Abstract
In this paper, a process of forming the transverse ribs in the mountainous rivers are focused on. It is difficult to conduct some experiments that mountainous bed structures form, such as step-pool and transverse ribs. On the condition that bed slope is steep, water and sediment flow is too fast to measure sediment movement and to grasp sediment discharge. Therefore, there are a few papers treating flume experiments with sediment supply. That is why we tried to conduct series of experiments that anti-dune and transverse ribs form in the condition that bed composed of sand and cobbles and also the condition that sediment supplied from the upstream of channnel. As results of experiments, we found characteristics of sand and cobbles movement through anti-dune on each conditions of composed ratio of cobbles.
