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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Avaliação do risco de galgamento do posto 2 do molhe oeste do porto de Sines
N/A
Ano: 2011
Número Páginas:
16p.
Autor(es): Neves, D. R.; Reis, M. T.; Fortes, C. J. E. M.; Santos, J. A.
Keywords: Molhe oeste do porto de sines; Redes neuronais; Guiomar; Risco; Galgamento
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Avaliação do risco para a navegação em zonas portuárias. Avanços na constituição de um sistema de suporte à decisão
O sistema integrado para a simulação da agitação marítima em zonas portuárias e costeiras, GUIOMAR, foi desenvolvido no Laboratório Nacional de Engenharia Civil (LNEC) com base no software comercial de Informação Geográfica, ArcGISTM. Neste trabalho descreve-se a aplicação deste sistema na avaliação do risco para a navegação em zonas portuárias.Criou-se um conjunto de procedimentos automáticos que implementam uma metodologia de avaliação do risco para a navegação, com base na altura do movimento vertical de um navio induzida pela agitação marítima incidente ao longo da sua trajectória. Nesta metodologia considera- -se o grau de risco como o produto do grau atribuído à probabilidade de ocorrência de movimentos verticais que ultrapassam um limiar pré-estabelecido pelo grau atribuído às consequências dessa excedência.A metodologia foi testada no porto da Praia da Vitória, na ilha Terceira, Açores. Assim, partindo das características da agitação marítima previstas no interior do porto com recurso aos modelos numéricos de propagação de ondas (SWAN e DREAMS), para o ano de 2009, determinaram-se as correspondentes alturas significativas dos movimentos verticais do N/M Fernão Gomes, utilizando a função de transferência definida com o modelo WAMIT, para duas trajectórias de entrada ao porto. A aplicação desta nova metodologia considerando as alturas significativas dos movimentos verticais obtidos e um limiar pré-estabelecido (0.5 m) permitiu construir mapas de risco ao longo das duas trajectórias do navio no interior do porto .Este trabalho constitui mais um passo na criação de um sistema de suporte à decisão para a navegação portuária
Ano: 2011
Número Páginas:
19p.
Autor(es): Neves, D. R.; Rodrigues, S.; Vieira, A. S.; Santos, J. A.; Fortes, C. J. E. M.; Reis, M. T.; Simões, A.; Azevedo, E. B.
Keywords: Porto da praia da vitória; Guiomar; Sistemas de informação geográfica; Navegação; Avaliação de risco
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Boussinesq-type numerical model for wave propagation near shore and wave penetration in harbors
Sea waves can pose significant problems to port infrastructures and activities. Hence the importanceof correctly predict and characterize the wave field inside ports, more precisely on navigation routesand berthing locations. This paper describes the numerical model BOUSS3W, a finite element model for nonlinearwave propagation near shore and wave penetration in harbors. This model is also able to perform resonancestudies in harbors. It is based upon an extended version of Boussinesq equations. Terms were added togenerate regular or irregular waves inside the numerical domain, absorb outgoing waves, partially reflectwaves at physical boundaries, control numerical instabilities and reproduce energy dissipation due to bottomfriction and wave breaking. Implementation of partial reflection, bottom friction and wave breaking are describedand applications to real and experimental test cases are presented, namely, Vila do Porto Harbor. Resultsare compared with physical model tests and other numerical models.
Ano: 2011
Número Páginas:
8p.
Autor(es): Pinheiro, L.; Fortes, C. J. E. M.; Santos, J. A.; Fernandes, J. L. M.; Walkley, Mark
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Calculation of the accelerated breaking-roller propagation speed and wave energy transfer to the roller
Wave breaking has different physics from the potential flow wave motion. The roller model introduced by Svendsen [1] illustrates the separation of the wave motion and the roller. The roller propagation speed, therefore, is a very important factor for the energy calculation of the bore.The wave celerity data collected at the wave tank displays that the maximum roller propagation speed occurs when the wave has already decayed due to the breaking. This fact clearly displays that the bore energy cannot be calculated only from the wave height as it is done for non-breaking waves.It is certain that most the energy is dissipated through the roller formation in the outer surfzone, but a certain amount of energy is transferred to the roller at the same time and it accelerates the bore speed. Slow decay of the roller propagation speed indicates that the excess energy left in the roller dissipates in the inner surfzone at much slower rate than in the outer surfzone. Therefore, these two zones have to be clearly separated, but the amount of energy transferred into the roller is unknown.In this paper, we focus on the examination of the peak roller propagation speed that appears at the border of the outer and the inner surfzone by using the experimental data collected at the wave tank. In that way, the initial condition of roller propagation speed can be determined for the inner surfzone. The energy conservation between the wave motion and the roller kinetic energy derives an equation to calculate the roller propagation speed. The energy transfer rate is estimated by adjusting the value given by the full energy conversion with the observed roller propagation speed. It is found that about half of the energy is transferred into the roller. The model successfully illustrates the peak bore propagation speed which existing formulae cannot explain.
Ano: 2011
Número Páginas:
10p.
Autor(es): Okamoto, T.; Fortes, C. J. E. M.
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Comparative analysis of wind generated waves on the Ilha Solteira lake, by using numerical models OndisaCAD and SWAN
This paper describes the in-situ measurements and the application of two wind wave generatednumerical models (SWAN and OndisaCaD) to the reservoir of Ilha Solteira dam in order tosimulate the wind waves generation and propagation in that reservoir. A comparison betweennumerical results for selected wind conditions (highest average wind speed and the highestwind speed) is made and discussed. SWAN is also applied to the wind conditions observedduring a six month period. This work permits to evaluate the performance of the numericalmodels and its adequacy to characterize the wind generated waves at that region.
Ano: 2011
Número Páginas:
594-603pp.
Autor(es): Vieira, A.; Fortes, C. J. E. M.; Maciel, G.; Minussi, C.R.
Keywords: Ilha solteira; Ondisacad; Swan; In-situ measurements; Numerical modeling; Wind waves
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Comportamento dum navio no interior dum porto sujeito a diversos estados de mar
Nesta comunicação descreve-se uma ferramenta numérica capaz de caracterizar a respostadum navio amarrado no interior dum porto sujeito à acção da agitação marítima.Para este efeito utilizam-se previsões de estados de mar ao largo do porto em questão que sãopropagados para o seu interior com um modelo numérico do tipo Boussinesq capaz de simularefeitos complexos como a refracção, difracção, reflexão parcial, interacções não lineares,dissipação de energia devida ao atrito de fundo e rebentação das ondas. O modelo é o BOUSSWMH(BOUSSinesq Wave Model for Harbours, Pinheiro et al. (2011), e permite uma descriçãoprecisa da evolução de estados de mar reais em zonas abrigadas de profundidade variável.As interacções entre ondas e estruturas flutuantes são modeladas com recurso ao pacoteMOORNAV, Santos 1994 que utiliza dois modelos: WAMIT (Korsemeyer et al., 1988) quedetermina com o método dos painéis a resposta do navio livre sujeito a ondas monocromáticasunidireccionais; e BAS (Mynett et al. 1985) que monta e resolve, no domínio do tempo, asequações de movimento de um navio amarrado no posto de acostagem levando em conta asséries temporais das forças devidas às ondas incidentes no navio, as funções de resposta aimpulso do navio e as relações constitutivas dos elementos do sistema de amarração.Descrevem-se os modelos numéricos BOUSS-WMH, WAMIT e BAS e a forma como osresultados são transferidos entre eles e apresenta-se uma aplicação desta ferramenta integradaa um navio amarrado num porto esquemático sujeito a quatro estados de mar diferentes.
Ano: 2011
Número Páginas:
20p.
Autor(es): Pinheiro, L.; Santos, J. A.; Fortes, C. J. E. M.; Fernandes, J. L. M.
Keywords: Portos; Agitação marítima; Navio amarrado
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Desempenho do modelo BOUSS3W na rebentação de ondas
Esta comunicação descreve a implementação da formulação da dissipação deenergia por rebentação da onda no modelo de elementos finitos BOUSS3W e respectivavalidação. Este modelo de elementos finitos é baseado nas equações de Boussinesqestendidas deduzidas por Nwogu válidas desde águas de profundidade intermédia a águaspouco profundas. O modelo permite simular a propagação não linear e dispersiva deondas regulares ou irregulares tendo em conta alguns dos fenómenos mais importantespresentes nas regiões costeiras. A implementação da rebentação da onda no modeloBOUSS3W é efectuada através da inclusão de termos de viscosidade turbulenta nasequações de conservação da quantidade de movimento, que é dependente de um conjuntode parâmetros relacionados com o início, fim e duração da rebentação, que têm de sercalibrados para cada caso de estudo. A validação da implementação da rebentação foiefectuada recorrendo a casos de propagação e rebentação de ondas regulares embatimetrias de complexidade diferente (perfis de praia de inclinação constante e do tipobarra-fossa). Para estes casos, existem resultados experimentais, considerando diferentescondições de agitação. É realizada uma análise estatística de modo a caracterizar odesempenho do modelo e a sua capacidade na simulação da rebentação e dos efeitos nãolineares.
Ano: 2011
Número Páginas:
20p.
Autor(es): Pinheiro, L.; Rodriguez, V.; Fortes, C. J. E. M.; Fernandes, J. L. M.
Keywords: Boussinesq; Rebentação de ondas; Elementos finitos
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Desenvolvimento e validação de um modelo smoothed particle hydrodynamics para aplicação a estruturas costeiras
Desde 2007, o modelo SPHysics tem vindo a ser estudado, desenvolvido e utilizado noLaboratório Nacional de Engenharia Civil (LNEC), com o objectivo de verificar a suaaplicabilidade a estudos de interacção onda-estrutura. Para continuar o seu desenvolvimento, omodelo necessita de ser validado de forma a se dispor de uma ferramenta útil.Para tal, iniciou-se recentemente o projecto de investigação
Ano: 2011
Número Páginas:
15p.
Autor(es): Didier, E.; Ferreira, Ó.; Matias, A.; Neves, M. G.; Reis, M. T.; Pacheco, A.
Info
Dune erosion and overwash in large-scale flume experiments
The present paper gives a general overview of the large-scale physicalmodel experiments performed at the LIM/UPC in Barcelona, within the EU-HydralabIII Integrated Infrastructure Initiative. The model tests have been carried out in a flumewith a sandy dune exposed to a combination of water levels and wave conditions. Differentregimes of wave attacks on the sandy beach/dune system have been investigated.In particular, the study provides a unique set of large-scale physical data concerningthe wave-induced dune overwash. Measurements of hydrodynamics, sediment concentrationsand beach-dune profile evolution have been carried out. Profile measurementshave been used to calibrate and validate a numerical model (Kobayashi et al. 2007) topredict beach-dune profile modifications over the near-shore region. The numericalmodel is shown to be in agreement with the experimental data.
Ano: 2011
Número Páginas:
796-809pp.
Autor(es): Tomasicchio, G.; D´Alessandro, F.; Fortes, C. J. E. M.; Ilic, S.; James, M.; Sanchez-Arcilla, A.; Sancho, F. E.; Schüttrumpf, H.
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Equação não linear de declive suave dependente do tempo com inclusão de dissipação de energia por rebentação
As equações não lineares de declive suave dependente do tempo são estendidasde forma a incluírem dissipação de energia por rebentação, através da consideração dastensões de Reynolds na equação da conservação da quantidade de movimento e dadedução de uma nova equação não linear de declive suave dependente do tempo. Omodelo apresentado neste trabalho é aplicado a um conjunto de ensaios em modelo físico,referentes à propagação e rebentação das ondas em praias de declive constante Os testesefectuados permitiram seleccionar o critério de rebentação e definir regras para adeterminação dos valores para as condições críticas de início e de fim da rebentação,calibrar o valor a atribuir à constante dos termos dissipativos e definir regras para a suadefinição, assim como para avaliar o desempenho do modelo. Foram obtidos bonsresultados, embora o empolamento da onda tenha sido subestimado. Verificou-se umaestreita relação entre o valor a utilizar para a condição crítica de início da rebentação ea declividade da onda à entrada do domínio de cálculo, e entre o valor da constante dostermos dissipativos e o número de Ursell à entrada do domínio
Ano: 2011
Número Páginas:
20p.
Autor(es): Zózimo, A. C.; Fortes, C. J. E. M.
Keywords: Critérios de rebentação; Modelação numérica; Equação não linear de declive suave dependente do tempo incluindo a rebentação das ondas; Rebentação das ondas
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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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Waterborne user's requirements.
N/A
Ano: 1995
Autor(es): Covas, J. A.
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An integrated harbour navigation control system. NATO Po-Navigation. Adenda ao "Project Plan" proposto ao "Programa Ciência para a Estabilidade. Fase III" da OTAN
N/A
Ano: 1994
Autor(es): Covas, J. A.
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Cais da Calheta, Ilha de S. Jorge - Açores. Memorando
N/A
Ano: 1994
Autor(es): Silva, L. G.
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Ensaios em modelo reduzido de uma protecção marítima aderente.
N/A
Ano: 1994
Autor(es): Silva, L. G.
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Ensaios tridimensionais de estabilidade e galgamentos do molhe de protecção do porto de recreio náutico do porto de Sines.
N/A
Ano: 1994
Autor(es): Silva, L. G.
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Estudo da localização de um terminal de importação de gás natural liquefeito. Análise das condições do porto de Sines. Estudos de agitação marítima.
N/A
Ano: 1994
Autor(es): Capitão, R.
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Estudo da localização de um terminal de importação de gás natural liquefeito. Selecção de locais viáveis. Estudos de agitação marítima.
N/A
Ano: 1994
Autor(es): Capitão, R.
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Ligação da lagoa de Óbidos ao mar - Estudos de agitação marítima.
N/A
Ano: 1994
Autor(es): Carvalho, M. M.; Capitão, R.; Fortes, C. J. E. M.; Covas, J. A.
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Modelação por elementos finitos da propagação e deformação de ondas marítimas em zonas costeiras.
N/A
Ano: 1994
Autor(es): Covas, J. A.; Fortes, C. J. E. M.
Info
Modelação por elementos finitos da propagação e deformação de ondas marítimas em zonas costeiras. Missão a Coimbra.
N/A
Ano: 1994
Autor(es): Covas, J. A.; Fortes, C. J. E. M.; Capitão, R.
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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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