10 YEARS EROSION-SEDIMENTATION MONITORING: SYSTEM BASED AUTOMATIC INTERPRETATION IN COASTAL AREA OF BREBES REGENCY, CENTRAL JAVA']JAVA PROVINCE, INDONESIA

Nowadays, coastal dynamics are mostly viewed in relation to erosion-sedimentation process. It is important to monitor the erosion-sedimentation in the coastal area in order to reduce its negative impact. This paper aims to identify the erosion-sedimentation process in the coastal area of Brebes Regency, Indonesia, using the automatic interpretation of a geographic information system (GIS) for ten years of analysis. Brebes Regency was chosen as the research area due to its high intensity of sedimentation occurrence. It is also traversed by the Jalan Pantai Utara as the most heavily used road in Indonesia. The automatic interpretation is demonstrated through the utilization of band ratio and the Digital Shoreline Analysis System (DSAS). Neither this type of analysis nor the study area in question has ever been examined before. As novelty, the result shows that sedimentation occurrences of up to 3.9 km were recorded in the most significant case in 2007-2016. This sedimentation is obviously as accumulation of the sediment load and sediment material, at least during last ten years. The total length of the shoreline change is the initial research in history, which precisely measures the shoreline change in Brebes Coastal Area. This research result is considered as a valuable data in coastal management for local authority, especially to handle the problem on coastal erosion and to identify the appropriate location for mitigation action due to erosion process.