Abstract
The Present study highlights the changes in the coastal tract of Rameswaram island located between the geometric location, latitude 9° 10' to 9° 20' N and the longitude 79° 12' to 79° 30' E. Using Geospatial Technology, Long-term changes have noticed from digitized shorelines taken from Landsat imageries and SOI toposheet for the years 1968, 1978, 1988, 1999, 2009 and 2018. Digital Shoreline Analysis System (DSAS) an extension provided by USGS for ArcGIS used to cast transects perpendicular from the baseline, towards the shorelines. High water Line (HTL) has taken as shoreline in this study. The distance between the shorelines has taken from the cast transects plotted from the baseline. For the rate of change calculation, MATLAB component runtime utility for ArcGIS has used. Based on the Linear Regression Rate (LRR) the shore has classified into High Erosion, Low Erosion, Stable and Low Accretion, High Accretion zones. The island has a shoreline length of 78.4 km, and the studies found that 27.83 km (35.41%) of shoreline is accreting nature, 37.90 km (48.21%) of shoreline is stable, and 12.86 km (16.36 %) of shoreline tends to erode. During the field investigation identified that High amount of erosion occurred in the locations near Pamban, Tharavaithopu and Dhanushkodi. Also, Accretion identified over the locations Ayyanthopu, Natarajapuram and Arichumanai tip. Wind action is one of the physical parameters that induced the erosion in some location of this study area.
Highlights
The coastal region is unique on earth surface, where always occur long and short-term changes [1], Erosion and Accretion are the frequent changes that would happen on the coastal regions caused either by natural force or Manmade. [2]Abundance of resources in sea makes peoples settle in near coastal
Digital Shoreline Analysis System (DSAS) is an extension tool that freely provided by USGS, works with ArcGIS platform[7].DSAS will operate to construct the transects from the baseline and this will used to calculate the horizontal movement of shoreline[8]
The Linear Regression Rate (LRR) values along Pillaikulam, Ariyankundu, Pamban, Dhanushkodi, Tharavai Thopu shows negative (-) values implies the erosion over that region
Summary
The coastal region is unique on earth surface, where always occur long and short-term changes [1], Erosion and Accretion are the frequent changes that would happen on the coastal regions caused either by natural force or Manmade. [2]Abundance of resources in sea makes peoples settle in near coastal. The coastal region is unique on earth surface, where always occur long and short-term changes [1], Erosion and Accretion are the frequent changes that would happen on the coastal regions caused either by natural force or Manmade. [2]Abundance of resources in sea makes peoples settle in near coastal. The shoreline is an active coastal feature between the land and sea [3]. In the coastal erosional and depositional studies, the shoreline only can expose the changes in the coast. The satellite imageries with false-colour composition help to identify and extract the shoreline [4]. Arc GIS Software used to delineate the shoreline. Shorelines extracted from Multi-year satellite imageries was the recent trend which helps to identify and assess the changes [5]
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