ANALISIS PERUBAHAN GARIS PANTAI AKIBAT PEMBANGUNAN JETTY DI WILAYAH PANTAI KARANGSONG, INDRAMAYU, INDONESIA

Abstract

A jetty at the river downstream area of the Prajagumiwang River, Karangsong Beach, Indramayu, West Java Province, Indonesia was constructed in 2005. The aim of the jetty construction is to prevent channel siltation as the shipping lanes in that region. The construction of the jetty has an impact on local fishing activities and shoreline change at Karangsong Beach. Satellite image data from Google Earth in 2001, 2008, 2009, 2013, 2014, 2015, 2016, 2017, and 2018 were used to calculate coastal area change and coastline change. The high water line is selected as a proxy for shoreline position to reduce the error related to tidal range in manual digitization. The results of the analysis qualitatively and quantitatively, shoreline changes which were previously dominated by erosion became dominated by accretion after jetty construction. The largest total coastal area and total shoreline change occurred between 2001 and 2008 with the values are 297,136 m² and 13,897 m respectively. In the period between 2008 and 2009 coastal area changes and shoreline changes showing fluctuation value which decreases over time indicate coastal natural processes to reach the equilibrium condition after the construction of the jetty.