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The purpose of this experiment is to understand the effect of sand transported from upstream reach of river on both deformation of bed with cohesive sediment and vertical bed structure. In this experiment, the amount of sediment feeding is equal to the amount of equilibrium bed-load transport, and experiment was continued until the deformation of the bed reaches the dynamic equilibrium state. As a result, characteristic vertical structure consisting of “sand layer”, “sand-clay mixed layer” and “clay layer” were confirmed on the bed. In addition, it was seen that the existence of waves formed over the surface of cohesive sediment leads such vertical bed structure.

EFFECT OF SAND TRANSPORT ON DEFORMATION OF BED WITH COHESIVE SEDIMENT