植生抗力特性の時空間分布が流れと河床変動に与える影響

抄録

Two dimensional bed deformation analysis has been performed to verify the effect of spatiotemporal change of vegetation drag characteristics on flow and bed deformation. The simulated domain is the weak meandering region in the Yoshino River. The analyzed results show that the vegetation density has been changed well in few months due to floods and so on. Furthermore, the spatiotemporal change of vegetation density and vegetation height affects on future bed geometry. These results indicate that spatiotemporal change of vegetation drag characteristics should be considered in bed deformation analysis to reproduce both future flow patterns and bed geometry. Furthermore, the effect of spatiotemporal change of vegetation drag characteristics on bed geometry is varied well by size distribution of bed material and the type of sediment transport.