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[1]SHI Ziyue,XIN Cunlin,JIAO Zhipeng,et al.Preliminary Analysis on Hazard Risk Assessment on Rockslide-Debris Flow of Yeliguan National Geopark[J].Research of Soil and Water Conservation,2022,29(03):411-418.

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Preliminary Analysis on Hazard Risk Assessment on Rockslide-Debris Flow of Yeliguan National Geopark

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 03 Page number: 411-418 Column: Public date: 2022-04-20

Title:: Preliminary Analysis on Hazard Risk Assessment on Rockslide-Debris Flow of Yeliguan National Geopark

Author(s):: SHI Ziyue¹, XIN Cunlin¹, JIAO Zhipeng¹, LIU Haibo^1,2, LIU Xin³; (1.College of Geograghy and Environmental Science, Northwest Normal University, Lanzhou 730070, China; 2.Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China; 3.College of Earth and Environmental Sciences, Lanzhou Universiy, Lanzhou 730000, China)

Keywords:: Yeliguan; rockslide-debris flow; alpine region; risk assessment; maxEnt

CLC:: P694

DOI:: -

Abstract:: Rockslide-debris flow is a special movement form including collapse, landslide and debris flow, which has the characteristics of high speed, long sliding range and high risk. The identification of its distribution area is the basis of disaster prevention and control. Yeliguan National Geopark is located in the northeast margin of the Qinghai-Tibet Plateau, small and medium-sized rockslide-debris flows densely distributed in the part of the geopark of complex geological environment. Based on the field investigation, 11 influencing factors were selected to assess rockslide-debris flow hazard risk by adopting ArcGIS and maxEnt. The results showed that the rockslide-debris flows mainly developed in the Carboniferous and Permian strata with exposed and broken bedrock surface, the main source of rockslide-debris flow was type of rock; the extremely high-risk area and high-risk area were located in the northwest and south of the study area, accounting for 8.71% of the total area; the AUC values of maxEnt training data set and testing data set were 0.982 and 0.964, respectively, the density of hazard points increased with the ascent of risk grade, which was consistent with the principle of risk grade. The results reflect that rockslide-debris flow was not directly caused by the extremely low surface temperature and the frost heaving force of repeated freezing in the alpine climate environment of the study area, however, the temperature difference between day and night with seasonal temperature difference may accelerate the disintegrating deformation and cracking expansion of rock mass. Meanwhile, high-precision evaluation of maxEnt can objectively provide reference for hazard management and evaluation in similar geoparks.

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Last Update: 2022-04-20