Dinâmica da Orla da Praia de Navegantes, Santa Catarina, Brasil, através do Sensoriamento Remoto

Resumo

The sedimentary dynamics of the edge of Navegantes Beach, in Santa Catarina state, Brazil, was studied through remote sensing and using satellite images recorded in the past years, between 2004 and 2018, of both ends of the beach arch. UAV overflights in opportunistic sampling campaigns in 2019 were carried out after storm surges events to assess the effects of extreme weather events on sedimentary dynamics in a short time scale. A total of 32 images were obtained, 16 from each area. By the images, it was possible to see a reduction in the restinga strip in the North area (Gravatá Beach) from 2016 onwards, while in the South area (Pontal Beach) an increase was observed since 2012 after the implementation of the project of embryonic dunes for the recovery of the sandbanks. Gravatá Beach continues to face serious erosion problems due to the irregular occupation of the sandbanks, while Pontal Beach sandbanks continue to increase, with a large volume of sediment deposited, which provides conditions for a greater development of the native vegetation that fixates the dunes.  Key-words: remote sensing, edge dynamics, restinga, beach erosion, UAV.