Abstract

Beach width serves as a crucial indicator of coastal dynamics, reflecting sediment transport and shoreline evolution. This study analyzes two relatively undisturbed coastal areas, characterized by dune fields, mudflats, and beaches, to assess the impacts of wave-induced processes, ENSO, earthquakes, and storm surges on accretion and erosion. Using the CoastSat algorithm, satellite imagery, wave climate data, and in situ measurements, spatiotemporal variations were examined. The results highlight the influence of both seasonal and interannual processes, with the February 27, 2010 earthquake (Mw 8.8) significantly altering shoreline variability. These findings reinforce the need for high-resolution monitoring to improve predictive modeling and support sustainable coastal management in the face of climate change. ©2025 IEEE.