Change Detection in Erosion-Accretion of Dhaleswari River along with the Land Cover at Riverbanks: A Geospatial Analysis in Tangail, Bangladesh (1976-2016)

Authors: Tanzia Tasneem Ahmed*, Graduate Student at Dept. of Geography and Planning, University of Toledo
Topics: Water Resources and Hydrology, Land Use and Land Cover Change, Remote Sensing
Keywords: Geospatial Analysis, Accretion, Erosion, Land Cover, Image Resolution, Change Detection
Session Type: Poster
Day: 4/4/2019
Start / End Time: 1:10 PM / 2:50 PM
Room: Lincoln 2, Marriott, Exhibition Level
Presentation File: Download

Dhaleswari river is one of the major rivers of the north central river system of Bangladesh. It is a left bank distributary of dynamic Jamuna River. Over years, it has gone through rapid changes along with the morphological changes of Jamuna River. Due to the complex dynamics of multiple river mouths and its length (160 km), the study area was narrowed down to the river reach between Nagarpur and Delduar Upazila of Tangail District. The objective of the study is to determine the changes in Dhaleswari river due to erosion-accretion and changes in land cover at riverbanks in 40 years window. To detect the changes, Landsat Satellite images were taken in a five years interval. After atmospheric correction, rivers were digitized at 1:5000 scale. Field visits and conversation with local people were also included for better understanding.The results of the study indicate that the channel has decreased from 15.56 sq km to 6.65 sq km in area. The rate of this decrease is about 0.24sq km area per year. Mostly accretion was greater than erosion in these years. In 2010-2016 interval, the erosion and accretion came close and net change resulted in erosion. In land cover change analysis, there were a few limitations due to image resolution. So, only broad categories were looked at- fallow land, seasonal croplands, vegetation and waterbody. The analysis in this part is still under work. A major finding in this part is the gradual intrusion of Jamuna river into the north-west of the study area.

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