MORPHOMETRIC CHARACTERIZATION OF BANHO AND CAÚRA BEACHES IN THE MUNICIPALITY OF SÃO JOSÉ DE RIBAMAR, SÃO LUÍS ISLAND, STATE OF MARANHÃO, BRAZIL

Antonio Carlos Leal de Castro, Michelly dos Santos Moreira, Marcelo Henrique Lopes Silva, James Werllen de Jesus Azevedo, Helen Roberta Silva Ferreira, José de Ribamar Pinheiro Júnior, Adilson Matheus Borges Machado, Leonardo Silva Soares

Resumo


The aim of the present study was to perform a morphodynamic and sedimentary characterization of Banho Beach and Caúra Beach, which are located in the municipality of São José de Ribamar, state of Maranhão, Brazil (2°33'25"S - 2°33'52"S and 44°02'21"W - 44°03'13"W). Morphodynamic and geological studies were performed on both beaches in campaigns carried out in the dry season (October 2016). Sediment samples were collected along the beach profiles at both beaches for the determination of grain classification and permeability. The direction of the coastal drift current was determined using a red organic fluorescent tracer at Banho Beach. The results showed a greater width of sediments on Banho Beach, with a 624-meter foreshore, whilst Caúra Beach had a width of 105 m, with the advance of the tide at several points, as well as a trough system, sand bar and cliffs. Regarding granulometry, medium-coarse sand was found at Banho Beach and fine sand predominated at Caúra Beach. The sediment permeability test showed an inverse relation to particle size. In the foreshore region, Banho Beach had a lower permeability coefficient (k) and a higher textural class (medium sand), whereas Caúra Beach had a higher coefficient (k) and lower textural class (fine sand). Mean granulometry at Banho Beach was predominantly in the range of 1.48 to 1.79 ɸ, which is classified a medium-coarse sand, whereas the sand at Caúra Beach was classified as fine (2.31 ɸ). The coastal drift experiment at Banho Beach revealed flow parallel to the coastline at a speed of 0.10 ms-1.


Palavras-chave


dinâmica costeira, praia, erosão

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DOI: https://doi.org/10.26848/rbgf.v14.2.p%25p

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