Abstract
It's well known that the thin sheet flow on steep slope channels has phenomenon of Roll-wave trains, if Froude number exceeds about 2 (Ultra-rapid flow). This paper's purpose is to make exprimentally clear for internal structures of the flow with Roll-wave trains in view point of specified flow. These Roll-wave flows have remarkable charactaristics that appear in very small water depth, have tremendous water level changes, and are high speed flows. Therefore, these authors adopt two nonintrusive type equipments, that is, ultrasonic levelmeter and Laser-Doppler-Velocimeter to carry out these experiments. The results of experiments indicate that the Roll-wave flows have some universal and specific patterns of velocity profiles.
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