O papel das dunas frontais na proteção do litoral sul do Espírito Santo
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Data
2022-10-18
Autores
Rigatto, Jacqueline Freire
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Editor
Universidade Federal do Espírito Santo
Resumo
Frontal dunes are ridges of sandy dunes with vegetation formed adjacent to the beach. The formation of these geomorphological features occurs as the sediment is transported by the wind from the exposed beach to a cover of plants. They have the largest volumes and extension on dissipative beaches and on reflective beaches they are smaller or non-existent. They have the function of protecting the coast against flooding and erosion caused by waves and high water levels during extreme storm conditions. However, this role is often limited due to the use and occupation of these features. The objective of this work was to determine the performance of the frontal dunes in the protection of the edge, from the use of tools, along the south coast of ES. To determine the wave climate, ERA5 reanalysis data were used, which were validated with Boia PNBOIA Vitória. In addition, ADCP data were also used to analyze the wave climate near the coast. In addition to the wave climate, the tide level, sediments, vegetation and beach profile were analyzed using the XBeach tool. The Sallenger Impact Scale only used tidal, beach profile and wave data. The results indicate that the coast is in a predominant process of dune retreat with levels 1 and 2 of the Sallenger Scale. Regarding the vegetation of the frontal dunes, in the simulations in XBeach there was a greater erosion in the frontal dunes with few plants fixed on them. Even with vegetation the measured beach profiles suffered erosion, but they protected the.shore.
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Palavras-chave
Clima de ondas , XBeach , Escala de Impacto de Sallenger , Vegetação de restinga