ANALYSIS OF SHORELINE DYNAMICS FOR COASTAL MANAGEMENT PRACTICE IN PARIAMAN, WEST SUMATERA

Abstract

Coastal dynamics have a significant effect on the use of coastal resources where more than 60 percent of cities in the world develop in this region and use it for urban infrastructure, settlements, and economic development. shoreline change is one of many indicators of coastal dynamics which is the result of interaction between biotic, abiotic and human activities which further influences policy and management practices for coastal areas. This paper presents the results of study on shoreline dynamics in Pariaman, West Sumatra using vector analysis in DSAS 4.3 between 1988-2003 and 2003-2018. The shoreline is interpreted from three Landsat images, namely Landsat 5 TM 1988, Landsat 7 ETM + 2003 and Landsat 8 OLI / TIRS 2018 that have been corrected (radiometric and geometric). The shorelines derived from Landsat combined with shoreline from topographic map by Badan Informasi Geospasial (BIG) as baseline for net shoreline movement (NSM) and end point rate (EPR) analysis. Then, The data of shoreline changes is used as a basis for qualitative analysis of local government policies on coastal management. The results show that shoreline changes occur dynamically wherein 1988-2003 abrasion occurred with an average rate of 2.88 m/yr and accretion of 1.64 m/yr while in the 2003-2018 an abrasion rate of 2.76 m/yr occurred and accretion rate 1.12 m/yr. This condition occurs along with the increase of longshore current speed. Some of the locations also have faster abrasion and accretion rates due to structural built.