浮遊砂に関する研究(1) ―河床付近の濃度―

Abstract

In this paper, the distribution of size frequency and the concentration near the bedsurface of suspended sediment were investigated experimentally and theoretically. It wasconfirmed from the consideration of the distribution of size frequency of suspended sedimentthat the equation proposed by Rouse which expresses the vertical distribution of concen-tration of suspended sediment can he adapted for one of graded sediment.An equation for the expression of distribution of sise frequency of suspended sedimentin a vertical direction was introduced and it was found that it is in agreement with theexperimental results. Moreover, an equation for the expression of concentration ofsuspended sediment near the bed surface was obtained on the basis of the consideration ofthe particle motion in a turbulent flow. This obtained equation can yield the concen-tration on the condition of maximum transportation capacity in a turbulent flow.