Abstract
Erosion process of clay riverbed was investigated. The clay riverbed is eroded by the action of water flow. It is also eroded by moving sand and gravel. In this study, the influence of moving sand and gravel on erosion of the clay is investigated. This process is affected by the amount of sand and gravel transport in the river. Movable bed experiments were conducted under the several conditions of both the flow discharge and the rate of sediment supply. As a result, we found that the relationship between the erosion rate of the clay riverbed and the rate of supplied sand has extreme value. It was also found characteristic vertical structure under the bed surface.
