Variation of Curved Channel Bed due to Submerged Thick-Vane

Since the centrifugal force acts on the flow in the curved channels, a transverse water surface gradient occurs and the thalweg is biased toward the outer bank of the bend. The submerged vane may be used to solve various engineering problems of the curved channels. In order to analyze the influence of the submerged thick-vane on the river bed variation in a bend, movable bed hydraulic experiments were conducted in a 90〬 curved rectangular section channel with a small gravel. Installing the submerged thick-vanes in the bend increases the maximum scour depth. But if the vanes are installed in a uniform obtuse angle, the maximum scour depth was reduced. If the flow rate in the channel bend with vanes equals to the channel forming discharge, the location of the maximum scour depth moved downstream. However if the flow rate is smaller than the forming discharge, the location of the maximum scour depth moved upstream. The channel bed change due to the submerged thick-vane have been dependent on the interaction of attack angle, flow rate, and thickness of vanes.