抄録
Gravel bed rivers are composed of particles of various shapes and sizes. However, effects of particle shapes on sediment transportation and bed variation have not been clarified, because it is difficult to observe particle motion and sediment discharge rate in gravel-bed river during flood flows. This paper demonstrates the effects of particles shape by comparing particle motions between spheres and gravels which are simulated in a numerical movable-bed channel. The result is concluded that gravel particles of shape differing from spheres tend to make all size particles move together by the engagement with the neighboring particles and shapes of particles should be considered for predictor of sediment discharge rate and bed variations.
