Influence of the macrotide on the beaches of Algodoal Island (Paraense Atlantic Coast - Eastern Amazon/ Brazil)
DOI:
https://doi.org/10.22456/1807-9806.140788Keywords:
morpho-sedimentation, beach prism, macrotidal, Equatorial CoastAbstract
This article analyzes the morphodynamics and processes of accretion and erosion on the island beaches of Princesa and Fortalezinha. The methodology was based on topographic, surface sediment sampling, and oceanographic data from the beach face (October 2012 - dry season and March 2013 - rainy season). The beaches showed a low slope (< 2°) in the dry season, characteristics of intermediate beaches, Ω between 4.322 and 4.579 at Princesa beach, and Ω 4.074 to 4.668 at Fortalezinha beach. In the rainy season, they were characterized as dissipative, 5.088 to 6.763 and 5.790 to 6.174, respectively. The winds have a preferred direction of E in the dry season (6.4-7.3 m/s) and NE in the rainy season (4.6-5.2 m/s). The macrotidal regime is semi-diurnal (2.7 to 5.6 m), with dominant waves (0.66 to 0.82 m) of the low-period sliding type, and NE direction. The littoral drift has a preferential NW direction, with variations during the tidal cycle. These beaches are influenced by the adjacent drainage systems (rivers and tidal channels). During the rainy season, the amount of rainfall at the headwaters of the rivers increases the flow of the Marapanim and Maracanã rivers. It influences the increased export of continental sediments (silt and clay) to the coastal region, which are incorporated into the coastal drift and deposited on the beaches at times of low energy.
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