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| Relationship Between Occurrence of Debris Flow and Antecedent Precipitation:Taking the Jiangjia Gully as An Example |
| Cui Peng,Yang Kun,Chen Jie |
| Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resource, 610041, Chengdu, China |
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Abstract Characteristics of precipitation in source area of debris flow in Jiangjia Gully is presented corresponding to the occurrences of debris flow. The relationship between rainfall and debris flow occurrence and the impacts of antecedent precipitation on occurrence of debris flow and are discussed. It is found that the moisture of soil varies greatly and the intensity of short duration rainfall triggering debris flow changes in different part of rainfall period. Experiment indicates that the attenuation coefficient of antecedent rainfall is 0.78. The method of principal components analysis is applied to study the impact of the rainfall factors on occurrence of debris flow in order to understand the contribution of antecedent precipitation. The results show the contribution of antecedent precipitation is maximum. Questions are raised for further study.
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Received: 20 March 2003
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