Evolution of sandbank formations (2002-2015) in the Barra do Una Sustainable Development Reserve, Peruíbe-SP, Brazil Neilton Domingos Carvalho, Fabio Giordano, Walter Barrella

Abstract

The geological formation of sandbanks has elongated shapes, generated by linear sedimentation processes and sandy deposits of marine origin, which shelter heliophilous vegetation typical of sandy beaches and dunes on coastal plains. Restinga vegetation is adapted to salinity conditions and sandy soils, with characteristic plant species that are established in a less exuberant way than in the Atlantic Forest. Between these ranges there is a permanently humid depression that has forests with few tree species and many bromeliads. The work analyzed the evolution of sandbanks between 2002 and 2015 in the plain close to the beach of the village of Barra do Una - municipality of Peruíbe/SP, Brazil, with the objective of evaluating the preservation of the coast in this anthropized area of ​​the Reserva de Sustainable Development of Barra do Una (RDSBU). Through analysis of satellite images and aerial photos obtained with a drone, the dimensions of the cordons, previously georeferenced (areas and perimeter), were evaluated over time. The results point to an expansion of the sandbank areas in more than a decade, pointing to the need for complementary studies to understand the dynamics of sediment deposition in occupied locations where the vegetation is systematically altered by man.