Abstract

Globally, 60% of beaches are experiencing erosion due to sea-level rise, coastal storms, and human activity, with Chile being a critical case, as 80% of its coastlines are affected. This study, conducted at Matanzas Beach in the O’Higgins Region, utilizes remote sensing (CoastSat and MNDWI), wave climate analysis (ERA5), and geomorphological techniques (DSAS and drones) to assess coastal dynamics. Between 1985 and 2024, differentiated patterns of erosion and accretion were observed, influenced by ENSO, storms, and the 2010 earthquake. The findings highlight the importance of monitoring and managing coastlines in the face of natural and anthropogenic disturbances. ©2025 IEEE.