A FUNDAMENTAL STUDY ON THE INHIBITORY EFFECTS OF SEDIMENT TRANSPORT BY ROOT SYSTEMS IN RIVER CHANNEL

Abstract

In this study, we investigated the reduction in sediment transport by the addition of short fibers to silica sand at various mix ratios. The experiment results revealed when a fibrillary material gets mixed with riverbed materials, the sediment transport changes depending on a mixed rate. Based on the experiment results, the relation between a mixed rate and the reduction rate in sediment transport was modeled by an exponential function as the vertical distribution of reduction rates in sediment transport at the surface layer of riverbed. Numerical experiments using two-dimensional analysis of riverbed evolution were conducted, and the analysis results reproduced experiment results very well.