Abstract
Gravels and boulders cause a severe abrasion of a invert of concrete channel for removing depositted sediment in a reservoir. To understand the mechanism of abrasion is the key to design a channel and to make a maintenance plan of a channel. Although some experimental studies have been performed, it was difficult to measure the motion of gravels and boulders directly because of a highly-disturbed water surface. In this study, the 3D particle method with solid-liquid two-phase-flow model is applied to the flow in a concrete channel in which gravels and boulders are transported in a flow with a small relative depth. Detailed physical properties, a collision impact, an abrasion depth distribution, and so on, are estimated for the four different classes of particle diameters of sediment.
