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Effect of Cohesive and Seepage Force on A Bank Sediment Particle


Affiliations
1 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani-741235, West Bengal, India
2 School of Water Resources Engineering, Jadavpur University, Kolkata, Pin-700032., West Bengal, India
     

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The phenomenon of erosion of a riverbank is extremely complicated and various forces act on bank sediments. Cohesive force between these grains and the force due to seepage of water play an important role among those forces. The present work uses the ‘‘Truncated Pyramid Model (TPM)’’ for the arrangement of grains and proposes generalized equations for calculating escape velocity under cohesion and seepage. The effect of seepage force along with the cohesive force has been studied for different degrees of exposure (fully exposed, half exposed and fully submerged) and compared with the previous study where only the force of cohesion was taken into account. The change in escape velocity due to seepage force for different degrees of exposure has been determined in this paper for three different grain sizes (300 µm, 400 µm and 500 µm of radius) along with different inter-particle distances.

Keywords

Sediments, Riverbank Erosion, Truncated Pyramid Model, Cohesive Force, Seepage Force, Escape Velocity.
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  • Effect of Cohesive and Seepage Force on A Bank Sediment Particle

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Authors

Debasish Biswas
Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani-741235, West Bengal, India
Arijit Dutta
Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani-741235, West Bengal, India
Sanchayan Mukherjee
Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani-741235, West Bengal, India
Asis Mazumdar
School of Water Resources Engineering, Jadavpur University, Kolkata, Pin-700032., West Bengal, India

Abstract


The phenomenon of erosion of a riverbank is extremely complicated and various forces act on bank sediments. Cohesive force between these grains and the force due to seepage of water play an important role among those forces. The present work uses the ‘‘Truncated Pyramid Model (TPM)’’ for the arrangement of grains and proposes generalized equations for calculating escape velocity under cohesion and seepage. The effect of seepage force along with the cohesive force has been studied for different degrees of exposure (fully exposed, half exposed and fully submerged) and compared with the previous study where only the force of cohesion was taken into account. The change in escape velocity due to seepage force for different degrees of exposure has been determined in this paper for three different grain sizes (300 µm, 400 µm and 500 µm of radius) along with different inter-particle distances.

Keywords


Sediments, Riverbank Erosion, Truncated Pyramid Model, Cohesive Force, Seepage Force, Escape Velocity.

References





DOI: https://doi.org/10.24906/isc%2F2020%2Fv34%2Fi1%2F195949