EXPERIMENTAL STUDY ON EFFECT OF DIFFERENCES IN SANDBAR HEIGHT AND WATER DISCHARGE ON RIVERBANK EROSION

Abstract

 There is concern that the risk of riverbank erosion will increase as sandbars develop. Therefore, in this study, we conducted laboratory-scale experiments. A set of experiments were conducted where we formed sandbars, and changed the sandbar height and flow discharge in each case. As a result, it is verified that the riverbank erosion rate increases as the sandbar height or flow discharge increases under the tractive force condition that some sand on the sandbars is transported. On the other hand, our experiments show that when the flow discharge increases to the extent that most of the sand in sandbars is transported, the erosion rate under high flow discharge become smaller than that under low flow discharge.