摘要
2019年8月20日,汶川县暴发了大规模群发性泥石流,经系统收集和整理此次泥石流降雨量数据,分别以汶川县、乡镇、泥石流沟为研究单位,分析了此次泥石流的降雨特征.汶川"8·20"泥石流降雨整体表现出岷江主河降雨量小于两岸泥石流沟道,岷江左岸降雨量大于右岸的趋势;各乡镇、泥石流沟道的降雨指标差别较大.提出了有效降雨的修正方法和新的泥石流启动判定指标,结合汶川"8·20"典型泥石流沟野外考察资料,验证了新指标的准确性.
On August 20, 2019, clustered debris flows occurred in Wenchuan County. The rainfall data thereof were systematically collected and sorted out here. Taking Wenchuan County, towns and gullies as research units, respectively, we analyzed the rainfall characteristics of the debris flows on that day. The rainfall in the Minjiang River was less than that in the gullies on either side of the river, rainfall on the left side of the river was higher than that on the right side, and the characteristic rainfall values in different towns and gullies were mostly of a mixed nature. We developed a new method to modify the effective antecedent rainfall and developed a new index to predict debris flow initiation. According to the field investigation and typical gullies data on August 20, 2019, we verified the accuracy of the new index.
作者
吕小波
游勇
柳金峰
孙昊
刘洋
刘道川
LÜXiao-bo;YOU Yong;LIU Jin-feng;SUN Hao;LIU Yang;LIU Dao-chuan(Key Laboratory of Mountain Hazards and Earth Surface Process,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China;University of Chinese Academy of Science,Beijing 100049,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd,Chengdu 610041,China)
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第6期775-782,共8页
Journal of Lanzhou University(Natural Sciences)
基金
四川省应用基础研究项目(2019YJ0005)
中国科学院重点部署项目(KFZD-SW-425)
国家自然科学基金项目(41772343)。
关键词
降雨特征
降雨阀值
泥石流
汶川县
rainfall characteristic
rainfall threshold
debris flow
Wenchuan County
