Pemantauan Perubahan Garis Pantai Menggunakan Aplikasi Digital Shoreline Anaysis System (Dsas) Studi Kasus : Pesisir Kabupaten Demak

Abstract

Shoreline changes in Demak which is caused by abrasion and accretion processes and triggered due to intensive human activities in coastal areas. It is also caused by the tidal flood that often occur in this area and the influence of physical characteristic of the ocean. Abration and accrestion occurs in almost all coastal areas and it happen quite drastic.This research use remote sensing method as a quick study to detect the shoreline changes in Demak with Landsat 7 images in 2011-2012 and Landsat 8 images in 2013-2015 as the primary data. Shorelines information obtained by using rationing method to delineated the water and the land. The 2011 shoreline used as a starting point to calculate the changes between 2012-2015 shorelines. This research use Digital Shoreline Analysis System (DSAS) to calculate the rate-of-changes between the shorelines.The results showing the most significant changes occur in Wedung, Demak with maximum accretions 233.9941 meter and maximum abrations 141.037 meter. The biggest changes at predicton of shoreline changes between 2016-2020 is transect A with accretion +280.92 meter and the lowest is transek H with abration -0.004 meter. Abration and accretion happen because of the lack to maintain the mangrove ecosystem in coastal areas of Demak whose function turned into area of ponds or settlement