Papers
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Extensão do molhe norte do Porto de Leixões: modelação física de um navio amarrado no posto A
O Porto de Leixões, localizado na costa norte de Portugal, é um dos maiores do país, recebendo diariamentevários navios de grandes dimensões. Um dos principais postos de acostagem situa-se à entrada do porto e encontra-se sujeito à agitação marítima que é difratada pelo olhe principal de proteção do porto. Para avaliar dos movimentos induzidos no navio estacionado nesse posto de acostagem e as forças exercidas nas suas amarras e defensas pela agitação incidente, utilizou-se o modelo físico de Leixões, construído num dos tanques do LNEC. Neste modelo físico, encontra-se representada a envolvente do porto de Leixões, assim como a sua batimetria. O modelo do navio
Year: 2020
Number Pages:
17-28pp.
Author(s): Pinheiro, L.; Pedro, F.; Abdelwahab, H.S.; Fortes, C. J. E. M.; Santos, J. A.; Capitão, R.
: Revista Recursos Hidricos
Editor: APRH
Volume:
Volume 41, Nº 1.
Keywords: Motions measurement; Constitutive relations; Moored ship; Scale model
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Numerical analysis of an onshore oscillating water column wave energy converter for different wall slopes
An alternative to the energy matrix expansion, due to the increase of global electricity demand, is the renewable sea wave energy source, which has high energy potential. The Oscillating Water Column (OWC) converter is one of the most studied, although it is not yet used at commercial scale. Therefore, searching the optimal geometric configuration is fundamental to turn this device viable. This study proposes a numerical analysis of an onshore OWC for different slopes of chamber walls (from 40o to 90o) and equipped with a Wells turbine. Simulations of incompressible 2D flows are performed by means of the FLUENT® software, which is based on Reynolds-averaged Navier-Stokes (RANS) equations. The k-
Year: 2020
Number Pages:
10-22pp.
Author(s): Güths, A.K.; Teixeira, P. R. F.; Didier, E.
: Revista Interdisciplinar de Pesquisa em Engenharia
Editor: RIPE
Volume:
Volume 6 No. 2.
Keywords: Numerical simulation; Renewable energy; Wave energy; Oscillating water column
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Numerical analysis of the influence of air compressibility effects on an oscillating water column wave energy converter chamber
The most studied device used for extracting wave energy is the Oscillating Water Column (OWC). In general, numerical simulations of these cases by means of models based on Reynolds Averaged Navier-Stokes equations adopt the Volume of Fluid method to deal with the free surface flow which is considered incompressible in both water and air. The aim of this study is to investigate the influence of the compressibility effect on the air inside the OWC chamber by the FLUENT® numerical model. A methodology is implemented, taking into account both water and air flows incompressible, but, at every instant, a pressure condition is imposed on the top boundary of the chamber to consider the compressibility effect. This pressure condition is based on an analytical equation that considers the isentropic transformation of the air and effects of Wells and impulse turbines. Results of compressible and incompressible numerical models are compared. The amplification factor, the root mean square of air pressure inside the chamber and OWC efficiency in relation to incident wave period, wave height and turbine characteristic relation are analyzed. Results show that air compressibility effects can diminish the predicted OWC efficiency up to about 20% in both Wells and impulse turbines.
Year: 2020
Number Pages:
1183-1193pp.
Author(s): Gonçalves, R.; Teixeira, P.; Didier, E.; Torres, F.
Editor: Elsevier
Volume:
Volume 153.
Keywords: Air compressibility; Volume of fluid; Numerical simulation; Oscillating water column device; Wave energy
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Numerical analysis of the performance of two onshore oscillating water column wave energy converters at different chamber wall slopes
In this study, a numerical analysis of the performance of two Oscillating Water Column (OWC) wave energy converters, at different front and back wall slopes, was carried out. The first device had vertical front and back walls and the second one had its wall slopes of 40° in relation to the horizontal plane. The FLUENT® numerical model, which is based on the Reynolds-Averaged Navier-Stokes (RANS) equations, was used. The Volume of Fluid (VoF) method was employed to take into account free surface flows. The case study comprised a 10 m deep flume with an onshore OWC at its end, equipped with a Wells turbine. A 2D hydrodynamic mathematical model was employed and a 3D air pressure effect inside the OWC air-chamber was considered. Analyses of the hydrodynamics behavior, fluid-structure interaction outside (run-up/down, reflected waves) and inside the chamber (free surface elevation, sloshing) and energy distribution (pneumatic extracted energy, reflected wave energy and energy losses) were conducted. Results showed that the device with inclined walls had the best efficiency in comparison with the other one. However, the latter showed lower variation in efficiency in the wave period range than the former.
Year: 2020
Number Pages:
14p.
Author(s): Gaspar, L. A.; Teixeira, P.; Didier, E.
: Revista Ocean Engineering
Editor: Elsevier
Volume:
Volume 201.
Keywords: Volume of fluid; Finite volume method; Numerical simulation; Oscillating water column device; Wave energy
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Numerical analysis of the response of an onshore oscillating water column wave energy converter to random waves
The main objective of this study is to investigate differences of random incident waves from regular ones in performance of wave energy converters (WEC). A numerical analysis of an onshore oscillating water column (OWC) WEC is carried out by means of the FLUENT® software, which is based on Reynolds - Averaged Navier-Stokes equations. Analyses of the efficiency of an onshore OWC device with similar characteristics of the Pico
Year: 2020
Number Pages:
12p.
Author(s): Teixeira, P. R. F.; Didier, E.
: Revista Energy
Editor: Elsevier
Volume:
Volume 220.
Keywords: Irregular/Random waves; RANS-VoF; Wells turbine; Oscillating water column; Wave energy
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O papel da engenharia na proteção do território e das suas gentes
Atualmente, mais importante que assegurar a resistência de um aglomerado urbano a um eventual invasor, importa garantir a sobrevivência a catástrofes naturais das infraestruturas críticas que garantem a salubridade das condições de vida nesse aglomerado, a mobilidade dos habitantes e o abastecimento de bens essenciais. Em rigor, face ao carater aleatório destas solicitações, pretende-se que, uma vez terminadas essas solicitações extremas, eventuais estragos causados pelas mesmas não impeçam o restabelecimento, em tempo útil, das atividades normais da população. Nesta comunicação apresentam-se ferramentas e procedimentos para avaliação do risco associado a infraestruturas críticas com um viés para o controlo de cheias urbanas e de infraestruturas de transporte marítimo.
Year: 2020
Number Pages:
201-221pp.
Author(s): Santos, J. A.; Pinheiro, L.; Fortes, C. J. E. M.
: Madeira Região Resiliente. Aprender com o Passado. Série Estudos Cindínicos
Editor: RISCOS - Associação Portuguesa de Riscos, Prevenção e Segurança
Volume:
Volume 9 (2020).
Keywords: Avaliação do risco; Resiliência; Infraestruturas críticas
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Sines breakwater harbour: the OSOM+ monitoring program
The current program of Systematic Observation of Maritime Works (OSOM+), under development at the National Laboratory for Civil Engineering (LNEC), is essentially applied to rubble mound breakwaters. The OSOM
Year: 2020
Number Pages:
49-57pp.
Author(s): Fortes, C. J. E. M.; Capitão, R.; Lemos, R.; Neves, M. G.; Silva, L. G.; Henriques, M. J.; Martins, T.
: Italian Journal of Engineering Geology and Environment
Editor: Sapienza Università Editrice
Volume:
1 (2020).
Keywords: Drone; Visual observations; Maintenance; Monitoring; Rubble mound breakwaters
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The HIDRALERTA system: Application to the ports of Madalena do Pico and S. Roque do Pico, Azores
HIDRALERTA is a forecast and early warning system for coastal and port regions capable of predicting emergency situations, as well as carrying out risk assessment. The system concentrates on evaluating wave overtopping and flooding scenarios. It uses offshore sea-wave and wind forecast data, as well as tide data, as input to determine wave overtopping at specific locations. The calculation of the mean overtopping discharge over a structure is made through artificial neural network (ANN) tools and/or empirical formulae, which are able to define the spatial distribution of the flow behind the structure.The HIDRALERTA system is composed of four modules developed in Open Source Web Technology, mainly using the Python Language. The Warning System can be configured and adapted for specific scenarios. The system has been successfully tested for the Port and Bay of Praia da Vitória, Terceira Island, Azores, Portugal, and is now under development and being implemented at the ports of Madalena do Pico and S. Roque do Pico.This paper describes the work carried out to date on the system and its application to these two ports in the Pico Island, Azores.
Year: 2020
Number Pages:
10p.
Author(s): Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Pinheiro, L.; Poseiro, P.; Serrazina, V.; Mendonça, A. C.; SMITHERS, N; SANTOS, M.I.; Barateiro, J.; Azevedo, E. B.; SALVADOR, M.; Reis, F.
: Revista Aquatic Ecosystem Health & Management
Editor: Taylor & Francis
Keywords: Warning system; Flooding; Wave overtopping
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3-D scale model study of wave run-up, overtopping and damage in a rubble-mound breakwater subject to oblique extreme wave conditions
A set of scale-model tests carried out to enlarge the range of wave steepness values analysed in run-up, overtopping and armour layer stability studies, focusing on oblique extreme wave conditions and on their effects on a gentler slope breakwater
Year: 2019
Number Pages:
32-41pp..
Author(s): Santos, J. A.; Pedro, F.; Coimbra, M.; Figuero, A.; Fortes, C. J. E. M.; Sande, J.; Körner, M.; Lemos, R.; Bornschein, A.; Weimper, J.; van den Bos, J.; Dost, B.; Hofland, B.; Carvalho, R.; Alvarellos
: Defect and Diffusion Forum
Editor: Trans Tech Publications Ltd, Switzerland
Volume:
Volume 396.
Keywords: Instrumentation; 3D-Wave basin; Physical modelling
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A numerical tool for modelling oscillating wave surge converter with nonlinear mechanical constraints
Mechanical constraints have a non-negligible influence in the motion of oscillating wave surge converter (OWSC) devices. The key novelty of this paper is a numerical simulation tool for OWSCs that does not neglect or significantly compromise mechanical constraints such as hydraulic power take-off (PTO) system, revolute joints and frictional contacts among components. The paper is aimed at presenting the key components of the numerical simulation tool and at validating it with laboratory data featuring an OWSC with mechanical constraints under regular and irregular waves. It is based on the implementation of the multibody solver of Project Chrono under the Smoothed Particle Hydrodynamics (SPH) model of DualSPHysics, where the SPH solver resolves the interaction between wave and flap and the multibody solver resolves the interaction between flap and mechanical constraints. Comparison between numerical results and experimental data show that the numerical simulation tool properly predicts the dynamics of the OWSC. Furthermore, in what concerns hydrodynamics of the near-flap flow, the computed and measured free-surface elevations and phase-averaged flow field show reasonable agreement. Once properly validated, the numerical simulation tool is then applied to study the influence of several mechanical constraints, PTO damping characteristics and flap inertia on the hydrodynamic of the OWSC. The viability of OWSC design solutions based on the developed numerical simulation tool is emphasised, in view of its performance in the test cases to which it was subjected.
Year: 2019
Number Pages:
2024-2043pp.
Author(s): Brito, M.; R. Canelas; García-Feal, O.; Domínguez, J. M.; Crespo, A. C.; Ferreira, R. L.; Neves, M. G.; Teixeira, L.
: Renewable Energy
Editor: Elsevier
Volume:
146.
Keywords: Wave-structure interaction; Wave energy; Mechanical constraints; Oscillating wave surge converter (OWSC); Smoothed particle hydrodynamics (SPH); Numerical modelling
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Comunicação
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Simulation of wave overtopping of a rubble mound breakwater using SWASH
An investigation of the applicability of the SWASH model for wave overtopping estimation of a porous structure with a recurved wall was carried out. The results demonstrate the capability of SWASH to predict with good accuracy the mean overtopping discharges when compared to data from physical model tests. Also, detailed validation of the instantaneous wave overtopping shows a reasonable agreement.Whilst free surface is well represented without considering several parametrizations, even for one-layer mode, wave overtopping is very sensitive to any variation in numerical and physical parameters. Wave overtopping simulations are very sensitive to the non-linear Forchheimer coefficient,
Year: 2017
Number Pages:
13p.
Author(s): Poseiro, P.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Suzuki , T.
Editor: Artes Gráficas J. Martínez, S.L
Keywords: Praia da Vitória harbour; Rubble mound breakwaters; SWASH model; Overtopping
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Survey of a two-dimensional scale model of a rubble-mound breakwater using different stereo-photogrammetric techniques
This paper focus on the study of different methodologies for surveying two-dimensional scale models of a rubble mound breakwaters.Tests were conducted in one of the LNEC
Year: 2017
Number Pages:
245-252pp.
Author(s): Lemos, R.; Henriques, M. J.; Muralha, A.; Jónatas, R.; Fortes, C. J. E. M.; Capitão, R.
Editor: LNEC
Keywords: Photogrammetry; 3D surface models; Damage evolution; Scale model tests; Maritime structures
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SWAMS ALERT
Este artigo descreve os mais recentes desenvolvimentos do sistema SWAMS ALERT. O sistema consiste em quatro módulos: I - Características da agitação marítima; II - Navegação em áreas portuárias; III - Avaliação de Risco e IV - Sistema de Alerta. O sistema está a ser desenvolvido e implementado numa plataforma web totalmente interativa e amigável.O sistema SWAMS ALERT usa as características da agitação marítima medidas ou previstas para determinar os seus efeitos em termos de movimento vertical excessivo de uma embarcação em manobras que entra ou sai de uma bacia portuária ou em termos de forças em amarras e defensas, bem como de movimentos de um navio amarrado. Para isso, o sistema utiliza um conjunto de modelos numéricos. A comparação dos valores calculados das variáveis relevantes com valores máximos pré-definidos permite a avaliação em tempo real de possíveis situações de emergência ou quando a segurança das operações portuárias estiver em risco e emitir avisos às autoridades competentes; e ainda a construção de mapas de risco, considerando longas séries temporais de ondas de mar medidas ou previstas ou cenários predefinidos associados a alterações climáticas ou eventos extremos.Ilustra-se a aplicação deste sistema ao porto da Praia da Vitória.
Year: 2017
Number Pages:
16p.
Author(s): Pinheiro, L.; Lopes, P.; Poseiro, P.; Fortes, C. J. E. M.; Santos, J. A.
Editor: APRH
Keywords: Agitação marítima; Amarrações; Alerta; Previsão; Navios; Risco
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The conundrum of specifying very low wave overtopping discharges
The design of certain seawalls / breakwaters has often been required to achieve very low target overtopping discharges when these structures protect vulnerable infrastructure or activities. The balance between economically viable protection and performance requirements is often difficult to achieve without good knowledge on low overtopping. The paucity of data in this space and the high uncertainties associated with existing methods, increase the challenge. The occurrence of a low number of overtopping waves has the consequence that any test results are substantially more affected by the inherent variation of random waves, therefore more uncertain. The physical model test results presented hereafter were successful in obtaining low to very low overtopping discharge data. For low / very low overtopping, these test data present considerable scatter relative to the latest empirical prediction. A number of repetitions was performed for conditions giving very low overtopping discharges, which illustrated the inherent uncertainty associated with low overtopping.
Year: 2017
Number Pages:
10p.
Author(s): Silva, E.; Allsop, W.; Riva, R.; Rosa-Santos, P.; Taveira-Pinto, F.; Mendonça, A. C.; Reis, M. T. L. G. V.
Editor: ICE - Institution of Civil Engineers
Keywords: Physical experiments; Breakwaters; Overtopping
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Towards a mobile monitoring tool for coastal structures inspection: the Ericeira rubble-mound breakwater test case
Rubble mound breakwaters (RMB) are the most common maritime structures in Portugal. Their main goal is to reduce the action of waves on the sheltered area of the structure to achieve safety conditions for ships, people and harbour activities.To account and define the need for maintenance or repair works on such structures, it is necessary to evaluate its evolution along its expected lifetime. To predict damages that may occur in those structures and evaluate its importance in terms of structural safety and functionality, it is therefore of utmost importance to follow a monitoring program on such structures. For that purpose, a monitoring mobile tool to be used onsite by the observer would be very useful, adding in this way more efficiency to the existing traditional monitoring techniques used nowadays at LNEC, where visual, systematic, observations are made to attain relevant qualitative evaluation of those structures.Hence, a responsive WebGIS system was developed (Maia et al., 2017) for assisting the observation campaigns, enabling the introduction of photos and videos, their accurate georeferencing, the automatic evaluation of the current, and evolutive, structural state of the structure, and also the checking of physical characteristics of the structure and materials.Besides briefly describing the monitoring tool, this paper focuses primarily on demonstrating its application to a real case scenario of an inspection campaign to the RMB of Ericeira,Portugal, on the 20th of April 2017.
Year: 2017
Number Pages:
221-228pp.
Author(s): Capitão, R.; Maia, A.; Lemos, R.; Rodrigues, A.; Fortes, C. J. E. M.
Editor: LNEC
Keywords: Risk assessment; Mobile app; WebGIS; Inspection; Monitoring; Breakwaters
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A aplicação ANOSOM_SIG como ferramenta de gestão de risco em estruturas de proteção costeira e portuária
O LNEC tem implementado, desde 1986, um programa designado por OSOM (Observação Sistemática de Obras Marítimas) para quebra-mares de talude localizados em Portugal continental. Para armazenamento, consulta e análise da informação que vai sendo recolhida sobre os diferentes quebramares no programa OSOM, desenvolveu-se no LNEC a aplicação ANOSOM (Análise de Observação Sistemática de Obras Marítimas), a qual tem vindo a ser alvo de diversas atualizações, inclusivamente o manuseamento de nuvens de pontos provenientes de levantamentos dos quebra-mares com sistema de sondador multifeixe e/ou com a ajuda de UAV. Presentemente está em desenvolvimento uma aplicação Web a, ANOSOM_SIG, a qual virá a ser utilizada como interface da base de dados ANOSOM que inclui as funcionalidades de um Sistema de Informação Geográfica (SIG), transformando-se assim, numa ferramenta de gestão de risco em estruturas de proteção costeira e portuária.O objetivo desta comunicação é descrever a aplicação ANOSOM_SIG, bem como as suas funcionalidades até agora implementadas, apresentando alguns exemplos de aplicação.
Year: 2016
Number Pages:
409-412pp.
Author(s): Lemos, R.; Silva, J.; Fortes, C. J. E. M.; Reis, M. T.; Lopes, P.
Editor: Instituto Hidrográfico
Keywords: WebSIG; Gestão de risco; Levantamentos; Observação sistemática; Quebra-mares de talude
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A new application of the nonlinear shallow water numerical model AMAZON to study OWC in vertical breakwaters
This paper ilustrates lhe application of a non-linear shallow water numerical model, AMAZON, to study Oscillating Water Column Wave Energy Converters (OWC-WEC) inregrated in vertical breakwaters. This application has been performed within the scope of the research project DITOWEC - Development of an Integrated Tool for Numerical Modelling of Oscillating Water Cohumn Wave Energy Converters Integrated in Vertical Breakwaters. The main objective of DITOWEC is the development of an innovative integrated tool for numerical modeling of wave propagation from offshore to nearshore, of wave-structure interaction and of the complex nonlinear hydrodynamic and aerodynamic phenomena that occur in an OWC-WEC. This development is supported by field data from PICO power plant (Azores) and from two-dimensional experimental data, from physical model tests carried out at LNEC, which are used here for AMAZON calibration/validation. A sensitivity analysis on AMAZON parameters (grid resolution and momentum adjustment factor at vertical barrier) is presented and discussed, centered on wave height obtained near and inside lhe water chamber, amplification factor and phase lag. The obtained AMAZON results are encouraging though more tests are required for different water depths, vertical openings and incoming wave periods, allowing further calibration and validation of the momentum adjustment factor.
Year: 2016
Number Pages:
509-520pp.
Author(s): Reis, M. T. L. G. V.; Mestre, R.; Neves, M. G.; Hu, K.; Dias, J.; Mendonça, A. C.; Didier, E.; Fortes, C. J. E. M.
Editor: EdiBios
Keywords: Wave energy converter; Vertical breakwater; Numerical modelling; Oscillating water column; Nonlinear shallow water
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Análise de dados de agitação num ponto da costa portuguesa. Implicações para o dimensionamento de quebra-mares verticais
Com base em 10 anos de dados de temporais medidos na boía ondógrafo de Sines entre os anos 2001 e 2010, analisaram-se as características de diversos parâmetros da agitação, entre as quais as alturas de onda (significativa e máxima), o período médio e a direção de agitação. Em particular estudou-se a relação entre alturas de onda máxima e alturas de onda significativa durante condições de temporal, compararam-se as relações encontradas com as propostas na literatura e usualmente aplicadas no dimensionamento de quebra-mares verticais, e analisou-se a sua influência na estabilidade dessas estruturas. Verificou-se que os coeficientes de segurança calculados com base em valores de altura máxima registada são inferiores aos calculados com a relação proposta na literatura.
Year: 2016
Number Pages:
97-100pp.
Author(s): Ferreira, R.; Neves, M. G.; Oliveira, T.; Esteves, R.
Editor: Instituto Hidrográfico
Keywords: Quebra-mar vertical; Sines; Dimensionamento; Boía ondógrafo; Altura de onda significativa; Altura de onda máxima
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Análise numérica do desempenho de dois dispositivos de aproveitamento de energia das ondas de tipo coluna de água oscilante
O dispositivo de aproveitamento de energia das ondas de tipo coluna de água oscilante (CAO) é um sistema que foi desenvolvido há já algumas décadas. Em condições de agitação marítima forte, pode ocorrer entrada de ar na câmara-de-ar do dispositivo, pela abertura submersa, comprometendo assim o seu rendimento. A colocação de uma parede vertical submersa, em frente ao dispositivo (UCAO), permite evitar este problema, mas altera o seu desempenho. Neste artigo, o modelo SPH é utilizado para uma primeira análise comparativa da hidrodinâmica dos dois dispositivos. Verifica-se que o factor de amplificação é fortemente condicionado pela dimensão da abertura submersa, reduzindo-se para uma abertura pequena, particularmente para os períodos de onda mais baixos. A amplitude da cava, na câmara de água e em frente ao dispositivo, é menor na configuração de UCAO que na CAO. É, assim, evidente que a UCAO reduz fortemente o risco de sucção de ar na câmara, embora reduza o factor de amplificação, quando comparada com a CAO.
Year: 2016
Number Pages:
419-422pp.
Author(s): Didier, E.; Teixeira, P.; Neves, M. G.
Editor: Instituto Hidrográfico
Keywords: Smoothed particle hydrodynamics; UCAO; CAO; Energia das ondas
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Application of stereo photogrammetry to physical scale model tests with mobile beds
The phenomenon of scour in the vicinity of coastal and harbour protection structures, wind farms, offshore platforms and marine outfalls is one of the causes associated with its collapse. During the design of such structures, the prediction of the maximum erosion depth located in the vicinity of the structure is of utmost importance, requiring, frequently, a validation by scale-model tests. The objective of this study is to validate the use of stereo photogrammetry in such tests. To accomplish this goal, two sets of tests were conducted: A stereo photogrammetric survey of a well-known shape molded in a sand box was carried out in order to infer on the accuracy of the technique when applied to a sand bed. The second set of tests consisted on the survey of the scour around a pile, using the stereo photogrammetric method as well as a bed profiler in order to compare the results obtained with both methods.
Year: 2016
Number Pages:
12p.
Author(s): Pedro, F.; Lemos, R.; Fortes, C. J. E. M.; Santos, J. A.
Editor: LNEC
Keywords: Stereo photogrammetry; Scale model tests; Scour
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Capítulo de Livro
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Multi-functional artificial reefs for coastal protection
N/A
Year: 2009
Number Pages:
153-210 pp.
Author(s): Voorde, M.; Antunes do Carmo, J.; Neves, M. G.
Editor: Ch. A. Hudspeth, T. E. Reeve
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Tese de Doutoramento
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Trapped-mode propagation along irregular coasts
N/A
Year: 1999
Number Pages:
159 p.
Author(s): Santos, J. A.
Editor: ******
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Probabilistic Assessment of the Safety of Coastal Structures
N/A
Year: 1998
Number Pages:
594 p.
Author(s): Reis, M. T.
Editor: ******
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Unsteady Nearshore Currents on Longshore Varying Topographies
N/A
Year: 1998
Number Pages:
346 p.
Author(s): Sancho, F. E.
Editor: ******
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Simulação da agitação irregular. Técnicas matemáticas
N/A
Year: 1973
Author(s): Carvalho, M. M.
Editor: ******
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Relatório Científico
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Porto de pesca de S. Miguel - Açores. Ensaios bidimensionais de estabilidade e galgamentos dos perfis do molhe de protecção
N/A
Year: 1992
Author(s): Neves, G.; Silva, L. G.
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Valores Extremos da Agitação Marítima. Síntese dos dados de temporais ocorridos em Portugal Continental.
N/A
Year: 1992
Author(s): Capitão, R.; Marcos Rita, M.; Baptista, J. M.; Carvalho, M. M.
Editor: LNEC
Keywords: Agitação marítima; Portugal continental
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Valores extremos da agitação marítima. Figueira da Foz - Tratamento local dos dados existentes,
N/A
Year: 1992
Author(s): Carvalho, M. M.
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Agitação marítima na costa Portuguesa. Dados de base. Observações efectuadas na Figueira da Foz.
N/A
Year: 1991
Author(s): Santos, J. A.
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Ensaios bidimensionais de estabilidade e galgamentos do perfil de reparação do molhe de abrigo do porto da Baleeira (2.ª Fase).
N/A
Year: 1991
Author(s): Silva, L. G.
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Ensaios bidimensionais de estabilidade e galgamentos do perfil de reparação do molhe de protecção do porto da Baleeira.
N/A
Year: 1991
Author(s): Silva, L. G.
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Ensaios em modelo reduzido do molhe do Funchal. Ensaios bidimensionais de estabilidade e galgamentos.
N/A
Year: 1991
Author(s): Silva, L. G.
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Ensaios em modelo reduzido do molhe do Funchal. Ensaios tridimensionais da cabeça do molhe.
N/A
Year: 1991
Author(s): Silva, L. G.
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Estudo do reforço do molhe de Vila do Porto. Ensaios bidimensionais de estabilidade e galgamentos.
N/A
Year: 1991
Author(s): Silva, L. G.
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Estudo em modelo reduzido do reforço do molhe do porto da Horta. Ensaios tridimensionais de estabilidade e galgamentos.
N/A
Year: 1991
Author(s): Silva, L. G.
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Outro
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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
Year: 2023
Author(s): 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
Year: 2019
Author(s): 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.
Year: 2016
Author(s): 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
Year: 2016
Author(s): 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
Year: 2010
Number Pages:
1.
Author(s): 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
Year: 2005
Author(s): Reis, M. T. L. G. V.
Editor: ******
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Guidelines and Recommendations for River Information Services - PIANC
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Year: 2004
Author(s): J.A Covas
Editor: ******
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Porto Santo Island. Wave Characterization and propagation. poster apresentado ao International Coastal Symposium (ICS 04)
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Year: 2004
Author(s): Fortes, C. J. E. M.
Editor: ******
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Probabilistic Assessment of Hazards from Overtopping of Seawalls in Urban Environments: Annual report of Post-Doctoral Research.
N/A
Year: 2004
Author(s): Reis, M. T. L. G. V.
Editor: ******
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