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|Title:||Analysis of sedimentation in connection to grain size and shear stress at lower reach of the Rupnarayan river, West Bengal, India|
|Authors:||Maity, Swapan Kumar|
|Keywords:||Sedimentation;Shear stress;Sediment texture;Skewness;Suspension|
|Abstract:||Bathymetric close grid survey of the lower reach of Rupnarayan River was made using Dumpy Level and Echo sounder interfaced with Position Fixing System (GPS). Simultaneous tidal observations were available at an interval of half-an hour. Velocity during high and low tide is measured by Digital water current meter and floating method. Rate of sedimentation in three seasons (Pre-monsoon, Monsoon and Post-monsoon) was measured by keeping the wooden tray on river bed for few days. Textural analysis of sediment grains by sieving technique reveals that sediments are mainly of fine sand to coarse silt in nature. Moderate to moderately well sorting of sediments indicate low and moderate energy condition in the depositional environment. Predominant positive skewness and mesokurtic to leptokurtic nature of the sediments indicate continuous addition of finer or coarser materials and retention of their original characteristics during deposition. Most of the sediments are transported by suspension with rolling, graded suspension and uniform suspension before deposition. Sediments are deposited by combined effects of marine and fluvial processes under shallow agitating environment and carried by turbidity action. Shear stress during swifter and stronger high tide is more than during slower and weaker low tide.|
|ISSN:||0975-1033 (Online); 0379-5136 (Print)|
|Appears in Collections:||IJMS Vol.45(09) [September 2016]|
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