River bank erosion risk potential estimation through mechanical and erodibility analysis of soil: A study on left bank of Ganga river near Malda district in West Bengal, India
- 1Department of Geography, University of Gour Banga
- 2Department of Geography, Diamond Harbour Women’s University
Int. Res. J. Social Sci., Volume 10, Issue (3), Pages 23-34, July,14 (2021)
River bank erosion is a risky and common phenomenon in Malda district during monsoon and post monsoon periods of every year. One of the significant causes behind this hazard is the geological nature of the river bank. Geologically river bank of the study area is very weak. The nature of river bank soil textural composition has been measured by basis parameters analysis and mechanical analysis of soil and its erodibility level. Sieve analyses has been done on all collected soil samples and determine uniformity coefficient, coefficient of gradation and sorting coefficient as basic parameters, nature of soil through mechanical analysis of particles after Folk and Worst method and the degree of soil erodibility through Bouyoucos Erodibility Index and ROM scale after ROslan and Mazidah. The results show that the erodibility levels become high to moderate condition along middle to lower extension of left bank line and relatively low along upper extension according to ROM scale. Nature of soil along left bank is dominantly sandy in nature which promotes vulnerable condition of river bank sites. Basic parameters of soil and its mechanical analysis also reveals that unstable condition exist along river bank line but instability condition is increasing from upper to lower segment of bank line. So risk of river bank failure can be measured by determining textural composition of soil.
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