Characteristic Rainfall for Warning of Debris Flows  

作　　者：HU Kaiheng Cui Peng Wang Chuanchang Li Yong Lu Xiaobing 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Processes, Chinese Academy of Sciences, Chengdu, 610041, China [2]Institute of Mountain Hazards and Environment, Chinese Academy of Sciences & Ministry of Water Conservancy, Chengdu, 610041, China [3]Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100080, China

出　　处：《Journal of Mountain Science》2010年第3期207-214,共8页山地科学学报（英文）

基　　金：funded by the National Program on Key Basic Research Project (973 Program) (Grant No. 2008CB425802);the Knowledge Innovation Program of Chinese Academy of Sciences (Grant No. KZCX2-YW-302);the National Natural Science Foundation of China (Grant No. 40701014)

摘　　要：A characteristic rainfall is introduced to overcome the difficulties encountered in determining a critical rainfall value for triggering debris flow.The characteristic value is defined as the rainfall at which debris-flow occurrence probability shows a rapid increase,and can be used as a warning rainfall threshold for debris flows.Investigation of recorded debris flows and 24-hour rainfall data at Jiangjia basin,Yunnan Province,in southwestern China,demonstrates the existence of such a characteristic rainfall.It was found that the characteristic rainfall corresponds to the daily rainfall of 90% cumulative probability by analyzing the basin's daily rainfall histogram.The result provides a simple and useful method for estimating a debris-flow warning rainfall threshold from the daily rainfall distribution.It was applied to estimate the debris-flow warning rainfall threshold for the Subaohe basin,a watershed in the 2008 Wenchuan earthquake zone with many physical characteristics similar to those of the Jiangjia basin.

关 键 词：Debris flow Wenchuan earthquake warning rainfall threshold statistics of daily rainfalldistribution 

分 类 号：P332.1[天文地球—水文科学] P642.23[水利工程—水文学及水资源]