Analysis of shoreline changes using the bilko method on landsat imagery in Karawang regency (1999-2019)

Abstract

Karawang Regency is one of the districts in Indonesia which has the longest coastal area, with a length of 76.42 km and an area of around 1,168.85 km2 of coast. The dominant process that occurs on the coast of Karawang Regency is abrasion and the coastline retreating between 50-300 meters in a direction. The purpose of this study was to determine the extent of shoreline changes that occurred in Karawang Regency using multi-time Landsat imagery with a tidal approach. The result Changes in the shoreline were more dynamic during the period 1999 - 2009 with an abrasion area of 8611954m2 and an accretion of 5471645m2. This is because during that period, there were two different types of tides, where in 1999 there was a mixed-semidiurnal (Double Leaning), while in 2009 the tide was mixed-diurnal (Leaning Tunggal). Then for the period 2009 - 2019, there was the same type of tide, namely the mixed-diurnal type tide (Leaning Tunggal), which caused the detected coastline to experience slight changes. Each segment experienced different line changes in each study period due to variations in slope, land cover, and river estuary morphology.