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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%
Year: 2024
Number Pages:
1-15pp.
Author(s): Garzon, J.L.; Ferreira, Ó.; PLOMARITIS, T.A.; Zózimo, A. C.; Fortes, C. J. E. M.; Pinheiro, L.
: Coastal Engineering
Editor: Elsevier
Volume:
Vol 189 (104460).
Keywords: HIDRALERTA; Sandy beaches; Bayesian networks; Numerical modeling; Prediction system
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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.
Year: 2024
Number Pages:
16p..
Author(s): Gadelho, J.; REZANEJAD, K.; Guedes Soares, C.; Santos, J. A.; Anastas, G.; Fortes, C. J. E. M.
: Ocean Engineering
Editor: Elsevier
Volume:
Volume 300 (117240).
Keywords: Reflection coefficients; Efficiency improvement; Breakwater; Experiments; Oscillating water column
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Numerical analysis of 3D hydrodynamics and performance of an array of oscillating water column wave energy converters integrated into a vertical breakwater
Performance and hydrodynamics of an array of Oscillating Water Column (OWC) Wave Energy Converter (WEC) integrated into a vertical breakwater is studied. The FLUENT® software, in which the numerical model is based on the Reynolds-Averaged Navier-Stokes equations and the Volume of Fluid method for free surface flow modeling, is used in a 3D numerical wave tank. Three vertical breakwater configurations subject to the action of incident regular waves with periods from 6 to 12 s are studied: normal breakwater, with vertical walls parallel to the direction along the breakwater length; and two novel breakwater geometries, partially and fully convergent breakwaters, whose converging vertical walls are inclined
Year: 2024
Number Pages:
20p..
Author(s): Didier, E.; Teixeira, P.
: Revista Renewable Energy
Editor: Elsevier
Volume:
Vol. 225 (120297).
Keywords: 3D RANS-VoF numerical wave tank; Efficiency; Vertical breakwater; Oscillating water column; Array of wave energy converters
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A RANS-based Numerical Model to Simulate Overtopping-type Wave Energy Converters Integrated into Breakwaters
This study aims to validate a numerical model based on Reynolds-averaged Navier
Year: 2023
Number Pages:
420
Author(s): Didier, E.; Teixeira, P.
: International Journal of Offshore and Polar Engineering
Editor: IJOPE
Volume:
Vol 33 Nº 4.
Keywords: Turbulence models; Numerical wave flume; RANS; Wave energy; Overtopping wave energy converter
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An Early Warning System for Coastal Risks Assessment
Storms impacting sandy coastal areas produce hazards such as erosion and overwash that, in turn, promote risk to life and property damage in occupied areas. Coastal damage and risks willincrease in the future not only in association with climate change but also due to the growinghuman occupation in coastal areas (van Dongeren et al., 2018). Since the threatened coastal areas are often densely populated, there is a need to implement measures to prevent risks. One of such measures is the use of Early Warning Systems (EWS) that anticipate expected risks and, therefore, work as management tools to minimize or avoid disaster. This work presents the basis of an EWS prototype to alert about the potential consequences of overwash/overtopping and erosion induced by storms, in coastal areas.
Year: 2023
Author(s): Ferreira, Ó.; Garzon, J.L.; Ferreira, A. M.; Zózimo, A. C.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.
Editor: World Scientific
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Conceptual and quantitative categorization of wave
Beaches combined with sloping structures are frequently the frst element of defense to protect urban areas from the impact of extreme coastal fooding events. However, these structures are rarely designed for null wave overtopping discharges, accepting that waves can pass above the crest and threat exposed elements in hinterland areas, such as pedestrians, urban elements and buildings, and vehicles. To reduce risks, Early Warning Systems (EWSs) can be used to anticipate and minimize the impacts of fooding episodes on those elements. A key aspect of these systems is the defnition of non-admissible discharge levels that trigger signifcant impacts. However, large discrepancies in defning these discharge levels and the associated impacts are found among the existing methods to assess foodings. Due to the lack of standardization, a new conceptual and quantitative four-level (from no-impact to high-impact) categorization of food warnings (EW-Coast) is proposed. EW-Coast integrates and unifes previous methods and builds on them by incorporating feld-based information. Thus, the new categorization successfully predicted the impact level on 70%, 82%, and 85% of the overtopping episodes afecting pedestrians, urban elements and buildings, and vehicles, respectively. This demonstrates its suitability to support EWSs in areas vulnerable to wave-induced fooding.
Year: 2023
Author(s): Garzon, J.L.; Ferreira, O.; Reis, M. T. L. G. V.; Ferreira, A. M.; Fortes, C. J. E. M.; Zózimo, A. C.
: Scientific Reports
Editor: Communications Engineering
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Damage Evolution in Physical Scale Model Tests of a Stretch of the Breakwater of Peniche Harbour.
During physical scale model tests of rubble mound breakwaters, the assessment of the eroded volume of the armour layer subjected to incident sea waves can be determined from consecutive surveys of the surface of the armour layer after each test run. This enables one to assess the damage level of the struc ture by comparing erosion profiles and by the eroded volume between consecutive surveys of the tested section. The present study aimed to evaluate the damage evolu tion of a section of the Peniche harbour west breakwater, whose armour layer is made of tetrapods, A dimensionless damage parameter was computed, based on the eroded volume at the end of each test. The test program consisted of three test series (A, B and C) with different durations and wave conditions sequences, considering the low-water level (water depth of 0.20 m at the toe of the structure) and high-water level (0.24 m) and sea states with peak periods Tp = 1.70 s and Tp = 1.98 s and significant wave heights, Hm0, ranging between 0.12 m and 0.19 m. The model was built and operated according to Froude
Year: 2023
Author(s): Lemos, R.; Fortes, C. J. E. M.; Santos, J. A.; Mendonça, A. C.
Editor: Rilem
Keywords: 3D surface model; Position sensor; Damage evolution; Breakwater
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Damage Evolution Prediction during 2D Scale-Model Tests of a Rubble-Mound Breakwater: A Case Study of Ericeira
Melby presents a formula to predict damage evolution in rubble-mound breakwaterswhose armour layer is made of rock, based on the erosion measured in scale-model tests and thecharacteristics of the incident sea waves in such tests. However, this formula is only valid for armourlayers made of rock and for the range of tested sea states. The present work aims to show howthe Melby methodology can be used to establish a similar formula for the armour layer damageevolution in a rubble-mound breakwater where tetrapods are employed. For that, a long-durationtest series is conducted with a 1:50 scale model of the quay section of the Ericeira Harbour breakwater.The eroded volume of the armour layer was measured using a Kinect position sensor. The damageparameter values measured in the experiments are lower than those predicted by the formulationfor rock armour layers. New ap and b coefficients for the Melby formula for the tested armour layerwere established based on the minimum root mean square error between the measured and thepredicted damage. This work shows also that it is possible to assess the damage evolution in scale model tests with rubble-mound breakwaters by computing the eroded volume and subsequently, thedimensionless damage parameter based on the equivalent removed armour units.
Year: 2023
Author(s): Lemos, R.; Santos, J. A.; Fortes, C. J. E. M.
: Modelling
Editor: MDPI
Keywords: Position sensor; Damage evolution; Rubble-mound breakwater
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Determination of Wave Run-Up Through the TimesTack Methology and hrough a Resistive Wave Gauge. a Comparative Analysis
The objective of this work is the comparison of two methodologies used for run-up measurements in a two-dimensional physical model, which represented the protection breakwaters of the Peniche and Ericeira
Year: 2023
Author(s): Lemos, R.; Fontes, R.; Fortes, C. J. E. M.; Andriolo, U.; Rito, J.
Editor: Reterm
Keywords: Breakwater; Physical model; RimeStack; Video analysis; Run-up
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Development of a Bayesian networks-based early warning system for wave-induced flooding
Coastal flooding prediction systems can be an efficient risk-reduction instrument. The goal of this study was to design, build, test, and implement a wave-induced flooding early warning system in urban areas fronted by sandy beaches. The system utilizes a novel approach that combines Bayesian Networks and numerical models (SWAN + XBeach) and was developed in two phases. In the development phase, firstly, the learning information was generated including the creation of oceanic conditions, modeling overtopping discharges, the haracterization of the associated im pacts (no, low, moderate and high) in pedestrians, urban components and buildings, and vehicles, and secondly, the Bayesian Networks were designed that surrogated the previously generated information. After their training, the conditional probability tables were created representing the foundation to make predictions in the operational phase. This methodology was validated for several historical events which hit the study area (Praia de Faro, Portugal), and the system correctly predicted the impact level of around 80% of the cases. Also, the predictive skills varied depending on the level, with the no and high impact levels overcoming the intermediate levels. In terms of efficiency, one simulation (deterministic) of coastal flooding for 72 h by running SWAN + XBeach operationally would take more than two days on a one-logical processor workstation, while the current approach can provide quasi-instantaneously predictions for that period, including probability distributions. Moreover, the two-working phase approach is very flexible enabling the inclusion of additional features such as social components representing a powerful tool for risk reduction in coastal communities.
Year: 2023
Number Pages:
19p..
Author(s): Garzon, J.L.; Ferreira, Ó.; Zózimo, A. C.; Fortes, C. J. E. M.; Ferreira, A. M.; Pinheiro, L.; Reis, M. T. L. G. V.
: International Journal of Disaster Risk Reduction
Editor: Elsevier
Volume:
Volume 96.
Keywords: Wave overtopping; Sandy beaches; Bayesian network; XBeach; Prediction system
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Comunicação
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Application of URANS-VOF models in hydrodynamic study of oscillating water column
This paper presents a comparison of two URANS models based on the VoF approach, FLUENT (Fluent, 2006) and IH2VOF (Lara et al., 2011), to perform a detaiied analysis of the hydrodynamic phenomena outside and inside an open Oscillating Water Coiumn (OWC) device. This analysis is important to determine the ability of each solver in accurate modelling the complex non-linear phenomena which occur in the wave-fluid-structure interaction, in order to use it in the deveiopment of an innovative integrated tool at prototype scale. Numerical results of free surface elevation, oscillating free surface inside the water chamber, amplification factor and phase lag are analysed and compared with experimental data for several incident wave conditions. For an OWC with a fuliy open chamber, good agreement was achieved between experimental data and numerical results obtained with two modeis with different numerical methodologies.
Year: 2016
Number Pages:
209-220pp.
Author(s): Dias, J.; Mendonça, A. C.; Didier, E.; Neves, M. G.; Conde, J. M.; Teixeira, P.
Editor: EdiBios
Keywords: Amplification factor; Oscillating water column; URANS-VOF
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Design of scour protections and structural reliability techniques
In order to account for scour problems, protection systems are usually employed around the foundations, i.e. Arklow Bank OWF and Scroby Sands OWF (Whitehouse et al., 2011). Their design is main-ly of semi empiric nature (De Vos et al., 2011) and probabilistic approaches haven
Year: 2016
Number Pages:
527
Author(s): Fazeres-Ferradosa, T.; Taveira-Pinto, F.; Neves, L.; Reis, M. T. L. G. V.
Editor: CRC Press
Keywords: Structural reliability; Monopile foundations; Protections systems; Scour
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Design optimization of an oscillating water column wave energy converter: analytical and numerical modeling
An analytical model is applied to a schematic case of an oscillating water column (OWC), without head loss, to obtain a first estimation of the chamber hydraulic efficiency. The IH2VOF numerical model of wave-structure interations is applied to perform an investigation, useful to complement and verify the analytical approach and analyses the flow characteristics on the OWC, including nonlinear effects. The numerical model was validated against physical model tests on a schematic OWC stucture at the National Laboratory of Civil Engineering, presenting god agreement.A significant difference of amplification factor parameter was observed between lhe analytical results and numerical results and experimental data, which may be attributed to the absence of head loss in the analytical model.
Year: 2016
Number Pages:
221-232pp.
Author(s): Mendonça, A. C.; Jalon, M.L.; Correia, R.; Dias, J.; Neves, M. G.; Didier, E.
Editor: EdiBios
Keywords: Numerical modelling; Analytical modelling; Oscillating water column
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Ensaios em modelo físico de agitação marítima em redor de um navio livre
Nesta comunicação, descrevem-se os ensaios em modelo físico realizados com o objetivo de caracterizar o campo de ondas em torno de um navio livre, quando sujeito a condições de agitação incidente regular e irregular. Estes dados são especialmente importantes para a validação de modelos numéricos de caracterização da resposta de navios à ação da agitação incidente. Assim, para cada condição de agitação incidente, efetuaram-se medições da elevação da superfície livre e das componentes da velocidade em diversos pontos em redor do navio. Apresentam-se as seguintes análises dos dados experimentais: análise temporal e espetral (espetro de energia e wavelets) dos valores de elevação da superfície livre e análise temporal da velocidade das partículas, a meio da coluna de água. A análise temporal e espetral de cada série de medições obtida permite a caracterização da agitação nos pontos em redor do navio, em termos de alturas, períodos e velocidade. Avalia-se também a influência do navio nas características da agitação.
Year: 2016
Number Pages:
12p.
Author(s): Ramos, A.; Fortes, C. J. E. M.; Pinheiro, L.
Editor: LNEC
Keywords: Análise espetral; Análise temporal; Velocidade; Elevação da superfície livre
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Evaluation of wave overtopping consequences for risk assessment. The case study of Praia da Vitória harbour (Azores, Portugal)
This paper aims at presenting two diíferent methodologies to evaluale wave overtopping consequences: the Analytic Hierarchy Process (AHP) and the Analytic Network Process (ANP). The AHP is based on lhe comparison of successive and paired information that was selecled and quantified having in mind its hierarchic prioritization by taking into account lhe estimated relevance of each considered criterion or indicator. The ANP provides a general framework lo deal with decisions without making assumplions about the independence of higher level elements from lower level eiements and about the independence of the elements within a levei. In fact, the ANP uses a network without the need lo specify leveis as in a hierarchy structure iike lhe AHP. Influence is a central concept in the ANP. Applicalion of the AHP and the ANP melhodologies to lhe case study of Praia da Vitória harbour (Azores, Porlugal) is presenied. With the AHP, a consequences level map is obtained.
Year: 2016
Number Pages:
411-422pp.
Author(s): Lourenço, I.; Santos, J. A.; Fortes, C. J. E. M.; Reis, M. T. L. G. V.; Garcia, T.; Poseiro, P.; Craveiro, J.
Editor: EdiBios
Keywords: Analytic Network Process (ANP); Analytic Hierarchy Process (AHP); Risk assessment; Consequences overtopping; Wave overtopping
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Investigating the use of a video technique for wave run-up measurements on a breakwater in a laboratory flume
Wave run-up parameters are key factors in studying coastal flooding. An experiment was performed at LNEC to study wave run-up and overtopping on a breakwater.This work investigates the possibility of measuring wave run-up by using a video-monitoring technique.Water level oscillations were identified on the breakwater slope over time. Wave run-up was marked on each timestack image produced for each test.Run-up events were identified and related to the surf similarity parameter. Properties of wave run-up derived from video imagery were analysed and compared to data from a wave gauge placed over the breakwater cross-section. Results confirmed that the video imagery technique is an alternative technique for measuring run-up in physical model experiments.
Year: 2016
Number Pages:
478-480pp.
Author(s): Andriolo, U.; Poseiro, P.; Reis, M. T.; Bastos, A.P.; Fortes, C. J. E. M.; Garcia, T.
Editor: Instituto Hidrográfico
Keywords: Timestack; Image processing; Physical model; Overtopping; Run-up; Hydrodynamics
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Metodologia de análise e correção de medições de componentes de velocidade por ADV para propagação de ondas
Neste artigo apresenta-se uma metodologia que visa minimizar os erros associados à medição por ADV (Acoustic Doppler Velocimetry). Estes erros podem ter duas causas: insuficiência de partículas em suspensão na coluna de água; e desalinhamento dos eixos do ADV com os eixos coordenados do problema. Seguindo esta metodologia, aplica-se primeiramente um filtro digital para eliminar as frequências elevadas fisicamente irrealistas e, em seguida, aplica-se uma transformação de coordenadas para alinhar as componentes de velocidade medidas com o sistema de coordenadas do problema, sendo possível identificar o desalinhamento do ADV face a esse sistema de coordenadas.Apresenta-se a aplicação desta metodologia na propagação de ondas regulares num canal.
Year: 2016
Number Pages:
101-104pp.
Author(s): Conde, J. M.; Neves, C. F.; Fortes, C. J. E. M.
Editor: Instituto Hidrográfico
Keywords: Canal de ondas; Ondas regulares; Transformação de coordenadas; Filtro digital; ADV
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Modelação física em canal da propagação de ondas na Praia da Galé, Algarve
Para a praia da Galé, Algarve, foram efetuados um conjunto de ensaios em modelo físico (canal de ondas) com o principal objetivo de analisar a hidrodinâmica da propagação de ondas sobre um fundo rochoso, para várias condições de agitação regular e irregular incidente. Efetuaram-se medições da elevação da superfície livre com sondas resistivas ao longo do canal e das componentes da velocidade com ADV, a meio da coluna de água em várias secções ao longo do canal. A evolução dos resultados ao longo do canal permite um melhor conhecimento do processo de propagação e contribui com dados para a validação de modelos numéricos.
Year: 2016
Number Pages:
463-466pp.
Author(s): Ramos, A.; Fortes, C. J. E. M.; Conde, J. M.; Gabriel. S.; Reis, R.
Editor: Instituto Hidrográfico
Keywords: Análise espectral; Análise temporal; Canal de ondas; Praia da Galé; Modelação física
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Numerical simulation of the motions and forces of a moored ship in Leixões harbour
Ships berthed inside sheltered basins can experience excessive movements due to waves. The paper presents an integrated numerical tool that interconnects several numerical models to reproduce the most relevant physical phenomena associated to wave action on a moored ship, the resulting ship movements and the forces on mooring lines and fenders. A new methodology was developed to determine the hydrodynamic forces on the ship.A non-linear phase resolving Boussinesq model is used to propagate waves from outside the harbour to wherever desired location inside the harbour. A modified version of a 3D panel method model computes the hydrodynamic coefficients of the ship, whereas the Haskind relations determine the wave forces on the ship. The time series of the moored ship motions and forces on moorings are obtained with another numerical model. This new methodology is used to replicate the scale model tests of a moored tanker inside Leixões Harbour.
Year: 2016
Number Pages:
217-223pp.
Author(s): Pinheiro, L.; Fortes, C. J. E. M.; Santos, J. A.; Rosa-Santos, P.
Editor: Taylor & Francis Group
Keywords: Harbour; Leixões; Forces on mooring lines; Wave propagation; Moored ship
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O papel da modelação física no apoio aos estudos de engenharia costeira e portuária. Desafios e oportunidades
Neste artigo, apresenta-se uma descrição do papel da modelação física no apoio aos estudos de Engenharia Costeira e Portuária, ilustrando-se as suas potencialidades com exemplos de casos de estudo.Referem-se os contributos inovadores em conceitos, equipamentos, técnicas e procedimentos experimentais que têm sido desenvolvidos nos recentes anos. Assim, apresentam-se metodologias a explorar no futuro, tais como procedimentos destinados a facilitar, agilizar e automatizar as análises de estabilidade e galgamentos de quebra-mares, assim como dos danos no manto protetor, provocados pela agitação marítima nele incidente, e o acesso remoto a ensaios experimentais, e à informação associada à realização destes, a clientes/investigadores interessados.Por fim, são apontados cenários de desenvolvimento para a modelação física de modo a lidar com as consequências das alterações climáticas, e que incorporem: a) sequências de eventos de temporal, incluindo efeitos cumulativos, b) a subida do nível médio do mar; c) técnicas de medição não intrusivas que permitam obter a análise de fenómenos complexos, com características de grande variabilidade temporal e espacial, sem interferir nos mesmos ou no próprio sistema modelado.
Year: 2016
Number Pages:
13p.
Author(s): Fortes, C. J. E. M.; Capitão, R.; Lemos, R.; Neves, M. G.; Pinheiro, L.; Reis, M. T. L. G. V.
Editor: LNEC
Keywords: Engenharia costeira e portuária; Desafios e oportunidades; Casos de estudo; Modelação física
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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
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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
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Year: 1973
Author(s): Carvalho, M. M.
Editor: ******
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Relatório Científico
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Regime geral de extremos da agitação marítima na Costa Oeste de Portugal.
N/A
Year: 1994
Author(s): Carvalho, M. M.; Capitão, R.
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RTIS project. Portuguese contribution to the collection phase of the project. Port management authorities.
N/A
Year: 1994
Author(s): Santos, J. A.; Covas, J. A.
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RTIS project. Portuguese contribution to the collection phase of the project. Tug activities in the Portuguese ports.
N/A
Year: 1994
Author(s): Covas, J. A.; Santos, J. A.
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Valores extremos da agitação marítima. Metodologia para passagem ao largo da agitação marítima local.
N/A
Year: 1994
Author(s): Carvalho, M. M.; Covas, J. A.; Reis, M. T.; Fortes, C. J. E. M.; Capitão, R.
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Valores extremos da agitação marítima. Relatório de Progresso de 1993 (3.º ano),
N/A
Year: 1994
Author(s): Carvalho, M. M.
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Ensaios em modelo reduzido do perfil-corrente do molhe de protecção do porto de recreio náutico do porto de Sines.
N/A
Year: 1993
Author(s): Silva, L. G.
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Ensaios em modelo reduzido do porto de pesca de S. Miguel, Açores. Ensaios tridimensionais de estabilidade e galgamentos.
N/A
Year: 1993
Author(s): Silva, L. G.
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Modelação por elementos finitos da propagação e deformação de ondas marítimas em zonas costeiras. Missão a Barcelona
N/A
Year: 1993
Author(s): Fortes, C. J. E. M.
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Nova ponte do Tejo em Lisboa. Colaboração na apreciação das propostas à 2.ª fase do concurso, nas áreas de hidráulica, sedimentologia, navegação e segurança da navegação.
N/A
Year: 1993
Author(s): Marcos Rita, M.; Pires Elias, N.; Campos, A. G.; Pinheiro, A. D.; Alves, L. M.
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Obras adicionais de protecção do porto de Ká-Hó. Ensaios bidimensionais de estabilidade e galgamentos.
N/A
Year: 1993
Author(s): Silva, L. G.
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Outro
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Relato da missão a Bruxelas (28 a 30 de Outubro de 1998) para participação na 10ª Reunião da Acção Concertada Added Value Services in VTMIS do Programa Comunitário de I&D TRANSPORTS . Relatório efe
N/A
Year: 1998
Number Pages:
3 p.
Author(s): Covas, J. A.
Editor: ******
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Short-term stochastic numerical and physical simulation of sea waves - Proposta de Projecto de Investigação apresentada ao Programa PRAXIS XXI, na área científica de Engenharia Civil
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Year: 1998
Number Pages:
53 p.
Author(s): Capitão, R.; Pires Silva, A.; Medina, J. R.; Carvalho, M. M.
Editor: ******
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Transformações Não-Lineares de Ondas Marítimas em Zonas Costeiras - Proposta de Projecto de Investigação apresentada ao Programa PRAXIS XXI , na área científica de Engenharia Civil
N/A
Year: 1998
Number Pages:
50 p.
Author(s): Covas, J. A.; Fortes, C. J. E. M.
Editor: ******
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V Programa Quadro da União Europeia. Preparação da discussão dos Programas Específicos. Documento de trabalho da Comissão (COM (97) 553 Final). Grupo de Trabalho 6 Sustainable Mobility and Intermod
N/A
Year: 1998
Number Pages:
2 p.
Author(s): Covas, J. A.
Editor: ******
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Valores extremos da agitação marítima no Algarve - Proposta de Projecto de Investigação apresentado ao Programa de Intervenção nos Laboratórios do Estado (MCT-FCT), sub-projecto Valorização e Protec
N/A
Year: 1998
Number Pages:
11 p.
Author(s): Carvalho, M. M.; Capitão, R.
Editor: ******
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