Coastline Change Detection by Using DSAS Analysis Method along Kelantan Coast, Peninsular of Malaysia

Kelantan coast is an intimidating and dynamic coastal area in Peninsular Malaysia. Thus, this study focuses on determining the change in the coastal areas between 1955, 1974, 1991, 2010, and 2019. Topographic map, SPOT-5 J, and Landsat-5 thematic mapper were used to arbitrate temporal changes of coastal areas. DSAS analysis method, linear regression rate (LLR), and end point rate (EPR) were utilized to measure the changes in the coastal line. As a result, the maximum LLR rate appeared to be −20.51 m/year and +25.68 m/year for the minimum, perceived as the highest erosion and accretion rate, respectively. Variability of the ERP rate within the year shows the dynamic of the Kelantan coast that is strongly influenced by the Northeast Monsoon (October – February) season. The greatest erosion rate occurred between 1974 - 1991, around −126.07 m/year, while maximum accretion was +111.33 m/year in 2010 - 2019. Human interference, such as built rock revetment and breakwaters on the river mouth, contributed to the high rate of coastal changes. The output of the study will provide helpful information for the coastal area development plans for the local government subsequently.