Appraisal of 2004 tsunami induced shoreline change in South Andaman, India using DSAS

Abstract

The 26^th December 2004 Indian Ocean tsunami is considered as a most disastrous catastrophic event causing economic losses and lives. Andaman and Nicobar Islands (ANI’s) was the first responders of this devastating event in the Indian sub-continent. To appraise the shoreline changes due to this tsunami a study was apprehended using Geographic Information Systems (GIS) and Digital Shoreline Analysis Systems (DSAS). A total of 58 coastal village’s in four zones were identified for quantifying the shoreline changes due to the 2004 tsunami as Net Shoreline Movement (NSM) and End Point Rate (EPR). The results suggest maximum shoreline changes in Wandoor 2005–2018 (NSM 6187.7 m; EPR 530.03 m/year), Sippighat 2005–2018 (NSM 4163.27 m; EPR 356.65 m/year), Manpur 2005–2018 (NSM 4338.29 m; EPR 371.66 m/year), and Mathura 2005–2018 (NSM 4540.9 m; EPR 388.99 m/year) were observed on the coastal front comprising of soft Andaman flysch of sedimentary origin. Andaman administration has constructed high raised concrete seawalls at various villages to prevent coastal population in case of any catastrophic eventualities like the 2004 tsunami.