Morphological Variations and Erosion of Beaches in Central Segment of the State of Rio de Janeiro: Remote Sensing Techniques and Grain Size Parameters
Morphological variations and erosion of beaches in central segment of the state of Rio de Janeiro: remote sensing using techniques and grain size parameters
Abstract
The coastal erosion process represents a great challenge for public managers, especially in medium and big Brazilian cities. A significant portion of cities have been protected by rockfill structures against natural disasters and human action. The increase in storm waves observed during the seasons favors marine flooding that could reach urban areas more frequently, requiring managers to expand coastal protection structures. The objective of this study is to identify areas of coastal erosion and marine flooding in the segment of the coast investigated through remote sensing techniques and analysis of grain size parameters. Methodological procedures involved integrated analysis of remote sensing images from the Landsat 5 (TM) and Landsat 8 (OLI) satellites in the time interval between 1984 – 2024. Twelve sediment samples collected in the backshore and shoreface environments were analyzed, identifying statistical and morphodynamic parameters related to beach sedimentation. Results suggest coastal erosion on the beaches of Jaconé (Maricá) and Monte Alto (Arraial do Cabo), sedimentary stability in Saquarema and sediment deposition on Praia Grande (Arraial do Cabo). Data obtained will serve as support for decision-making regarding geological risk management by the government.