掃流砂礫の分散過程に関する研究 (2)

Abstract

Dispersion and grain size sorting of bed load particles are discussed through some flumetests and stochastic numerical simulation, noticing the distribution of the degree of exposure andpick up rate of individual particle near the bed surface.Under flat bed condition, the thickness of exchange layer is almost same as the maximumgrain size of bed material regardless of the grain size of tracer particles. In the case of smalltractive force, only smaller particles move, but in the case of large tractive force, larger particlesare easier to move and travel downstream faster than smaller particles.