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Formulation for Critical Shear Stress of Cohesive Sediment Mixture


Affiliations
1 Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
2 Department of Civil Engineering, Jaypee University of Information Technology, Waknaghat, Solan 173 234, India
 

This article describes results of an experimental study on incipient motion of gravel particles present in the cohesive mixtures, i.e. clay–silt–gravel and clay–silt–sand–gravel, in which the percentage of clay varied from 10% to 50% on weight basis. Incipient motion condition is visually and quantitatively identified which responds to sheet and line erosion type appearance on the top surface of the channel bed for clay up to 30% and mass erosion pattern for 40% and 50% of clay. The clay percentage, weighted geometric standard deviation and bulk density of the cohesive sediment mixture are found to be the main parameters that affect the incipient motion of gravel particles. A functional relationship is proposed to determine critical shear stress of gravel particles present in cohesive sediment mixtures. The regression analyses as well as goodness of fit test were conducted for the proposed relationships which were found to be in good agreement with the present data.

Keywords

Clay Content, Cohesive Sediment Mixture, Critical Shear Stress, Incipient Motion, Sediment Transport.
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  • Formulation for Critical Shear Stress of Cohesive Sediment Mixture

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Authors

Umesh K. Singh
Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Z. Ahmad
Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247 667, India
Ashish Kumar
Department of Civil Engineering, Jaypee University of Information Technology, Waknaghat, Solan 173 234, India

Abstract


This article describes results of an experimental study on incipient motion of gravel particles present in the cohesive mixtures, i.e. clay–silt–gravel and clay–silt–sand–gravel, in which the percentage of clay varied from 10% to 50% on weight basis. Incipient motion condition is visually and quantitatively identified which responds to sheet and line erosion type appearance on the top surface of the channel bed for clay up to 30% and mass erosion pattern for 40% and 50% of clay. The clay percentage, weighted geometric standard deviation and bulk density of the cohesive sediment mixture are found to be the main parameters that affect the incipient motion of gravel particles. A functional relationship is proposed to determine critical shear stress of gravel particles present in cohesive sediment mixtures. The regression analyses as well as goodness of fit test were conducted for the proposed relationships which were found to be in good agreement with the present data.

Keywords


Clay Content, Cohesive Sediment Mixture, Critical Shear Stress, Incipient Motion, Sediment Transport.

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DOI: https://doi.org/10.18520/cs%2Fv113%2Fi11%2F2105-2111