Shoreline Change Analysis Along The Thoothukudi District Coast, Tamil Nadu, India Using Remote Sensing, GIS And Digital Shoreline Analysis System (DSAS)
Abstract
Shoreline change analysis is one of the most crucial components in determining coastal erosion and accretion, as well as in studying coastal morphodynamics. Coastal zones are becoming more vulnerable to coastal devastation as a result of coastal erosion and accretion. The sensitivity of research on shoreline monitoring is justified due to high population density, climate change impacts, and intensified development, all of which are squeezing the ecosystem of coastal zones worldwide. The emerging fields of optical remote sensing, such as source medium and high-resolution satellite imagery combined with avenue programming of Digital Shoreline Analysis System (DSAS) are widely used extended tools for analysing the rate of coastal erosion and deposition. The study has been conducted along the coast of the Thoothukudi district to evaluate two decadal changes with the help of multi-temporal satellite images of 2000, 2010 and 2021. The erosion and accretion rates have been calculated using the Digital Shoreline Analysis System (DSAS V 5.0). The rates of shoreline changes are automatically quantified by using statistical parameters like Linear Regression Rate (LRR), End Point Rate (EPR), and Net Shoreline Movement (NSM) methods. A total of 163 km of shoreline ranked as erosion, accretion and no change zones. About 41.44 km of coastline was found to be accreting with an average of +1.9 m/yr followed by 70.56 km of coastline eroding with an average of -3 m/yr and a stable coastline of 51 km was found. This study demonstrates that the combined use of satellite imagery and statistical methods is beneficial for erosion monitoring and preventive measures. It is also useful in facilitating an in-depth analysis of the temporal and historical movement of shoreline positions.
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