›› 2012, Vol. 33 ›› Issue (7): 2122-2126.

• Geotechnical Engineering • Previous Articles     Next Articles

Study of rainfall threshold of debris flow forewarning in data lack areas

PAN Hua-li1, 2, OU Guo-qiang1, 2, HUANG Jiang-cheng1, 2, 3, CAO Bo4   

  1. 1. Key Laboratory of Mountain Hazards and Surface Progress, Chinese Academy of Sciences, Chengdu 610041, China; 2. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 3. Graduate University of Chinese Academy of Sciences, Beijing 100039, China; 4. Changjiang Project Construction Bureau, Changjiang Water Resources Commission, Wuhan 430010, China
  • Received:2011-03-24 Online:2012-07-11 Published:2012-07-13

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Abstract: Reasonable rainfall threshold index is the key to ensure accuracy of debris flow forewarning. It is significant for the study of the formation mechanism of debris flow, the prediction of the future activities characteristics and the guidance of the prevention and controlling engineering. Most of the mountain areas have few rainfall and hazards data; therefore, both the traditional demonstration method and frequency calculated method can’t satisfied the debris flow forewarning. Through studying the characteristics of the forewarning regions, including the rainfall characteristics, hydrological characteristics, and underlying conditions, a method to calculate the rainfall threshold is put forward based on the initiation mechanism of hydraulic debris flow. Firstly, the critical water depth for the initiation of debris flows is calculated according to the topography conditions and physical characteristics of the loose solid materials. Then, the rainfall threshold is calculated combined with the mechanism of runoff yield and confluence, the change laws of rainfall with altitude, and the rainfall pattern. The results have been used in Shijia Gully in Ningnan city, Sichuan province; and it is shown that this method is reasonable and feasible. This method resolves the problem of debris flow forewarning in the data lack areas and provides a new thread for the debris flow forewarning in the mountain areas.

Key words: rainfall threshold, debris flow, forewarning, data lack area

CLC Number: 

  • TV 144
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