ANALYSIS OF NON-UNIFORM-AEREATED SKIMMING FLOWS IN STEPPED CHANNELS

Generally, stepped channel flows are characterized as aerated flows. For the design of stepped channels, it is important to know the aerated flow characteristics such as the aerated flow depth, the airconcentration ratio, the aerated flow velocity, and the energy head in skimming flows. Recently, the authors clarified the aerated flow characteristics for the quasi-uniform flow region of skimming flows under a wide range of channel slopes. However, for the nonuniform flow region, the aerated flow characteristics were not elucidated. In this study, an equation for the calculation of the aerated flow depth is developed in the nonuniform aerated flow region, and the aerated flow characteristics are determined for the nonuniform aerated flow region under a wide range of hydraulic conditions.