propagation; Plant flexibility; Vegetation
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Evaluation of wave overtopping consequences for risk assessment using ANP methodology
Adverse sea conditions can cause emergency situations associated to wave overtopping, which endanger the safety of people and goods, with negative impacts for society, the economy and the environment. Therefore, a methodology to assess the overtopping risk in port and coastal areas is essential for a proper planning and management of these areas.The Portuguese National Laboratory for Civil Engineering (LNEC) has been developing the HIDRALERTA system, an integrated decision-support tool for port and coastal management, which focus in preventing and supporting the management of emergency situations and the long-term planning of interventions in the study areas. It enables the user to calculate the risk for various port and coastal activities, starting with the characterization of sea-waves, wind field and tide levels at the study regions.HIDRALERTA was already tested at different places in Portugal: Costa da Caparica beach, in Almada, and port of Praia da Vitória, in the Azores. However, in both cases, the evaluation of wave overtopping / flooding consequences was carried out using a quite simple approach. In fact, such consequences were assessed only at a global and qualitative level, based on information provided by the responsible authorities.This paper aims at testing a quantitative methodology to evaluate overtopping consequences: the Analytic Network Process (ANP). This methodology was proposed to solve complex decision-making problems and its objective is to calculate the priorities among decision elements which will define their final weights on the consequences. The ANP approach can produce interdependencies between criteria and compute the respective weight of each criterion. Such a network model with dependence and feedback improves the priorities derived from judgements and makes prediction more accurate. So, the ANP allows comparison among clusters of elements. Furthermore, in this methodology we take into account the impacts of alternatives on the importance of criteria, by normalizing the comparison matrix. Thus, the given alternatives can influence the ranking of criteria.Application of the ANP methodology to the case study of Praia da Vitória port is presented and a consequences level map is obtained.
Ano: 2016
Autor(es): Lourenço, I.; Santos, J. A.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Poseiro, P.; Craveiro, J.
Keywords: Praia da Vitória port; Analytic Network Process (ANP); Risk; Wave overtopping
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Sistema de alerta para a navegação em portos
Apresenta-se um novo sistema de alerta para navios amarrados em portos que se encontra em desenvolvimento no Laboratório Nacional de Engenharia Civil. O sistema SWAMS_ALERTA é um sistema de previsão e alerta baseado na avaliação do risco associado ao comportamento de navios amarrados em zonas portuárias.Os riscos associados a navios amarrados decorrem de movimentos excessivos, quer no plano horizontal, quer no plano vertical. Estes movimentos podem condicionar as atividades portuárias, nomeadamente cargas e descargas, mas em casos extremos podem levar à ocorrência de situações de emergência, tais como rotura de cabos, rotura de cabeços de amarração ou até colisões com o cais. As consequências deste tipo de situações envolvem sempre grandes prejuízos materiais e por vezes humanos.O sistema SWAMS_ALERTA utiliza as medições e previsões de agitação marítima para a determinação dos seus efeitos em termos de movimentos nos seis graus de liberdade e forças nas amarras e defensas quando o navio se encontra estacionado no cais. Para tal, o sistema recorre a uma série de modelos numéricos, interligados entre si. A comparação destes valores com valores máximos admissíveis pré-estabelecidos permite a avaliação, em tempo real, de situações de emergência e a emissão de alertas dirigidos às entidades portuárias.O sistema é constituído por 4 módulos:I
Ano: 2016
Autor(es): Pinheiro, L.; Lopes, P.; Fortes, C. J. E. M.; Santos, J. A.
Keywords: Navios amarrados; Riscos; Sistema de previsão e alerta
CONSTRUÇÃO DA EXPANSÃO DO PORTO DE SAL-REI 1ª FASE (ILHA DA BOAVISTA CABO VERDE) Ensaios bidimensionais em modelo reduzido Parecer Técnico
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Definição da Geometria para um Recife Artificial Multifuncional em Leirosa (Poster)
N/A
Ano: 2010
Número Páginas:
1.
Autor(es): Neves, M. G.; Antunes do Carmo, J.
Editor: Gestão Costeira: Vulnerabilidades e Riscos na Região Centro
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Probabilistic Assessment of Hazards from Overtopping of Seawalls in Urban Environments: Annual Report of pOST-dOCTORAL rESEARCH
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Ano: 2005
Autor(es): Reis, M. T. L. G. V.
Editor: ******
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Ano: 2004
Autor(es): J.A Covas
Editor: ******
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Departamento de Hidráulica e Ambiente
