Sediment Motion in the flow where a bed-load and a suspended load coexist

Abstract

Bed material load has been classified into a bed load and a suspended load based on their pattern of motion. And then the theoretical and expreimental investigations were carried out on each motion separately. But the moving characteristics of each motion should be connected smoothly, because both types of sediment are supplied into the flow from the bed due to the action of water flow. Considering such a concept, the first unified simulation model for bed material load was constructed in this study by extending the saltation model proposed previously. This model enables us to investigate the mechanism of transition between a bed load and a suspended load, and to analyze a series of particle trajectory in the condition where both type of motion coexist.