The roles of riparian vegetation have been noted from the view point of the river environment and flood control. Suspended sediment concentrations are measured in an open channel with cylinders installed across the whole channel width in their multiple rows. Cylinders are placed in stagger with their equal spacing on the bed.
Distributions of suspended load in an open channel with cylinders agree with Rouse distributions by using effective frictional velocities which are estimated by considering the drag force of cylinders. Flux distribution of suspended load in an open channel with cylinders is calculated. Flux of suspended load in an open channel with cylinders is found less than that without cylinders over the whole depth.