http://repositorio.lnec.pt:8080/jspui/handle/123456789/53 2026-04-04T21:00:41Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1018961 Avaliação da vulnerabilidade da Praia da Vitória (Terceira, Açores) aos galgamentos costeiros Lima, L.; Fortes, C. J. E. M.; Zózimo, A. C.; Pinheiro, L. Este trabalho1 apresenta o estudo da vulnerabilidade da Praia da Vitória (Terceira, Açores) aos galgamentos costeiros, por meio de uma metodologia SIG aplicando álgebra de mapas. A metodologia empregada em Praia da Vitória foi adaptada daquela adotada pela GRAFCAN (Cartográfica de Canarias, S.A, 2023), no âmbito do projeto LIFE-GARACHICO, em sua área piloto - Garachico, Tenerife, Ilhas Canárias. A Praia da Vitória é uma comunidade exposta a eventos de galgamento costeiro. Para avaliar a vulnerabilidade desta comunidade a estes eventos, fatores como a altimetria, as características das edificações urbanas (densidade e antiguidade), o patrimônio cultural e natural, o uso e ocupação da terra, bem como as características da população (densidade e proporção de dependentes) foram considerados. A metodologia aplicou uma média ponderada desses seis fatores para estimar a vulnerabilidade total da área de estudo a eventos de galgamento. Os resultados mostram que a vulnerabilidade média na Praia da Vitória é, em geral, classificada como baixa a média, tornando-se ligeiramente mais alta perto da linha costeira (até os 20m de elevação), o que, dependendo da probabilidade de ocorrência de galgamento de ondas, pode aumentar o risco de inundação costeira 2025-05-26T00:00:00Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1018953 Analysis of the performance of two moving mesh methods applied to semi-submerged structures with a rotational DOF Pereira, C.Y.; Teixeira, P.; Didier, E. Numerical analyses of a buoy with a rotational DOF and a Pendulor-type wave energy converter subjected to incident regular waves are carried out. The ANSYS Fluent® software, based on the Reynolds Averaged Navier-Stokes equations, is used for the free surface flow simulations. The k–ω SST turbulence model and the Volume of Fluid technique, to consider the two-phase flow, composed of air and water, are employed. The performance of two moving mesh methods are analyzed, the dynamic mesh (DM) and sliding mesh (SM) methods. The numerical results of the free decay test and the incident wave over the buoy, obtained by both moving mesh methods, show very good agreement with experimental ones. Besides, both moving methods have similar results in the case of the incident wave over the Pendulor device. The DM method required from 1.29 to 1.44 times the computational time of the SM method. Therefore, both methods have good accuracy to deal with problems that involve semi-submerged structures with a rotational DOF in a plane. However, the SM method has the advantage of requiring less computational time. 2025-06-15T00:00:00Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1018785 Improving surfability assessment along a submerged detached breakwater at praia da Vagueira, Portugal Tavares, P.; Mendonça, A.C.; Fortes, C. J. E. M.; Bicudo, P. A case study aiming to improve surfing conditions over a submerged detached breakwater, intended to be placed in front of Praia da Vagueira (Aveiro, Portugal), was concluded in April 2022. The final results are revisited and refined by incorporating an alternative wave breaking line detection method, using the resulting eddy viscosity parameter from the COULWAVE numerical model. The detected wave breaking line is shown to align well with results from a fully 3D RANS-based k – ω SST turbulence simulation. This approach allows for a more detailed analysis of surfability parameters, particularly when 3D simulations are computationally demanding. 2024-06-04T00:00:00Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1018737 Wave Overtopping of Rock and Stepped Coastal Revestments With Very Shallow Foreshores Martinez, C.; Mendonça, A.C.; Lemos, R.; Fortes, C. J. E. M.; Mendes, D. Coastal revetments are commonly constructed at the land-sea boundary to control shoreline retreat and protect infrastructure from coastal hazards, such as wave overtopping and coastal flooding. An innovative approach to enhance existing rock revetments involves incorporating steps, which can improve coastal amenities by providing seating and viewing areas. However, current empirical wave overtopping formulations do not consider hybrid configurations combining rock and stepped elements. This study investigates overtopping performance for both conventional and hybrid rock revetment solutions. To address the lack of empirical data for such hybrid structures - commonly found along the Portuguese coast - physical modelling tests have been conducted with two revetment cross-sections: (i) a conventional double layer rock armour slope and (ii) a hybrid one where the upper layer of rock was replaced with concrete steps. Existing semi-empirical formulations provided in the EurOtop Manual were compared with measured values of the relative mean wave overtopping discharge. Results showed that semi-empirical formulations underpredict the relative mean wave overtopping discharge values by up to a factor of 33 for rock-only revetments and up to 23 for hybrid rock and stepped revetments. 2025-06-22T00:00:00Z