Numerical investigation on the kinetic characteristics of the Yigong landslide in Tibet, China
Numerical investigation on the kinetic characteristics of the Yigong landslide in Tibet, China
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DOI：
10.5194/nhess-2020-289
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发表时间：
2020-10
影响因子：
4.6
通讯作者：
Zili Dai;Fawu Wang;Hufeng Yang;Shiwei Qin
中科院分区：
文献类型：
--
作者：
Zili Dai;Fawu Wang;Hufeng Yang;Shiwei Qin
摘要。在数值模拟的基础上，再现了滑坡的运动过程，并结合现场调查资料分析了滑坡的动力学特征。在动力学分析中，讨论了滑坡速度、滑出距离、滑坡堆积和能量特征。模拟结果表明，滑坡体在破坏后经历一个加速阶段，在滑坡传播过程中由于摩擦和碰撞的作用，动能逐渐耗散。最后，滑坡体阻断了一公河，形成了巨大的滑坡坝和大面积的堰塞湖。计算出峰值速度约为100m /s，跑出距离约为8500 m。仿真结果与现场实测数据基本吻合，验证了所提SPH模型的良好性能。该方法为快速滑坡危险区的预测和灾害强度的估计提供了一种新的方法。
Abstract. To analyse the kinetic characteristics of a rapid landslide that occurred on 9 April 2000 in Tibet, China, a meshfree numerical method named Smoothed Particle Hydrodynamics (SPH) is introduced, and two-dimensional and three-dimensional models are established in this work. Based on the numerical simulation, the landslide motion process is reproduced and the kinetic characteristics are analysed combined with the field investigation data. In the kinetic analysis, the landslide velocity, run-out distance, landslide accumulation, and energy features are discussed. Simulation results show that the landslide mass undergoes an acceleration stage after failure, then the kinetic energy dissipates gradually due to the friction and collision during the landslide propagation. Finally, the landslide mass blocks the Yigong river and forms a huge landslide dam and an extensive barrier lake. The peak velocity is calculated to be about 100 m/s, and the run-out distance is approximately 8,500 m. The simulation results basically match the data measured in field, thus verifying the good performance of the presented SPH model. This approach can provide a new way to predict hazardous areas and estimate the hazard intensity of rapid landslides.