Erosion characteristics of cohesive sediment mixtures

The sediment particles having size smaller than 0.06 mm normally behave as cohesive material. When sand and gravel are mixed with clay and silt, the mixture also exhibits certain amount of cohesion. The erosion characteristics of such cohesive sediment mixtures are presented in this paper. The process of incipient motion condition, bed load transport and suspended load transport of cohesive sediment mixtures were observed to be significantly different from those of cohesionless sediments due to complex and interactive behavior of such sediment mixtures. Clay percentage and unconfined compressive strength of sediment bed are identified as the main parameters affecting the critical shear stress and transport of cohesive sediment. The topic on erosion of cohesive sediment mixtures containing clay and gravel was however not investigated in detail before.

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