[1]徐继维,于国强*,张茂省,等.舟曲地区泥石流降雨临界阈值[J].山地学报,2017,(01):39-47.[doi:10.16089/j.cnki.1008-2786.000194]
　XU Jiwei,,et al.Critical Rainfall Thresholds for Debris Flows in Zhouqu, China[J].Mountain Research,2017,(01):39-47.[doi:10.16089/j.cnki.1008-2786.000194]
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舟曲地区泥石流降雨临界阈值()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2017年01期
页码:
39-47
栏目:
山地灾害
出版日期:
2017-01-30

文章信息/Info

Title:
Critical Rainfall Thresholds for Debris Flows in Zhouqu, China
文章编号:
1008-2786-(2017)1-39-09
作者:
徐继维1; 2; 3; 于国强2; 3*; 张茂省2; 3; 丛 凯4
1.长安大学 地质工程与测绘学院,西安 710054;
2.国土资源部 黄土地质灾害重点实验室,西安710054;
3.中国地质调查局 西安地质调查中心,西安710054;
4.甘肃省地质环境监测院,甘肃兰州730050
Author(s):
XU Jiwei1;  2;  3; YU Guoqiang2;  3; ZHANG Maosheng2; 3; CONG Kai4
1. College of Geological Engineering and Geometry, Chang'an University, Xi'an 710054, China;
2. Key Laboratory for Geo-hazards in Loess Area, MLR, Xi'an 710054, China;
3. Xi'an Center of Geological Survey, China Geological Survey, Xi'an 710054, China;
4. Gansu Institute of Geo-Environment Monitoring,Lanzhou 730050, China
关键词:
舟曲; 水文学; 泥石流; 触发降雨; 临界阈值
Keywords:
Zhouqu;  hydrology;  debris flow;  triggering rainfall;  critical threshold
分类号:
P642
DOI:
10.16089/j.cnki.1008-2786.000194
文献标志码:
A
摘要:
合理的降雨阈值是确定区域暴雨泥石流减灾防灾的关键。为了探求诱发舟曲地区泥石流的降雨阈值,本研究以舟曲三眼峪、罗家峪为例,研究了在前期含水量一般(湿润)和干旱两种条件下,触发不同预警级别泥石流的降雨雨强与历时函数关系,采用水文学方法计算了不同频率下洪峰流量以及对应的不同规模泥石流启动降雨量阈值。结果表明:在前期含水量干旱和一般条件下,三眼峪、罗家峪泥石流红色Ⅰ级降雨预警值为56.10mm/h和50.86mm/h、橙色Ⅱ级预警值为40.70mm/h和37.87mm/h、黄色Ⅲ级预警值为31.74mm/h和29.88mm/h、蓝色Ⅳ级预警值为23.83mm/h和21.69mm/h,预备Ⅴ级预警值为7.31mm/h和15.69mm/h、预备Ⅵ级预警值为10.16mm/h和9.48mm/h;不同预警级别条件下的降雨雨强与降雨历时成I=α×D~β幂函数关系,和数值在不同预警级别下成规律性变化;能够诱发舟曲地质灾害的降雨特征可分为两种:一是降雨雨强大的单峰型短历时强降雨("点雨");二是降雨雨强小、持续时间较长的"绵绵细雨"。研究成果可作为舟曲区域暴雨泥石流监测预警研究提供科学依据。
Abstract:
A justified precipitation threshold would act as a solution to the engineered control of regional storm-type debris flow. In order to estimate the triggering precipitation for debris flows haunting Zhouqu region, Gansu province, China, two recent debris flow events occurred at Sanyanyu gully and Luojiayu gully, were exemplified for determination of the threshold value. Given antecedent soil moistures in either wet(regular)or dry circumstances, it studied correlation between rainfall intensity and duration in the process of motivating debris flow to various forewarning level. Hydrography method was borrowed to calculate the peak discharges at various frequencies and the associated precipitation threshold in initiating debris flow to varied extents. Results showed that as antecedent soil moistures were in the regular and dry conditions, early warning precipitation in the level of red Ⅰ at Sanyanyu gully and Luojiayu gully arrived to 56.10 mm / h and 50.86 mm / h separately; in orange Ⅱ pre-warning level it was 40.70 mm / h and 37.87 mm / h; in yellow Ⅲ pre-warning level it was 31.74 mm / h and 29.88 mm / h; in blue Ⅳ pre-warning level it was 23.83 mm / h and 21.69 mm / h; in preparatory pre-warning level it was 7.31 mm / h and 15.69 mm / h; in preparatory Ⅵ pre-warning level was 10.16 mm / h and 9.48 mm / h. Relationship between rainfall intensity and duration at different levels of pre-warning could be interpreted as power function, I=α×Dβ, exhibiting regular changes in value in relation to levels of pre-warning. Rainfall leading to geohazard occurrences in Zhouqu region were characterized as two types: one took place with a short duration in the unimodal shape, concentrated precipitation, like as "Point Rain"; another type occurred with low intensity, a longer duration, like as "drizzle". This research will serve as a scientific initiative for regional monitoring and early warning of storm-type debris flows in Zhouqu region and it contributes to geologic hazard prevention and mitigation at local level.

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备注/Memo

备注/Memo:
基金项目(Foundation item):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); 陕西省自然科学基础研究计划项目(2012JQ5001,2015JM4129)[National Natural Science Foundation of China(41302224); Shaanxi Province Science and Technology Research and Development Program of China(2014KJXX-20); Natural Science Foundation of Shaanxi Province, China(2012JQ5001, 2015JM4129)]
作者简介(Biography):徐继维(1987-),男,辽宁阜新人,博士研究生,主要从事地质灾害研究、风险评估研究 [Xu Jiwei(1987-), Male, born in Fuxin, Liaoning province, Ph.D., research on geologic hazard and risk assessment] E-mail:xujiwei@chd.edu.cn
*通信作者(Corresponding author):于国强(1979-),男,内蒙古包头人,博士后,从事土壤侵蚀与水土保持及地质灾害等方面的研究 [Yu Guoqiang(1979-), Male, born in Baotou, Inner Mongolia, Ph.D.,research on soil erosion,water and soil conservation and geologic hazard] E-mail: yuguoqiang23@163.com
更新日期/Last Update: 2017-01-30