Trend Analysis of Shoreline Changes of the Ganges in the North West Region of Bangladesh
The Ganges basin, extending from Tibet to the coast of the Bay of Bengal, is one of largest river basins of Asia and a significant part of it lies in Bangladesh. The temporal change along the left bank of the Ganges flowing through the North West region of the country (Chapainawabganj, Rajshahi, Natore and Pabna district) is the focus of this study. Landsat images from 1980-2018 along with Google Earth historical imagery have been used to delineate approximately 230 km shoreline and Digital
... ine and Digital Shoreline Analysis System (DSAS), an extension in ArcGIS, has been used for analyses. The Shoreline Change Envelope (SCE) and End Point Rate (EPR) methods have been used to determine the shoreline changes. The SCE method determined a maximum migration of 10,054 m for the study time period of 1980 to 2018 in Chapainawabganj district. During this period, the maximum accretion and erosion rate have been determined 258.5 m/y and -231.8 m/y respectively both in Chapainawabganj district. From the shorelines delineated from historical satellite images, it has been observed that the bank along Chapainawabganj district is more dynamic compared to that of Rajshahi, Natore and Pabna. The analysis also shows in most of the erosion occurred from 1980 to 2000 while in 1990-200 and 2010-2018 accretion was dominant. The balance between eroded and accreted land is the reason behind the stable width of the Ganges.