Abstract
A sediment transport calculation considering cohesive force is proposed to deal with transport phenomena of cohesive sediment. In the proposed calculation, each sand particle is assumed to be surrounded by a thin layer of clay, and a critical Shields parameter and a bed-load sediment transport rate are modified to include cohesive force acting on the sand particle. The proposed calculation is incorporated into a coupled fluid-structure-sediment interaction model, and applied to wave-induced topographic change of an artificial shallow. Numerical results show that an increase in the content rate of the clay, the cohesive force per unit surface area and the water content causes an increase in the critical Shields parameter and a decrease in the bed-load sediment transport rate, and accordingly reduces the topographic change of the shallow without any change in its trend. This suggests that mixing clay in the pore of the sand particles can reduce the topographic change of shallows.
