23 documents found, page 1 of 3
Conceptual and quantitative categorization of wave-induced flooding impacts for...
Garzon, Juan L.; Ferreira, Ó.; Reis, M. T.; Ferreira, A.; Fortes, C. J. E. M.; Zózimo, A. C.Coastal fooding is a major threat to communities living in low-lying areas and the increase in the anthropogenic pressure in coastal zones and the efects of climate change (e.g., sea-level rise, increase in storminess and its frequency) are promoting an enhancement of the existing risks for population and properties 1–4 . Coastal fooding results from the interaction of oceanic and atmospheric processes with the...
Galgamento do quebra-mar poente de Albufeira: Comparação entre o modelo numéric...
Didier, E.; Ferreira, Ó.; Dias, J.; Neves, D. R.; Carrasco, A. R.; Reis, M. T.; Neves, M. G.Os modelos SPH (Smoothed Particle Hydrodynamics), baseados na formulação Lagrangiana das equações da Dinâmica dos Fluidos, são uma opção atractiva para modelar escoamentos com superfície livre, pois não necessitam de malha computacional, permitindo modelar fenómenos complexos, como a rebentação de ondas e o galgamento. Neste trabalho apresenta-se o modelo numérico SPHyCE em desenvolvimento no LNEC e a sua aplic...
Overtopping hazard on a rubble mound breakwater
Carrasco, A. R.; Reis, M. T.; Neves, M. G.; Ferreira, Ó.; Matias, A.; Almeida, S.A major concern of coastal engineering is not only to access the damage to coastal structures by severe wave overtopping, but also the hazard imposed to users. Local hazard is often associated to the volume of overtopping water per unit of time (called overtopping discharge). Despite two decades of intensive research, it is yet not fully clear to practitioners what is the best method to compute the discharge pa...
The influence of coastal processes on inner shelf sediment distribution : the E...
Rosa, F.; Rufino, Marta M.; Ferreira, Ó.; Matias, A.; Brito, A. C.; Gaspar, M. B.
Small overtopping at Albufeira harbour: field measurements and modelling
Ferreira, Ó.; Reis, M. T.; Carrasco, A. R.; Neves, M. G.; Neves, D. R.; Didier, E.Overtopping evaluation is often performed by empirical methods that still require complementary validation against field measurements. This study presents the first data set of overtopping measured at a breakwater in Portugal, including flow depths, velocities and discharges. Data were collected for small overtopping conditions (lower than 1.24*10-3 m3/s/m) and compared with estimated values from empirical meth...
Maritime structures wave overtopping studies. The portuguese experience
Reis, M. T.; Neves, M. G.; Didier, E.; Ferreira, Ó.; Silva, L. G.; Afonso, C.; Lopes, M.; Fortes, C. J. E. M.A considerable number of studies of wave overtopping at maritime structures are carried out in Portugal almost on a daily basis, mainly by consultants or within the scope of research contracts, both national and European. They cover overtopping evaluation for design of new structures, for assessment of the safety of existing defences, for risk assessment and for warning systems. This paper provides an overview ...
A precise and efficient methodology to analyse the shoreline displacement rate
Baptista, P.; Cunha, T.; Bernardes, C.; Gama, C.; Ferreira, Ó.; Dias, A.The shoreline change rate is one of the most significant parameters in analysing sandy shore behaviour with time. This parameter can be monitored by means flow- and high-resolution survey methods, depending on the objectives of the monitoring programme. Survey efficiency is also very important for achieving high resolution in both space and time. Another important aspect is the precision and significance of the...
Downwearing rates on shore platforms of different calcareous lithotypes
Moura, D.; Gabriel, S.; Ramos-Pereira, A.; Neves, M.; Trindade, J.; Viegas, J.; Veiga-Pires, C.; Ferreira, Ó.; Matias, A.; Jacob, J.; Boski, T.Vertical lowering (downwearing) of shore platform surfaces is a very important mechanism in their morphological evolution albeit much remains incompletely understood. The efficacy of mechanical and chemical weathering acting on a given substrate, together with erosional processes, influences downwearing rates. In order to determine the relationship between lithotypes and downwearing rates, data collected from a...
Downwearing rates on shore platforms of different calcareous lithotypes
Moura, D.; Gabriel, S.; Ramos-Pereira, Ana; Neves, Mário; Trindade, Jorge; Viegas, J.; Veiga-Pires, C.; Ferreira, Ó.; Matias, A.; Jacob, J.; Boski, T.Vertical lowering (downwearing) of shore platform surfaces is a very important mechanism in their morphological evolution albeit much remains incompletely understood. The efficacy of mechanical and chemical weathering acting on a given substrate, together with erosional processes, influences downwearing rates. In order to determine the relationship between lithotypes and downwearing rates, data collected from a...
Análise da evolução das ondas na praia da Cornélia, recorrendo a medições in si...
Rocha, M.; Moura, T.; Fortes, C. J. E. M.; Capitão, R.; Ferreira, Ó.Nesta comunicação faz-se uma análise comparativa entre as medições efectuadas na Praia da Cornélia, na Costa da Caparica, durante os dias 11 a 15 de Maio de 2010, e os resultados numéricos da aplicação do modelo não linear COULWAVE para as condições de agitação verificadas. Tem, portanto, como objectivo principal, a avaliação do desempenho do modelo na simulação da hidrodinâmica da rebentação em condições reais...