Vol14 No.9: 1701-1711
【Title】Numerical modeling and dynamic analysis of the 2017 Xinmo landslide in Maoxian County, China
【Author】OUYANG Chao-jun1,2; ZHAO Wei1,2; HE Si-ming1,2,3; WANG Dong-po1,4; ZHOU Shu1, 2*; AN Hui-cong1,2; WANG Zhong-wen4; CHENG Duo-xiang5
【Addresses】1 Key laboratory of Mountain Hazards and Surface Process &Institute of Mountain Hazards and Environment (IMHE), Chinese Academy of Sciences, Chengdu 610041, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China; 4 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 5 Sichuan Engineering Research Center for Emergency Mapping & Disaster Reduction/Sichuan Geomatics Center, Chengdu 610041, China
【Citation】Ouyang CJ, Zhao W, He SM, et al. (2017) Numerical modeling and dynamic analysis of the 2017 Xinmo landslide in Maoxian County, China. Journal of Mountain Science 14(9). https://doi.org/10.1007/s11629-017-4613-7
【Abstract】A catastrophic landslide occurred at Xinmo village in Maoxian County, Sichuan Province, China, on June 24, 2017. A 2.87×106 m3 rock mass collapsed and entrained the surface soil layer along the landslide path. Eighty-three people were killed or went missing and more than 103 houses were destroyed. In this paper, the geological conditions of the landslide are analyzed via field investigation and high-resolution imagery. The dynamic process and runout characteristics of the landslide are numerically analyzed using a depth-integrated continuum method and MacCormack-TVD finite difference algorithm. Computational results show that the evaluated area of the danger zone matchs well with the results of field investigation. It is worth noting that soil sprayed by the high-speed blast needs to be taken into account for such kind of large high-locality landslide. The maximum velocity is about 55 m/s, which is consistent with most cases. In addition, the potential danger zone of an unstable block is evaluated. The potential risk area evaluated by the efficient depth-integrated continuum method could play a significant role in disaster prevention and secondary hazard avoidance during rescue operations.
【Keywords】Xinmo landslide; Runout; Numerical modeling; Dynamic process; Potential risk; High-locality landslide