抄録
Bed shear stress distribution along the bed surface is derived from boundary layer equation. Then, an effective shear stress for sand waves is expressed as integration of the bed shear stress distribution. As the bed load motion is influenced by fluctuation of flow intensity, the estimation methods of pick-up rate and average step length are proposed by considering these influences. The bed load distribution along a sand wave is calculated by using stochastic model consists of pick-up rate and step length. The results of application to experimental measurements are well good.
