Evaluating bank erosion and identifying possible anthropogenic causative factors of Kirtankhola River in Barishal, Bangladesh: an integrated GIS and Remote Sensing approaches

Authors : Shaikh Ashikur RAHMAN, Md. Muzahidul ISLAM, Md. Abdullah SALMAN, Muhammad Risalat RAFİQ

Pages : 179-190

Doi:10.26833/ijeg.947493

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Publication Date : 2022-07-10

Article Type : Research Paper

Abstract :In Bangladesh, riverbank erosion has turned into one of the most frequently occurring natural disasters, and it affects the socio-economic and livelihood status as well as the environment of the adjoining areas. Kirtankhola River in Barishal, is this kind of river. This study assesses the amount of erosion-accretion, examines river profile, detecting key anthropogenic factors behind it, and signifying channel shifting of the river within 10 years insert ignore into journalissuearticles values(from 2009 to 2019);. The study used Landsat Satellite imageries, geospatial techniques, and a semi-structured questionnaire survey throughout the study area. The study showed that erosion dominants at the left bank of river insert ignore into journalissuearticles values(17.1 ha/year);, whereas the accretion rate is higher at the right insert ignore into journalissuearticles values(19.72 ha/year);. Besides, cross-section at selected points of the river providing an evident indication of the river widening thus river course shifting. According to 61% of the participants in the questionnaire, high waves generated through water vehicles are the main culprit for this extensive erosion. The number of launches has increased significantly within the studied time-period, and most of the launches run over 30 km/h velocity, where it should be less than 20km/h. The study explored a mechanism of how centrifugal force produced by water vehicles increases the intensity of riverbank erosion in the meandering area.
Keywords : Remote Sensing, Riverbank Erosion, Anthropogenic factors, Meandering, GIS