Abrasions of Riverbed Materials Yielded from the Watersheds with Different Geology And Their Effects on Longitudinal Fining of Bed Material Composition

Abstract

Most grain-bed rivers show the longitudinal sorting on riverbed materials. This phenomenon is due to combination of the selective sorting and the abrasion. We developed the stochastic model of bed-load transport with the abrasion, and analyzed on 3 model rivers, which have the different tendency of the concavity. It was found that the relative importance of the selective transport and the abrasion on longitudinal sorting is related to the characteristics of abrasion and the grain distribution of watershed geology and lithology.