The processes of sediment transport in high flow intensity are studied through numerical simulation using a coupled CFD (computational fluid dynamics)-DPM (discrete particle method) model with a focus on discussing the co-existence problem of bed load and suspended load and the corresponding sediment concentration distribution. It is shown that for the sediment-laden flows, the components of turbulence intensity decrease slightly as sediment concentration increases. The bed load and suspended load both coexist in a transition layer. Particle collision plays an important effect on the velocity of bed load movement. The total sediment transport rate obviously increases with the increase of flow intensity, but the bed load transport rate does not clearly increase. In the present study, the maximum value of suspended sediment concentration curve is about 7%, and increases with the increase of the flow intensity. The simulation results are generally consistent with experimental observation.

通过使用耦合CFD（计算流体动力学）-DPM（离散粒子法）模型的数值模拟，研究了高流量强度下的泥沙运移过程，重点讨论了床荷载与悬浮荷载的共存问题以及相应的问题。沉积物浓度分布。结果表明，对于充满泥沙的水流，随着泥沙浓度的增加，湍流强度的成分会略有下降。床层荷载和悬架荷载都共存于过渡层中。粒子碰撞对床层负荷运动的速度具有重要影响。总的输沙速率随流量强度的增加而明显增加，但河床负荷的输运速率并未明显增加。在目前的研究中，悬浮泥沙浓度曲线的最大值约为7％，并随着水流强度的增加而增加。仿真结果与实验观察基本吻合。