Papers
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Analysis of forces on a submarine outfall by a RANS-VoF numerical wave tank
Knowledge of forces due to the action of waves on submarine outfalls composed by a pipe and stabilizing concrete weights, considering the wave propagation direction to the outfalls, is essential to their design. 3D numerical models based on RANS-VoF (Reynolds-Average-Navier-Stokes Volume-of-Fluid) are able to estimate forces on the pipe and weights. The present study aims to simulate a submarine outfall with stabilizing concrete weights at 1:15 scale which was previously tested in the 3D Shallow Water Basin at the Danish Hydraulics Institute (DHI) to analyse the influence of the direction of the incident wave and the distance from the pipe to the bottom on the outfall forces. In this study, numerical results are compared with experimental ones for waves with four different amplitudes and with wave incidence perpendicular to the outfall. The use of k-
Year: 2019
Number Pages:
50-59pp.
Author(s): Didier, E.; Neves, M. G.; Teixeira, P.
: Defect and Diffusion Forum
Editor: Trans Tech Publications Ltd, Switzerland
Volume:
Vol. 396.
Keywords: Numerical wave tank; RANS-VoF; Forces; Submarine outfalls
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Damage progression in rubble-mound breakwaters scale model tests, under a climate change storm sequence
This paper describes the two-dimensional (2D) physical model tests of a rock armor breakwater, performed at LNEC´s experimental facilities, under the framework of the HYDRALAB+ project. The aim of the present work was to evaluate damage evolution under future climate change scenarios, by using different damage evaluation techniques. The tested wave conditions simulated a storm sequence where two water levels (low water and high water) were considered, as well as an increase of the wave height. The water levels and the wave heights were chosen to simulate extreme events forecasted on climate change scenarios. Damage evaluation was based on the traditional counting method and on stereo-photogrammetric techniques. Test results are presented in terms of the damage parameter S and in terms of the percentage of removed armor units. The analysis is focused on the damage progression during the scale model tests, for the imposed storm sequence. The damage presents an oscillating behavior with two main damage areas corresponding to the active zones for each level, due to the variation of the water level between low-water and high-water. This behavior differs significantly from that found for the common storm sequences usually tested, where the water level does not change. Both measuring techniques lead to an intermediate damage of the cross-section breakwater. However, the damage parameter assessment with the stereo-photogrammetric technique allows a more versatile evaluation, since it is possible to characterize damage in representative zones of the cross-section
Year: 2019
Author(s): Fortes, C. J. E. M.; Lemos, R.; Mendonça, A. C.; Reis, M. T. L. G. V.
: Journal of Research on Engineering Structures and Materials (RESM)
Editor: MIM Research Group
Volume:
Vol. 5 Iss. 4.
Keywords: Stereo-photogrammetric techniques; Climate change; Rubble-mound breakwaters; Damage progression
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Experimental investigation on the power capture of an oscillating wave surge converter in unidirectional waves
The aim of this paper is the experimental characterization of the capture width ratio (CWR) and response amplitude operator (RAO) of a 1:10 physical model of an oscillating wave surge converter (OWSC), under unidirectional regular and irregular waves. The effects of hydraulic power take-off (PTO) system are explicitly taken in consideration. A mathematical model is proposed to describe the PTO damping as a function of the angular velocity of the flap. The harmonic decomposition of free-surface elevation, angular velocity of the flap and pressure in the PTO system demonstrates that these signals are dominated by their linear component. However, the signals also present some important higher-order frequency components. To predict the CWR of the OWSC under irregular waves the nonlinear output frequency response functions are considered as the extension of the RAO to the nonlinear case. It is shown and discussed that the PTO system, wave frequency and height have a significant influence on the CWR and RAO. The RAO curve for irregular waves does not exhibit a well-defined peak, showing a limited variation in a broadband. A weak correlation between CWR and RAO was found, i.e., the maximum CWR does not occur for the maximum value of RAO.
Year: 2019
Number Pages:
975-992pp.
Author(s): Brito, M.; Ferreira, R. L.; Teixeira, L; Neves, M. G.; R. Canelas
: Renewable Energy
Editor: Elsevier
Volume:
Volume 151.
Keywords: Power take-off: PTO damping; Response amplitude operator: RAO; Capture width ratio: CWR; Oscillating wave surge converter: OWSC; Wave energy
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Measuring wave run-up, overtopping and damage of rubble-mound breakwaters in scale model tests
A set of scale-model tests was carried out at the wave basin of the Leibniz University Hannover to extend 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:
118-129pp.
Author(s): Santos, J. A.; Lemos, R.; Weimper, J.; Gronz, O.; Hofland, B.; Sande, J.; Pinheiro, L.; Spans, J.H.; Peña, E.; Reis, M. T. L. G. V.; Fortes, C. J. E. M.; Figuero, A.; Laiño, E.; Bornschein, A.; Kerpen
Editor: Hydralab+
Keywords: Rubble-mound breakwaters; Model tests; Overtopping; Wave run-up
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Numerical analysis of the interference between two elastically mounted cylinders in tandem subject to flows at low Reynolds numbers
Fluid-dynamic interference among cylindrical structures in arrays, frequently used in engineering, is of fundamental and practical interests since it may considerably change fluid-structure interactions and produce large fluctuating forces on structures that cause vibrations, lock-in and important motions. This paper aims to study the mutual interference between two circular cylinders in tandem arrangement, which is considered the simplest configuration of one array cylinders, elastically mounted in transversal direction and subject to a bi-dimensional uniform laminar flow at low Reynolds numbers. Both cylinders have the same diameter D and the center-to-center spacing is equal to L = 5.25D which corresponds to co-shedding regime. The academic numerical model Ifeinco, which is based on the finite element method and uses a partitioned scheme that considers two-way interaction of fluid flow and structure, has been employed to the analysis. Combinations of upstream and downstream stationary and elastically mounted cylinders are investigated for Reynolds number range from 90 to 140. Differences of flow behaviors drag and lift forces and resonance between single cylinder and cylinders in tandem arrangement were found. Mutual and respective influence of upstream cylinder motion on the downstream cylinder and vice-versa are analyzed. Results show that, in some engineering studies, the consideration of the flexibility of cylindrical structures in arrays is fundamental since it influences significantly the interference between cylinders, mainly the magnitude and direction of forces and characteristics of the resonance range, and, consequently, structural and dynamical behaviors.
Year: 2019
Number Pages:
11p.
Author(s): Teixeira, P.; Rechsteiner, P.; Didier, E.
: Journal of the Brazilian Society of Mechanical Sciences and Engineering
Editor: Springer
Volume:
Vol. 41.
Keywords: Finite element method; Vortex-induced vibration; Wake interference; Tandem arrangement; Circular cylinders
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Observação e monitorização de obras marítimas com a nova metodologia OSOM+
This paper describes a programme under the responsibility of the National Laboratory for Civil Engineering (LNEC), Portugal for the systematic observation and monitoring of maritime works, termed OSOM+, which has been applied to an extensive number of maritime structures on the Portuguese mainland coast and abroad. The OSOM+ programme comprises the following four main components for each structure: a) Periodic visual inspections by a trained technician; b) Periodic aerial inspections using a UAV/drone; c) The ANOSOM-GIS database, to store and/or query obtained information, as well as to diagnose present, evolution and risk conditions; and d) A mobile, portable, application, for real-time input and visualization of the ANOSOM-GIS database information.This recently updated methodology encompasses a number of tools whose functionalities are illustrated in this paper with an application to a case study: the Ericeira
Year: 2019
Number Pages:
22p.
Author(s): Fortes, C. J. E. M.; Capitão, R.; Henriques, M. J.; Lemos, R.; Neves, M. G.; Reis, M. T. L. G. V.; Silva, L. G.
: Revista Mundi, Engenharia, Tecnologia e Gestão
Editor: Instituto Federal do Paraná
Volume:
v.4, n.2.
Keywords: Ericeira
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A methodology to determine the optimal size of a wells turbine in an oscillating water column device by using coupled hydro-aerodynamic models
This paper describes a methodology to determine the optimal size of a Wells turbine to be used in an OWC device taking into account hydro-aerodynamic coupling, performance curves of the turbine and air pressure control by a relief valve. The proposed model, named turbine diameter optimization (TDO) model, considers the movement of the water surface inside the OWC chamber as a piston movement in response to the hydrodynamic forces from the incoming waves. The aerodynamic is based on the first law of thermodynamics applied to the air column of the chamber. The power-pressure curve of the turbine and the air pressure control by relief valve are implemented in the model to determine the turbine power output for several regular incident waves. The TDO model is initially calibrated by a numerical model based on Reynolds-Average-Navier-Stokes (RANS) equations for each wave component of an expected sea state distribution. Thereafter, the power output generated by turbines of several sizes is calculated with lower computational cost (few minutes) in comparison with RANS based models (thousands of hours) in a personal computer. This developed methodology is an important support to the process of turbine sizing for an OWC device for an expected sea state distribution.
Year: 2018
Number Pages:
9-18pp.
Author(s): Torres, F.; Teixeira, P.; Didier, E.
: Revista Renewable Energy
Editor: Elsevier
Volume:
Vol. 121.
Keywords: Air pressure control; Turbine sizing; Oscillating water column; Wave energy
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An integrated tool for modelling oscillating water column (OWC) wave energy converters (WEC) in vertical breakwaters
This paper describes the preliminary developments of an innovative integrated tool for the numerical modelling of oscillating water column (OWC) wave energy converters (WEC) integrated in vertical breakwaters. The main purpose of the tool is the numerical modelling of wave propagation from offshore to nearshore, wave-structure interaction, and the complex nonlinear hydrodynamic and aerodynamic phenomena that occur in OWC-WECs.The tool development and validation were supported by experimental data from physical model tests carried out in a wave flume at the Portuguese National Laboratory for Civil Engineering (LNEC). Prototype data were also available for the Pico OWC-WEC in the Azores, Portugal, monitored by the Portuguese Wave Energy Centre since 2005. Application of the tool for sea-wave characterization at the Azores archipelago and calculation of the corresponding wave power for a period of 10 years at various points around each island show that, in winter, there is good availability of wave energy in most quadrants of each island. In summer, the resource exploitation is only worthwhile on the north-west coasts of the islands. Physical and numerical modelling results for an OWC with a fully open chamber show good agreement between experimental data and numerical values for several incident wave conditions. The analysed results include the time series of the free-surface elevation at different locations, the time series of the mean free surface inside the water chamber, the amplification factors, the phase angles and the velocity vectors at the highest and the lowest positions of the mean free surface inside the chamber. The tool showed its potential to be useful in supporting ocean and coastal engineering projects due to its capacity to effectively reproduce the main phenomena involved in these types of studies.
Year: 2018
Number Pages:
198
Author(s): Mendonça, A. C.; Dias, J.; Didier, E.; Fortes, C. J. E. M.; Neves, M. G.; Reis, M. T. L. G. V.; Conde, J. M.; Poseiro, P.; Teixeira, P. R. F.
: Journal of Hydro-environment Research
Editor: Elsevier
Volume:
Vol. 19.
Keywords: Wave power; SWAN-URANS models; Nonlinear numerical modelling; Physical modelling; Wave-structure interaction; Oscillating water column (OWC) wave energy converter (WEC)
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Asymmetric copula
Joint statistical models for long-term wave climate are a key aspect of offshore wind engineering design. However, to find a joint model for sea-state characteristics is often difficult due to the complex nature of the wave climate and the physical constraints of seastates phenomena. The available records of wave heights and periods are often very asymmetric in their nature. This article presents a copula-based approach to obtain the joint cumulative distribution function of the significant wave heights and the up-crossing mean period. This study is based on 124-month hindcast data concerning Horns Rev 3 offshore wind farm. The extra-parametrization technique of symmetric copulas is implemented to account for the asymmetry present in the data. The analysis of the total sea, the wind-sea and primary swell components is performed separately. The results show that the extra-parametrization technique with pairwise copulas consistently provided a better goodness-of-fit when compared to symmetric copulas. Moreover, it is demonstrated that the separation of the total sea into its components does not always improve the extra-parametrized copula
Year: 2018
Number Pages:
304-334pp.
Author(s): Fazeres-Ferradosa, T.; Taveira-Pinto, F.; Vanem, E.; Reis, M. T. L. G. V.; Neves, L.
: Wind Engineering
Editor: Sage
Volume:
Vol. 42, No. 4.
Keywords: Asymmetry; Crámer
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Characterization of ship motions induced by wake waves
This paper analyses the hydrodynamic interaction between two ships, one stationary and the other navigating nearby, using physical and numerical modelling. The passing ship is a self-propelled scale model of the
Year: 2018
Number Pages:
547-555pp.
Author(s): Pedro, F.; Pinheiro, L.; Fortes, C. J. E. M.; Santos, J. A.; Hinostroza , M.
: Progress in Maritime Technology and Engineering
Editor: Taylor & Francis
Keywords: Wake waves; SWAMS; Ship motions
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Comunicação
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Wave Overtopping at Ericeira harbour.Validating SWASH and NN_OVERTOPPING2 estimations with video
The To-SEAlert project has the aim of increasing the efficiency, robustness and reliability of the HIDRALERTA system.
Year: 2022
Author(s): Zózimo, A. C.; Manz, A.; Garzon, J.L.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Capitão, R.; Taborda, R.; Silva, A.
Editor: 7as Jornadas de Engenharia Hidrográfica / 2as Jornadas Luso-Espanholas de Hidrografia
Keywords: wave overtopping; video-monitoring; To-SEAlert; HIDRALERTA; Early Warning System
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Wave-induced flooding risk assessment for the Development of Early Warning Systems
Communities can be vulnerable to wave-induced flooding and risk is expected with rising sea levels and population growth.
Year: 2022
Author(s): Garzon, J.L.; Ferreira, P.; Gomes, A.; Fortes, C. J. E. M.
Editor: IAHR
Keywords: Portugal; XBeach; Forecast and alert system; Risk assessment; Wave overtopping
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An estimation of the armour layer damage based on the eroded volume using a time of flight method
The assessment of damage evolution in scale model tests of rubble-mound breakwaters can be achieved by comparing eroded depths and volumes between consecutive surveys. Aiming to evaluate damage evolution on rubble-mound breakwater, scale model tests were recently conducted on the maritime hydraulic facilities of the National Laboratory for Civil Engineering. This paper focuses on the use of novel, non-intrusive survey methodologies such as the Time of Flight (ToF) principle technique. Damage evaluation is based on the comparison of point clouds obtained before and after each test series, enabling the extraction of profiles, the calculation of eroded depths and eroded volumes and the estimation of displaced units.
Year: 2021
Number Pages:
2p.
Author(s): Lemos, R.; Fortes, C. J. E. M.; Silva, L. G.; Pinheiro, L.
Editor: CNME2020
Keywords: Measuring techniques; 3D Surveying; Breakwater; Stability
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Análise de eventos de risco através de modelação numérica XBeach. Caso de Estudo - Costa da Caparica
Neste estudo recorre-se à modelação numérica para a simulação de eventos de galgamento, inundação e erosão costeira em zonas costeiras devido a ocorrência de tempestades. Esta metodologia está a ser estudada para o troço costeiro da Costa da Caparica, na área que compreende toda a extensão da estrutura de defesa aderente, para a tempestade Hércules/Christine. Nesta modelação numérica recorreram-se aos modelos numéricos SWAN e XBeach. Estes modelos foram utilizados para simular 96 h de forçamentos oceanográficos sobre a área de estudo, representando assim a tempestade entre os dias 3 e 7 de janeiro de 2014. Os resultados preliminares apontam para um subestima dos run-up consequência da parametrização do modelo e das características da batimetria considerada.
Year: 2021
Number Pages:
5p.
Author(s): Ferreira, A. M.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Garzon, J.L.
Editor: APRH
Keywords: Costa da Caparica; Agitação marítima; Run-up; Erosão; Galgamento; Riscos costeiros
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Assessment of potential locations for OWC instalation at the portuguese coast
This work aims to determine the exploitable wave energy resource at six potential sites, located in the Azores, Madeira and Sines. For that purpose, the third-generation wave model SWAN is used to estimate the sea-wave conditions over the last 40 years. Boundary conditions of the sea states and wind fields are provided by the climate reanalysis datasets ERA5. Using those results as inputs to the SWAN model, the sea-states were propagated shoreward, in order to estimate and analyse the wave conditions in the regions of interest. By combining the average energy flux per unit-length of wave front and the probability of occurrence of each sea state, the average exploitable annual energy per unit length of wave crest can be computed. The variability of this energy flux is analysed since it is of fundamental importance for the efficiency of the Wave Energy Converters (WEC).
Year: 2021
Number Pages:
4p.
Author(s): Anastas, G.; Pinheiro, L.; Fortes, C. J. E. M.; Santos, J. A.
Editor: APRH
Keywords: Exploitable energy; SWAN; Oscillating water column; Wave energy converter
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Avaliação do galgamento e espraiamento em quebra-mares de talude. O caso do porto da Ericeira
A avaliação do espraiamento e do galgamento em estruturas de proteção costeira e portuária é fundamental para o projeto de novas estruturas e na verificação da segurança de estruturas já existentes. A sua determinação tem como objetivos principais a definição da cota de coroamento da estrutura e o estabelecimento das condições de serviço dessa estrutura. Uma das metodologias mais utilizadas para a avaliação do espraiamento e do galgamento em estruturas marítimas é a modelação física. Nessa metodologia, são várias as técnicas que podem ser usadas para a avaliação desses fenómenos físicos. Neste âmbito, salientam-se o uso de sondas resistivas, de balança ou de imagens vídeo. Neste trabalho são apresentados os resultados de um estudo em modelo físico do espraiamento e galgamento da estrutura de proteção portuária do Porto da Ericeira para diferentes condições de agitação marítima. Comparam-se ainda várias técnicas de avaliação do espraiamento e do galgamento que foram utilizadas nesses ensaios em modelo físico para avaliar o seu desempenho.
Year: 2021
Number Pages:
2p.
Author(s): Fortes, C. J. E. M.; Lemos, R.; Santos, J. A.; Reis, M. T. L. G. V.
Editor: CNME2020
Keywords: Técnicas de medição; Estruturas marítimas; Galgamento; Espraiamento
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Comportamento de navios amarrados nos portos de São Roque e de Madalena do Pico durante as tempestades Lorenzo e Elsa
Neste trabalho apresentam-se os resultados de simulações numéricas do comportamento de um navio ferry amarrado nos dois portos da ilha do Pico, São Roque e Madalena, durante a passagem recente de duas grandes tempestades, nomeadamente o furacão Lorenzo entre 2 e 5 de outubro de 2019 e a depressão Elsa entre 19 e 22 de dezembro de 2019. No âmbito do projeto ECOMARPORT encontra-se em desenvolvimento um sistema de alerta para os riscos de navios amarrados nos referidos portos. Este sistema permite prever com 72 horas de antecedência os efeitos da agitação marítima em navios amarrados, mais concretamente, os seus movimentos e forças no sistema e amarração. A comparação destes resultados com os limites de segurança e de operacionalidade do terminal portuário permite avaliar o risco e tomar medidas preventivas. Os resultados obtidos em cada um dos portos permite comparar a eficácia da amarração proposta.
Year: 2021
Number Pages:
4p.
Author(s): Pinheiro, L.; Fortes, C. J. E. M.; Santos, J. A.
Editor: APRH
Keywords: Risco; Tempestade; Movimentos; Amarras; Navios
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Evolução do dano em modelo físico de um trecho do quebra-mar do porto da Ericeira
Para caracterizar a resposta de um trecho do quebra-mar de taludes do porto da Ericeira à agitação marítima nele incidente, realizaram-se no canal de ondas irregulares do LNEC um conjunto de ensaios em modelo físico bidimensional (2D) desse mesmo trecho. Nesta comunicação descreve-se a instalação experimental, bem como a metodologia utilizada no levantamento da envolvente do quebra-mar com vista à caracterização da evolução do dano. Esta metodologia baseou-se na avaliação da erosão do manto resistente utilizando o sensor de posição Kinect na obtenção de modelos tridimensionais de superfície. Apresentam-se ainda, alguns resultados relativos aos danos ocorridos início e no final de uma das três séries de ensaios realizadas.
Year: 2021
Number Pages:
2p.
Author(s): Lemos, R.; Santos, J. A.; Fortes, C. J. E. M.
Editor: CNME2020
Keywords: Sensor de posição; Quebra-mar; Evolução do dano
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Forças na superestrutura do quebra-mar da Ericiera: efeitos de possível subida do nível do mar
Esta comunicação apresenta uma análise dos coeficientes de segurança ao derrubamento e ao deslizamento na superestrutura do quebra-mar do Porto da Ericeira quando sujeito à acção de temporais, calculados com base nas forças obtidas por aplicação das fórmulas aplicáveis a este caso de estudo. Dada a previsão de subida do nível do mar na costa oeste portuguesa, é importante analisar a sua influência no agravamento das forças nas superestruturas destas estruturas e, consequentemente, na estabilidade da superestrutura. Para tal, foram calculadas as forças horizontais e verticais e respetivos coeficientes de segurança que se exercem na superestrutura do quebra-mar utilizando as condições de agitação no pé da estrutura obtidas de modelos de hindcast considerando os níveis de maré atuais e para uma projeção de subida do nível do mar de 5 mm/ano. A análise de resultados permitiu concluir que o efeito da subida do nível do mar reduz ligeiramente a segurança desta superestrutura para o cenário considerado, não sendo a alteração significativa.
Year: 2021
Number Pages:
5p.
Author(s): Pereira, F.; Neves, M. G.; Peña, E.; Maciñeira, E.; Reis, M. T. L. G. V.
Editor: APRH
Keywords: Estabilidade; Forças horizontais; Forças verticais
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Modelação física da resposta à agitação incidente de um trecho do quebra-mar do porto da Ericeira
Para caracterizar a resposta de um trecho do quebra-mar de taludes do porto da Ericeira à agitação marítima nele incidente, realizaram-se no canal de ondas irregulares do LNEC um conjunto de ensaios com um modelo reduzido desse mesmo trecho. Nesta comunicação descreve-se a instalação experimental, incluindo os diversos instrumentos utilizados para medir as séries temporais das várias grandezas de interesse e o programa de ensaios, apresentando-se as grandezas medidas num subconjunto dos ensaios considerado mais interessante. Nestas grandezas incluem-se a elevação da superfície livre associada à agitação incidente, o espraiamento ao longo do talude, o volume de água de água galgado, a pressão em vários pontos da superestrutura e a erosão do manto protetor.
Year: 2021
Number Pages:
5p.
Author(s): Santos, J. A.; Lemos, R.; Fortes, C. J. E. M.; Neves, M. G.; Pinheiro, L.; Pinto, M.; Sanches, C.; Gueifão, J.; Zózimo, A. C.
Editor: APRH
Keywords: Dano; Superestrutura; Galgamento; Espraiamento; Agitação marítima
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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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Síntese dos dados de agitação marítima existentes no LNEC.
N/A
Year: 1991
Author(s): Capitão, R.
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Valores extremos da agitação marítima. Viana do Castelo - Tratamento local dos dados existentes.
N/A
Year: 1991
Author(s): Carvalho, M. M.
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Aeroporto Internacional de Macau. 3 - Estudos de estabilidade. Relatório 3.1 - Ensaios de estabilidade e galgamentos do perfil da obra aderente de protecção ao terminal do aeroporto.
N/A
Year: 1990
Author(s): Silva, L. G.; Reis, M. T.
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Aeroporto Internacional de Macau. 3 - Estudos de estabilidade. Relatório 3.2 - Ensaio de estabilidade e galgamentos do perfil da protecção este do aterro da pista do aeroporto.
N/A
Year: 1990
Author(s): Silva, L. G.; Reis, M. T.
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Aeroporto Internacional de Macau. Comentários ao documento do MIAC 'Design water levels and return periods of extreme events'.
N/A
Year: 1990
Author(s): Carvalho, M. M.
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Aeroporto Internacional de Macau. Comentários aos documentos anexos aos ofícios do LECM n.º 103 de 90.02.10 e n.º 151 de 90.02.17.
N/A
Year: 1990
Author(s): Covas, J. A.; Carvalho, M. M.; Costa, R. G.; Silva, L. G.
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Aeroporto Internacional de Macau. Estudos de agitação marítima. Relatório 2.4 - Considerações suplementares sobre níveis do mar e alturas de onda.
N/A
Year: 1990
Author(s): Carvalho, M. M.
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Aeroporto Internacional de Macau. Projecto do modelo físico hidráulico dos estudos de agitação marítima.
N/A
Year: 1990
Author(s): Covas, J. A.; Marcos Rita, M.; Silva, L. G.; Fortes, C. J. E. M.
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Ajustamento gráfico de distribuições.
N/A
Year: 1990
Author(s): Carvalho, M. M.; Capitão, R.
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As Provas de Governo e Manobra do N/T "Bornes". Relatório Final
N/A
Year: 1990
Author(s): Santos, J. A.; Marcos Rita, M.; Baptista, J. M.
Editor: LNEC
Keywords: Bornes
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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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