Beach morphodynamics on Amazonian fluvio-marine environment (Jubim, Marajó Island, Brazil)
DOI:
https://doi.org/10.26848/rbgf.v18.05.p3697-3717Keywords:
Beach Morphodynamics, Sedimentation, Estuarine Beaches, Macrotide, AmazonAbstract
Fluvio-marine islands are characterized by receiving oceanic influence, but also significant fluvial influence. Together, they form archipelagos of varying sizes, such as Marajó Island, the largest fluviomarine island on the planet. The Jubim District (municipality of Salvaterra) is located on the eastern shore of Marajó Island. The objective of this article was to analyze changes in the morphology and sedimentation of the estuarine beaches of Jubim and surrounding areas during a complete seasonal cycle (March 2023 to March 2024). Data collection was carried out on four specific beaches: Meninas, Baleia, Curuanã, and Salazar. To characterize the morphodynamic state of the beaches, the parameter of slope (°) was used as a reference, derived from the treatment of the topographic data on beach profiles. For granulometric analysis, surface sediment samples were subjected to dry sieving to determine their average size. The beaches showed a granulometry ranging from medium to fine sand, moderately well selected, and the morphological state of the beaches was dissipative to intermediate (beach slope from 0,2° to 2,6°). The beaches have very varied morphometric ranges: topographic elevation of 5.6 m to 2.7 m, and beach width varying from 79 m to 550 m. Erosive processes were observed mainly during the rainy period, with greater sediment deposition during the dry season, favoring a seasonal sedimentary balance.
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