波状路床上の流れの3次元的特性について

Abstract

The three-dimensional characteristics of shear flows over wavy beds are examined ex-perimentally. In order to avoid the difficulty of measurements, experimental conditions aremade as simple as possible. That is, measurements are made on the flows with low Reyn-olds number over channel bed of simplified two-dimensional form.On the visual study of these flows, it is made clear that turbulent characteristics in therange of low frequency play an important role on the formation of alluvial river beds andthe transversal scales of these turbulent lent characteristics are given as the function ofReynolds number of the flow and the ratio of ridge height to water depth.