Abstract
The effect of a finite patch on flow and bed morphology in the open channel was investigated using laboratory experiment. Two flow conditions, which were below and above the threshold of sediment motion, were considered with various configurations. For flows below the threshold of sediment motion (case 1), the erosion took place primarily opposite the patch and near the leading edge, whereas for the other condition (case 2), sediment deposition was observed within and near the patch due to reduction of shear stress, which was strongly influenced by the flow blockage. For case 1, the degree of scouring depth increased with the flow blockage, and as the submergence ratio increased, the scour depth decreased. For case 2, as the flow blockage increased or the obstruction ratio decreased, the deposition rate within and behind the patch decreased.
