Chamani, M. R., Dehghani, A. A., and Beirami, M. K. (2005), “Characteristics of drops with sloping inverts”, 17th Canadian Hydrotechnical Conference, Edmonton, Canada, August 17-19, 865-870.

Abstract

In this investigation, the hydraulic characteristics of vertical drops with sloping inverts at the downstream channel and subcritical flow at the upstream channel have been studied experimentally. Flow characteristics such as pool depth, downstream depth, and energy loss have been measured. Velocity profiles at the upstream and downstream channels were measured with a Prandtl tube. Two physical models of 0.41 and 0.21 m height were built in a channel of 11 m long, 0.405 m wide, and variable heights (0.7 m to 1.2 m). The inverse slope was set at 5, 10 and 15 degrees. Experimental data was compared with the previous investigators’ results for horizontal downstream channel. Two flow regimes have been observed. For small discharges, the flow at the downstream of the drop is subcritical. By increasing the discharge, the second regime occurs where the flow at the downstream of the drop is supercritical. The values of the relative pool depth for sloping inverts are larger than those with horizontal downstream channel. It was found that the values of the relative downstream depth for sloping inverts are slightly larger than those with horizontal downstream channel. The relative energy loss increases by increasing the angle of the inverts from zero to 5 degrees.