abstract for investigating the effect of bed form in alluvial channels on the amount of bed load transport, a set of experiments was carried out in a tilting flume under unsteady flow conditions (hydrograph). the produced hydrographs were in triangular form with a maximum discharge of 30 to 45 lit/s/m. three size of sediment particles were used with equal to 1.5, 2.1 and 3.0mm, clear water with...

A set of laboratory experiments were conducted to study the impact vegetation on bed form resistance and load transport in a mobile channel. Vegetation stems simulated by using arrays emergent polyvinyl chloride (PVC) rods several staggered configurations. The total flow was divided into bed, sidewall, resistances. Bed further separated grain (i.e., ripples dunes) By analyzing experimental data...

Field and laboratory studies indicate that changes in riverbed morphology often lag changes in water discharge. This lagged response produces hysteresis in the relationship between water discharge and bed form geometry. To understand these phenomena, we performed flume experiments to observe the response of a sand bed to step increases and decreases in water discharge. For an abrupt rise in dis...