ANALYSIS OF COASTLINE CHANGES ON GILI TRAWANGAN OVER THE LAST TEN YEARS, 2013 TO 2023

Gili Trawangan's development negatively impacts the small island's shoreline, causing erosion and accretion. This development, influenced by human activities, can negatively affect the local community, health infrastructure, and ecological balance. Research on changes in the shoreline is crucial for early warning in managing marine tourism on small islands. The study utilized satellite images, Landsat 8 OLI images, and Landsat 9 images for remote sensing. The Digital Shoreline Analysis System (DSAS) was used to monitor coastline changes, using Net Shoreline Movement (NSM) to calculate changes. Based on the length of the coastline, the Northwest and Northeast zones experienced widespread erosion and accretion, while the Southeast and Southwest zones experienced less. The Northeast and southwest zone experiences the most significant erosion, resulting in substantial land loss every year. At the same time, the northeast and northwest zones experienced significant accretion than others. Overall, Gili Trawangan experienced erosion of 6.77 hectares and accretion of 0.4 hectares, which means a reduction in area of 6.34 hectares over 10 years or 0.634 hectares per year. Rapid development and tourism promotion policies contribute to environmental changes that exacerbate erosion. A comprehensive and sustainable approach is needed to protect the coastline and support sustainable tourism investment.