Author(s): G. Bombar
Linked Author(s):
Keywords: No Keywords
Abstract: In this study, experiments are performed to investigate the sediment transport under unsteady flow conditions. The sediment motion is recorded by a camera and the bed load is collected at the downstream end of the channel. The velocities and water depths are also measured. Painted sediments are used to determine the travelling distances. As expected, a hysteresis on the functional relation between*q and*τ is observed, i.e. the bed load in the falling limb is greater than the rising limb, due to the time history of the sediments in motion. The sediments entrained into the flow travel further than the ones entrained later. During the first part of the rising limb and final part of the falling limb the entrained sediments are greater in size and more uniform than those corresponding to the peak. The bed load motion is not continuous, it is sporadic.
Year: 2009