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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Numerical simulation of low Reynolds number flows over two circular cylinders in tandem
Flow interference between two circularcylinders, with same diameter D, in tandemarrangement is investigated numerically using afully coupled resolution method. Numericalsimulations are performed for Reynolds numberRe=200, with centre-to-centre cylinder distance Lvarying from 1.5 to 10D. The two-dimensionalNavier-Stokes equations are written in integral formand discretized by the finite volume method forunstructured grids. Equations are solved using anoriginal fully coupled resolution method, withoutany transformation of continuity equation, thatallows obtaining simultaneously velocity andpressure fields. Results analysis shows that changein flow topology occurs at L=4D and manifests by alarge jump on mean and fluctuating forces andStrouhal number. Similar trend is observed forpresent results at Re=200 and that obtained in aprevious study at Re=100. It is show that maximumlift force is reached when vortex shedding of thetwo cylinders is in-phase and that forces acting oneach cylinder are influenced by the phase lag offluctuating lift between the two cylinders.
Ano: 2009
Número Páginas:
8p.
Autor(es): Didier, E.
Editor: The 14th International Conference on Fluid Flow Technologies
Keywords: Vortex shedding; Unstructured grid; Unsteady flow; Two tandem circular cylinders; Fully coupled resolution method; Finite volume
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Simulação numérica da interacção de uma onda regular com um cilindro submerso - Comparação de três códigos numéricos
Este artigo apresenta um estudo comparativo entre três códigos numéricos (CANAL, FLUENT e FLUINCO)com o objectivo de validar os dois últimos face a resultados experimentais. É simulada a interacção entre umaonda regular e um cilindro horizontal submerso perpendicularmente à direcção de propagação das ondas, como eixo a 3 raios de profundidade. O comprimento de onda utilizado corresponde a uma situação de grandeprofundidade.
Ano: 2009
Número Páginas:
9P.
Autor(es): Conde, J. M. P.; Didier, E.; Teixeira, P. R. F.
Keywords: Canal; Fluinco; Fluent; Vof; Interacção onda - cilindro submerso
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Simulação numérica de um dispositivo de aproveitamento da energia das ondas do tipo coluna de água oscilante
O potencial de utilização em grande escala da energia das ondas oceânicas tem a capacidade decobrir uma parcela considerável do consumo de energia eléctrica a nível mundial. O sistema decoluna de água oscilante (CAO) é considerado o tipo de dispositivo de aproveitamento da energia dasondas (DAEO) do oceano tecnicamente mais conhecido.No presente trabalho é aplicado o código comercial FLUENT que resolve as equações de Navier-Stokes utilizando a técnica VoF (Volume of Fluid) para simular a acção de uma onda regular sobreum DAEO-CAO. O objectivo do trabalho consiste na validação do código para este tipo deescoamentos, com o intuito de o aplicar de forma sistemática no projecto de sistemas deaproveitamento de energia das ondas.Neste artigo apresentam-se os resultados obtidos por simulação numérica para dois casos: ainteracção de uma onda regular com um cilindro horizontal totalmente submerso; e a interacção deuma onda regular com um DAEO-CAO. O primeiro caso, sendo bidimensional, permitiu determinarqual deveria ser o refinamento da malha a utilizar. A comparação dos resultados obtidos com dadosexperimentais e de outros códigos numéricos permitiu, face à boa qualidade dos resultados numéricos,optimizar a malha utilizada no segundo caso (tridimensional) de forma a obter resultados precisossem tempos de cálculo excessivos. O segundo caso simulado, que corresponde a um modelosimplificado de um DAEO-CAO, permitiu concluir da boa qualidade dos resultados obtidos, existindouma boa correspondência entre estes, os experimentais e os obtidos por outro código numérico.
Ano: 2009
Número Páginas:
8p.
Autor(es): Conde, J. M. P.; Didier, E.
Keywords: Fluent; Coluna de água oscilante; Energia das ondas; Propagação de ondas; Simulação numérica
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Simulação numérica não linear do escoamento gerado pela interacção entre a agitação marítima e conversores pontuais de energia das ondas
Neste trabalho apresentam-se os pormenores construtivos e valida-se um modelo numérico que tem por base ocódigo FLUENT-ANSYS. As equações da continuidade e de Navier-Stokes / Navier-Stokes-Reynolds sãoresolvidas numericamente utilizando-se uma técnica VoF na identificação da superfície livre. O modelo permiteassim simular escoamentos não lineares com superfície livre. Estuda-se a interacção não linear de uma ondamonocromática com um conversor de energia das ondas da família dos sistemas de corpos oscilantesaxissimétricos de absorção pontual.
Ano: 2009
Número Páginas:
10p.
Autor(es): Barreiro, T.; Didier, E.; Gil, L.; Alves, M.
Keywords: Vof; Superfície livre; Ceo; Energia das ondas
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Wave overtopping of a typical coastal structure of the Portuguese coast using a SPH model
Smoothed Particle Hydrodynamics (SPH) method is a mesh-free, Lagrangian, particle method for modeling freesurfaceflows. The potential range of applications is very wide (waves, impact on dams, offshore...) as the meshfreetechnique facilitates the simulation of highly distorted fluids/bodies, whereas Eulerian methods can bedifficult to apply. Models based on SPH are an option to address coastal processes, particularly the interactionbetween waves and coastal structures, i.e. wave overtopping, that is a practical problem in coastal engineering. Itinvolves complicated free surface deformations and SPH model is an ideal approach to simulate such a process.The paper presents an engineering application of SPH model to define the efficiency of a typical coastal structureof the Portuguese coast under stormy conditions. The model is used to characterize the run-up, free surfaceelevation near the structure and overtopping of the coastal structure, determining the maximum water velocityand water height over the structure. It is shown that numerical results, obtained for the prototype, present asimilar trend comparing with data from physical modeling performed in test flume, using a model scale of 1:40.
Ano: 2009
Número Páginas:
496-500.
Autor(es): Didier, E.; Neves, M. G.
Editor: Journal of Coastal Research
Keywords: Hydrodynamics; Lagrangian model; Interaction wave-coastal structure
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Previsão da Agitação Marítima no Estuário do Tejo utilizando o Modelo SWAN
N/A
Ano: 2006
Autor(es): Santos, J. A.; Capitão, R.; Coli, A. B.; Fortes, C. J. E. M.; Freire, P.
Editor: ******
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20 anos de ensaios em modelo reduzido para obras marítimas da Região Autónoma dos Açores
N/A
Ano: 2005
Autor(es): Silva, L. G.
Editor: ******
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An operational tool for wave regime characterization and propagation. Application to the Port of Sines
N/A
Ano: 2005
Autor(es): Pinheiro, L.; Fortes, C. J. E. M.; Neves, M. G.; Santos, J. A.
Editor: ******
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Análise do comportamento do modelo de propagação de ondas EpE_CG em grandes áreas costeiras: Barra do Anção e Porto de Sines
N/A
Ano: 2005
Autor(es): Fortes, C. J. E. M.; Fernandes, J. L. M.; Vaz dos Santos, M. A.
Editor: ******
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Análise do desempenho de filtros num modelo não-linear de propagação de ondas
N/A
Ano: 2005
Autor(es): Fortes, C. J. E. M.; Fernandes, J. L. M.
Editor: ******
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Capítulos de Livros
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Multi-functional artificial reefs for coastal protection
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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
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Ano: 1998
Número Páginas:
594 p.
Autor(es): Reis, M. T.
Editor: ******
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Unsteady Nearshore Currents on Longshore Varying Topographies
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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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Estudos e ensaios hidráulicos do dique sul do aterro de ligação do Aeroporto Internacional de Macau à nova cidade de Cotai. Estudo em modelo numérico do comportamento de navios amarrados.
N/A
Ano: 1995
Autor(es): Santos, J. A.
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Modelação por elementos finitos da propagação e de formação de ondas marítimas nas zonas costeiras. Relatório final incluindo ficha resumo, relatório de execução material e relatório de execução finan
N/A
Ano: 1995
Autor(es): Covas, J. A.; Fortes, C. J. E. M.
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Modelação por elementos finitos da propagação e deformação de ondas marítimas em zonas costeiras.
N/A
Ano: 1995
Autor(es): Fortes, C. J. E. M.
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Modelação por elementos finitos da propagação e deformação de ondas marítimas em zonas costeiras.
N/A
Ano: 1995
Autor(es): Fortes, C. J. E. M.; Covas, J. A.
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Modelação por elementos finitos da propagação e deformação de ondas marítimas nas zonas costeiras. Participação no Simpósio Internacional LITTORAL 94.
N/A
Ano: 1995
Autor(es): Fortes, C. J. E. M.; Capitão, R.
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Observação sistemática de obras marítimas. Acção de formação de observadores de obras marítimas.
N/A
Ano: 1995
Autor(es): Silva, L. G.
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Observação sistemática de obras marítimas. Base de dados Anosom. Manual de utilização.
N/A
Ano: 1995
Autor(es): Reis, M. T.; Silva, L. G.
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Porto da Baleeira. Estudo das condições de abrigo em modelo matemático.
N/A
Ano: 1995
Autor(es): Covas, J. A.; Fortes, C. J. E. M.
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Porto de pesca da Quarteira. Ensaios bidimensionais de estabilidade e galgamentos.
N/A
Ano: 1995
Autor(es): Silva, L. G.
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Porto de pesca de Quarteira. Ensaios tridimensionais de estabilidade e galgamentos.
N/A
Ano: 1995
Autor(es): Silva, L. G.
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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
N/A
Ano: 2005
Autor(es): Reis, M. T. L. G. V.
Editor: ******
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Guidelines and Recommendations for River Information Services - PIANC
N/A
Ano: 2004
Autor(es): J.A Covas
Editor: ******
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Departamento de Hidráulica e Ambiente
