Armor Coat Formation and Fractional Sediment Discharge of Sand Mixtures caused by Rainfall on Bare Slope

Abstract

The sediment transport process on the slope caused by rainfall impact and overland flow is the fundamental phenomenon, and many sediment discharge equations were proposed. Though most of them are proposed for the uniform sand, they are usually used for the estimation of the total sediment discharge of sand mixtures which is one of characteristics of the natural slopes. In this study, we experimentally dealt with the armor coat and the fractional sediment discharge on the slope caused by rainfall impact. Next, in order to simulate the non-equilibrium process of sediment transport we have applied the stochastic model which includes the effect of the sediment pick-up rate by rainfall impact. Since the simulated results have explained the experimental results, the validity of the proposed model has been clarified.