Numerical modeling and dynamic analysis of the 2017 Xinmo landslide in Maoxian County, China

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...

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Bibliographic Details
Published in:Journal of mountain science 2017-09, Vol.14 (9), p.1701-1711
Main Authors: Ouyang, Chao-jun, Zhao, Wei, He, Si-ming, Wang, Dong-po, Zhou, Shu, An, Hui-cong, Wang, Zhong-wen, Cheng, Duo-xiang
Format: Article
Language:English
Subjects:
Avoidance behaviour
Computer applications
Dynamic analysis
Earth and Environmental Science
Earth Sciences
Ecology
Emergency preparedness
Entrainment
Environment
Field investigations
Finite difference method
Geography
Hazards
High resolution
Housing
Image resolution
Imagery
Landslides
Landslides & mudslides
Mathematical models
Modelling
Rescue operations
Residential areas
Risk assessment
Soil
Soil investigations
Soil layers
Soil surfaces
Velocity
中国
动力分析
数值模拟
有限差分算法
滑坡
潜在危险区
茂县
表层土壤
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Summary: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 Mac Cormack-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 depthintegrated continuum method could play a significant role in disaster prevention and secondary hazard avoidance during rescue operations.
ISSN:1672-6316
1993-0321
1008-2786
DOI:10.1007/s11629-017-4613-7