Baffles and check-dam systems are often used as granular flow (rock avalanches, debris flows, etc.) control structures in regions prone to dangerous geological hazards leading to massive landslides. This paper explores the use of numerical modelling to simulate large volume granular flow and the effect of the presence of baffles and check dam systems on granular flow. In particular, the paper offers a solution based on the smoothed particle hydrodynamics numerical method, combined with a modified Bingham model with Mohr–Coulomb yield stress for granular flows. This method is parallelised at a large scale to perform high-resolution simulations of sand flowing down an inclined flume, obstructed by rigid control structures. We found that to maximise the flow deceleration ability of baffle arrays, the design of baffle height ought to reach a minimum critical value, which can be quantified from the flow depth without baffles (e.g. 2.7 times for frictional flows with friction angle of 27.5°). Also, the check-dam system was found to minimise run-out distances more effectively but experiences substantially higher forces compared to baffles. Finally, flow-control structures that resulted in lower run-out distances were associated with lower total energy dissipation, but faster kinetic energy dissipation in the granular flows; as well as lower downstream peak flow rates.

挡板和止水坝系统通常用作易于发生危险地质灾害并导致大规模滑坡的区域的颗粒状流（岩崩，泥石流等）控制结构。本文探索了使用数值模型来模拟大体积颗粒流以及挡板和止回坝系统的存在对颗粒流的影响。特别是，本文提供了基于平滑粒子流体动力学数值方法的解决方案，并结合了改进的Bingham模型和Mohr-Coulomb屈服应力，用于颗粒流。大规模并行化此方法，以执行由刚性控制结构阻碍的，倾斜的水槽下砂流的高分辨率模拟。我们发现，要使挡板阵列的流动减速能力最大化，挡板高度的设计应达到最小临界值，该临界值可以从不带挡板的流动深度进行量化（例如，摩擦角为27.5°的摩擦流的2.7倍）。同样，发现止流坝系统可以更有效地最小化跳动距离，但与挡板相比，其受力要大得多。最后，导致较小跳动距离的流量控制结构与较低的总能量耗散有关，但在颗粒流中的动能耗散更快。以及较低的下游峰值流速。人们发现，止流坝系统可以更有效地最小化跳动距离，但与挡板相比，其受力要大得多。最后，导致较小跳动距离的流量控制结构与较低的总能量耗散有关，但在颗粒流中的动能耗散更快。以及较低的下游峰值流速。人们发现，止流坝系统可以更有效地最小化跳动距离，但与挡板相比，其受力要大得多。最后，导致较小跳动距离的流量控制结构与较低的总能量耗散有关，但在颗粒流中的动能耗散更快。以及较低的下游峰值流速。