Shoreline change behavior study of Jambudwip island of Indian Sundarban using DSAS model

A quantitative analysis of the shoreline migration pattern at various timescales is important to understand the coastal ecosystem and interaction behaviour between sea and land. The sea-level rise due to polar ice and glacier melting has directly affected the coastal environment. The present study attempts to analyze the potential migration characteristics of Jambudwip Island of the Sundarban biosphere in the Bay of Bengal. GIS, Remote Sensing and Statistical analyses have been utilized for this observation. Digital Shoreline Analysis System (DSAS) was used to assess the shoreline change over time span. Moreover, Linear Regression Rate (LRR) and End Point Rate (EPR) were used for statistical analysis to measure the rate of change of shoreline during 2011, 2013, 2015, and 2017. NDVI and single-band threshold method (IR band) has been applied on the Landsat-7 and OLI data to identify the shoreline position. The result showed that the Western part of the island was the most erosive zone and Eastern part is the most accretive zone. Overall, the maximum rate of erosion was 49.08 m/yr and accretion 122.4 m/yr. In consequence, shoreline length has also been changed between 2011and 2017, from approximately 11879.91m to 10374.42 m.