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《Journal of Catastrophology》 2016-01
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Rainfall Threshold for Debris Flow in Sanyanyu Valley,Zhouqu,China

Gao Bo;Zhang Maosheng;Zhang Chenghang;Yu Guoqiang;Key Laboratory for Geo-hazards in Loess Area,MLR;Xi'an Center of Geological Survey,China Geological Survey;  
Reasonable rainfall thresholds for the initiation of landslides may play a role in helping mitigating landslide risk. In this study,with Sanyanyu Valley,Zhouqu,as the research object,we calculate the flood characteristic values at different frequencies and their corresponding rainfall thresholds for initiating debris flows of different scales by using the hydrological method. We also divide the early warnings for rainfalls that might induce debris flow into four levels,i. e.,red,orange,yellow and blue,and two preparation and early warning levels. The results show that,for the two early soil states in Sanyanyu Valley,the Level I red early warning values for rainfall inducing debris flow are 56. 10 mm / h and 50. 86 mm / h respectively,the Level II orange early warning values are40. 70 mm / h and 37. 87 mm / h respectively,the Level III yellow early warning values are 31. 74 mm / h and 29. 88 mm / h respectively,the Level IV blue early warning values are 23. 83 mm / h and 21. 69 mm / h respectively,the Level V preliminary early warning values are 7. 31 mm / h and 15. 69 mm / h respectively,and the Level VI preliminary early warning values are 10. 16 mm / h and 9. 48 mm / h respectively. It established the function relationship between the intensity and duration of the rainfalls triggering debris flows of different early warning levels under two early soil states,i. e.,moist and arid in Sanyanyu Valley. The research results can provide scientific bases for regional disaster prevention and reduction and scientific research for Zhouqu.
【Fund】: 国家自然科学基金项目(41302224);; 陕西省科学技术研究发展计划项目(2014KJXX-20);; 国家地质找矿专项(12120114025901)
【CateGory Index】: P642.23
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