Assessment of Tropical Cyclone and Its Impact on the Shoreline Change Using Digital Shoreline Analysis System (DSAS) in Southeast Coast of India

Abstract

The main focus of the present study is to predict the cyclone induced shoreline changes occurred along the Tamil Nadu coast in the past decade (2008 to 2018). Cyclones are one of the major disasters which affect the coastal parts of India almost every year and causes loss of lives and properties. Tamil Nadu is one of the states on the east coast of India that is more vulnerable to Tropical cyclone hazards. Shoreline change rates were calculated with respect to the cyclones Nish-2008, Thane-2011, Nilam-2012, Madi-2013 and Gaja-2018. The rate of erosion and accretion were estimated with respect to the each cyclone. Totally 66 transects were generated with 50m spacing and the length of each transect was 500 m. The major erosion and accretion rate were observed with respect to the Madi cyclone. The maximum long-term erosion and accretion rate obtained is -5.03 m/year and 3.17 m/year, short-term erosion and accretion rate is -4.94 m/year and 4.36 m/year and Net shoreline movement erosion and accretion rate is-50.36 m/period and 44.38 m/period. The results obtained in this research show that the Pondicherry and Vedaranyam coast are generally experiences erosion, with anthropogenic influenced accretion.