2004 Volume 48 Pages 871-876
The stepped channel is effective for the energy dissipation of the supercritical flow. Systematical investigation on the energy loss due to the stepped channel flows is required. As the flow condition in the stepped channel, Skimming flow, Transition flow, and Nappe flow are defined. But the clarification of the energy loss has been made only for Skimming flow. In this paper, the residual energy for various flow conditions has been investigated systematically. The effects of the step height, the channel slope, and the total drop height on the residual energy are clarified for various flow conditions. The comparison of the residual energy for various flow conditions shows that the difference of the residual energy due to the flow conditions is negligible for S/dc≥0.5 (dc: critical depth, S:step height). The relative energy loss for various flow conditions can be predicted. Also, the equilibrium condition for each flow condition is shown.
