How are fine sediments described in sediment sheet flow?

Stony debris flow transits to sediment sheet when the river bed gradient becomes gentle. The consists of a water layer and moving layer. Fine sediments are expected behave as part fluid rather than solid phase in Further, it can be thought that fine suspended However, was not possible physically express whether behaves or numerical simulation model. Here we modeled behavior flow. We confirmed applicability new model describe longitudinal deposited flume experiments.