碎屑流动力过程的数值模拟

碎屑流是一种常见的地质灾害，往往对流通路径上的各种设施造成严重灾难，同时碎屑流还给泥石流提供物质来源，从而形成不良堆积坝堵塞河道或形成堰塞湖。本文建立了碎屑流动力过程的力学模型及其高分辨率数值算法，预测和评估碎屑流的铺展和堆积过程。应用该数值模型，首先计算了一维经典溃坝问题，计算结果和理论解符合较好。其次，初步分析了碎屑流和障碍物相互作用后的分流和堆积规律，并讨论了碎屑流灾害防治的可能方案。

NUMERICAL SIMULATION OF GRANULAR AVALANCHE DYNAMICS

Granular avalanche happens frequently. The hazard usually causes catastrophic disasters to the manmade system along its passage. In addition, granular avalanche often provides plenty of loose sediment for debris flow, and deposits as loose packing natural dam for avalanche lake formation. A hydrodynamic model is established for granular avalanche, and a high-resolution numerical algorithm is proposed and implemented to simulate its evolution and deposit. Using the numerical model, the classical dam-break problem is at first successfully calculated. Then, the flow and deposit behavior of granular avalanche across a terrain with an obstacle is studied. Based on the results, some preliminary protection schemes for granular avalanche mitigation are discussed.