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Geoscience ›› 2021, Vol. 35 ›› Issue (03): 753-762.DOI: 10.19657/j.geoscience.1000-8527.2021.024

• Water Resources and Environmental Geology • Previous Articles     Next Articles

Development Characteristics of Huozigou Debris Flow at Nanwandao,Yanqing District, Beijing

SUN Yongbin1(), WANG Shen1, GAO Lihui2, WANG Ruijun1, WANG Feng3, DONG Shuangfa1, WANG Bing1, ZHANG En1, LI Cunjin1   

  1. 1. Airborne Survey and Remote Sensing Center of Nuclear Industry, Shijiazhuang,Hebei 050002, China
    2. No.1 Electric Power Construction Co.Ltd.,PowerChina Sepco,Shijiazhuang,Hebei 050000,China
    3. China Top RS Technology Co.Ltd., Beijing 100039, China
  • Received:2019-03-26 Revised:2021-04-10 Online:2021-06-23 Published:2021-06-24

Abstract:

In this study, we investigated the Huozigou debris flow at Nanwandao(Yanqing district, Beijing). Through careful investigation and historical data statistics, the development characteristics and formation conditions of the debris flow are unraveled. Dynamic characteristics of the debris flow are studied comprehensively, and the risk area of debris flow are predicted and evaluated, and the corresponding prevention and control measures are proposed. The results show that the dynamic reserve of loose deposits in the debris-flow gully is 18.47×104 m3, which contains four kinds of supply sources, including alluvial diluvial, residual deposit, artificial deposit, and landslide. The debris-flow development stage is in the decline phase. According to the dynamic analysis, the peak flow value is 52.53 m3/s for once-in-a-decade rainfall, 59.25 m3/s for once-in-a-decade rainfall, 68.13 m3/s for once-in-a-50-year rainfall, and 74.85 m3/s for once-in-a-century rainfall, with the total volume of one solid outfall being 0.77×104 m3, 0.87×104 m3, 1.00×104 m3, and 1.10×104 m3, respectively. It is a medium-sized debris flow, and the maximum danger area is 0.238,3 km2. According to the evaluation and analysis, it is still possible to have medium debris flow in this gully, which poses a traffic safety threat to Nanwan village and Qiansha highway downstream. Our results provide a scientific basis for studying the mono-channel early-warning model of debris flow at Yanqing and the related disaster prevention and control.

Key words: Yanqing district, Nanwandao gap, debris flow, development characteristic, hazard prediction

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