Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (6): 1781-1788.doi: 10.13278/j.cnki.jjuese.201506201

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Hazard Assessment on Rainfall-Triggered Landslide and Debris Flow in the Seismic Disturbance Area at Watershed Level

Wang Meng, Jiang Yuanjun, Huang Dong, Li Qianqian   

  1. Key Laboratory of Geo-Surface Process and Mountain Hazards, Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China
  • Received:2014-02-20 Published:2015-11-26

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Abstract:

There are many loose slopes existed in the seismic disturbance area. Landslides and debris flow can be easily induced by a heavy or concentrated rainfall. The hazards often occur in a form of chain in an earthquake region with a severer harm than the one caused by a single disaster. In order to evaluate the geological hazards effectively, we regard the landslide and debris flow as a disaster chain and conduct the analysis synthetically. A coupled model has been developed to assess the hazard degree of debris flow induced by the different 24 h precipitation at watershed level in Baishahe watershed of Dujiangyan City in Sichuan Province. The model comprises of a landslide susceptibility evaluation model, a stability model, a hydrological model to predict unstable slopes and determine the amount of landslides to be involved, and a statistical model to evaluate the hazard degree of debris flow gully by selecting debris flow volume, frequency, basin area, main gully length, height difference, cutting density, and the ratio of unstable gully bed as the evaluation parameters. The results show that the volume of loose material involved in debris flow increase with the intensity of rainfall. However, when 24 h rainfall is over 200 mm, the hazard degree of debris flow does not change any more. Among the 17 debris flows,four debris flows are middle hazardous, twelve debris flows are high hazardous, and one debris flow is very high. It indicates that the potential geological hazard is quite serious in the study area. During the rainy season, 17 debris flows might concentratedly outbreak; which would directly threaten the nearby human lives and properties. The protection engineering and early-alert should be set to eliminate the hazards caused by the debris flows in comply with the high level fortification standard. By the way, it's necessary to take landslide and debris flow as a disaster chain to make the hazard assessment.

Key words: watershed, seismic disturbance area, landslide, debris flow, hazard assessment

CLC Number: 

  • P642.22

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