STUDY ON DEBRIS FLOW CONTROL (2)-Debris Flow in Bends of Rectangular Section-

Abstract

Characteristics of supercritical flows around curved sections of open channels are discussedin this paper. Laboratory experiments on 45° bend of clear water flow and high concentra-tion flow are accomplished and the applicability of the theories so far is checked. Lenau'sanalysis which is based on the energy, continuity, and irrotational equations better fits thanKnapp's wave concept which is based on the momentum, continuity, and the wave angleequations. There are no evident differences in the characteristics of the flow between clearwater and highly concentrated water. Amplification of the roll waves along the outer wallis rather well estimated by applying Lenau's formula. Among some available methods forthe reduction of superelevation in curves and in the downstream tangents, the method ofmultiple vertical curved vanes across the channel are discussed.Characteristics of supercritical flows around curved sections of open channels are discussedin this paper. Laboratory experiments on 45° bend of clear water flow and high concentra-tion flow are accomplished and the applicability of the theories so far is checked. Lenau'sanalysis which is based on the energy, continuity, and irrotational equations better fits thanKnapp's wave concept which is based on the momentum, continuity, and the wave angleequations. There are no evident differences in the characteristics of the flow between clearwater and highly concentrated water. Amplification of the roll waves along the outer wallis rather well estimated by applying Lenau's formula. Among some available methods forthe reduction of superelevation in curves and in the downstream tangents, the method ofmultiple vertical curved vanes across the channel are discussed