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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 ,Ski mming 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 .

ENENRGY LOSS OF SUPERCRITICAL FLOWS IN STEPPED CHANNEL FLOWS