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[1]GAO Yanchao,CHEN Ningsheng,GE Hua,et al.Source Characteristic and Risk Zoning of Debris Flow in Zier Watershed of Kangding City[J].Research of Soil and Water Conservation,2018,25(06):403-407.

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Source Characteristic and Risk Zoning of Debris Flow in Zier Watershed of Kangding City

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 06 Page number: 403-407 Column: Public date: 2018-10-26

Title:: Source Characteristic and Risk Zoning of Debris Flow in Zier Watershed of Kangding City

Author(s):: GAO Yanchao^1,2,3, CHEN Ningsheng¹, GE Hua³, XU Wei³; 1. Key Laboratory of Mountain Hazards and Land Surface Process, Institute of Mountain Hazards and Environment, CAS, Chengdu 610041, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Chengdu Center of China Geological Survey, Chengdu 610081, China

Keywords:: debris flow; Kangding City; source characteristic; risk zoning

CLC:: P642.23;P694

DOI:: -

Abstract:: The loose source characteristics of debris flows are important influence factors and are critical for the zoning of single gully City. Based on the detailed mapping of the genesis, distribution and stability of debris flow sources in the Zi’er Watershed of Kangding City, the total amount of loose debris in the debris flow ditch was calculated. Through the investigation visit, the buried depth and the migration path of the mudslide were determined. Based on the above data, the magnitude and hazard zone of debris flow were analyzed at different frequencies by calculating the flow of flood under different rainfall probabilities. The results show that the peak discharge of debris flow in 20-year return is 65.31 m³/s, and the flow depth is 2 m; the peak discharge of debris flow in 100-year return is 207.47 m³/s, and the flow depth in the ditch is 4 m; the sedimentation range of the 100-year return debris flow is about 20 times larger than the 20-year return debris flow. Through the analysis of the magnitude and frequency of debris flows in such mountainous towns, it can provide the scientific basis for urban construction, disaster prevention and mitigation in the similar areas.

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