Abstract
EROSION ACCRETION ASSESSMENT OF KUAKATA BEACH USING HISTORICAL SATELLITE IMAGERIES AND BATHYMETRY DATA ADOPTING RS-GIS TECHNIQUE
Dipen Saha* and Md. Ataur Rahman
ABSTRACT
This study work has been conducted for erosion and deposition analysis of Kuakata beach and quantifying eroded and accreted volume using bathymetry data through remote sensing and GIS technique. Satellite images of coastline during the period of 1978 to 2020 have been collected and analyzed using ArcGIS software. 24 km long Kuakata beach is subdivided into three parts like Lebur Char (13 km), Gangamatir Char (4 km) and Kawar Char (7 km) stretching from west to east. From Satellite image analysis, it is evident that Lebur Char (west part) is vulnerable to erosion, middle part of the Kuakata beach i.e., Gangamatir Char is almost stable, and Kawar Char (east part) is accreting day by day. It is seen that 13 km long coastline has been eroded having an area of 4.8 km2 and 7 km coastline has been accreted having an area of 3.7 km2 has been accreted in last 42 years. During this period the average erosion rate and accretion rate are 9 m/yr and 12.2 m/yr respectively and for last it was 10 years 11.7 m/yr and 21.2 m/yr respectively. Coastline evolution model has been simulated over the year 2010 to 2018 for erosion prone area of Kuakata. It is observed that coastline is moving towards land with time. Erosion rate found from the model also conforms the result of coastline shifting analysis by GIS.
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