On the Analysis of Mechanism of River-Bed Variation by Characteristics

Abstract

In this paper, a new method using the characteristic curve for analysing the mechanism of river-bed variation in a river in which the sediment is mainly transported as bed-load is presented. This method is introduced on the basis of the assumption that both of stream flow and river-bed profile vary gradually and the computation of river-bed variation is proceeded step by step. Various interesting phenomena of river-bed variation resulting from the sediment transport can be explained clearly by this characteristics method. As some examples, the deformations of mound and depression of river-bed in uniform flow of water and the deposition of sediment in reservoir are treated, and then the mechanism of their behaviours are ascertained.