Run-out analysis of flow-like landslides triggered by the Ms 8.0 2008 Wenchuan earthquake using smoothed particle hydrodynamics
Flow-like landslides have caused significant damage and casualties worldwide. However, studying such phenomena with traditional simulation methods is made difficult by their complex fluidization characteristics. In this paper, we use smoothed-particle hydrodynamics (SPH) for the run-out analysis of flow-like landslides. Compared with conventional methods, the proposed SPH modeling technique is the combination of a Bingham flow model and Navier–Stokes equations in the framework of computational fluid dynamics. At first, two benchmark problems of dam break and granular flow are simulated and verified to evaluate the accuracy of the SPH model. Then, run-out analyses are performed for flow-like landslides triggered by the Ms 8.0 Wenchuan earthquake that occurred on 12 May 2008 in Sichuan Province, China. Run-out analyses of the Tangjiashan, Wangjiayan, and Donghekou landslides are conducted by the application of SPH models to real flow-like landslides. All simulations show good agreement with characteristics of flow-like landslides observed in the field. We have found that numerical modeling can capture the fundamental dynamic behavior of these flow-like landslides and produce preliminary results for hazard assessment and site selection for reconstruction in earthquake-prone areas.
KeywordsRun-out analysis Flow-like landslides Smoothed-particle hydrodynamics Hazard assessment Wenchuan earthquake
This work was supported by the State Key Laboratory of Geohazard Prevention and Geo-environment Protection (no. DZKJ-0808), the National Natural Science Foundation of China (Grant nos. 41072202, 40802070, and 40841014), the Shanghai Municipal Education Commission and Shanghai Education Development Foundation (Shu Guang Project No. 08SG22), the Shanghai Leading Academic Discipline Project (no. B308), and the Kwang-Hua Fund for the College of Civil Engineering, Tongji University.
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