Abstract
This paper presents the fundamental studies on the bed degradation process of bedrock induced by the bedload transport over the bedrock. We performed the laboratory experiments focusing on the dependency of the grain size and the strength of bedrock for the erosion velocity of bedrocks. The experimental results show that the grain size and strength of bedrock can affect to the erosion velocity equation of bedrocks. In addition, the movement of the sediment particles over bedrock which has constant side inclining bed was measured to understand the direction of sediment over the bed. We also carried out the numerical simulation of bedrock erosion process by the sediment transport over bedrock to understand the performance of the model proposed by us. The comparison between laboratory experiment and numerical simulation shows that the proposed model overestimates the effect of local slope for sediment transport direction over the bedrocks.
