康定市子耳沟泥石流的物源特征与危险区划  

Source Characteristic and Risk Zoning of Debris Flow in Zier Watershed of Kangding City

作　　者：高延超[1,2,3] 陈宁生 葛华[3] 徐伟[3] GAO Yanchao;CHEN Ningsheng;GE Hua;XU Wei(Key Laboratory of Mountain Hazards and Land Surface Process,Institute of Mountain Hazards and Environment,CAS,Chengdu 610041,China;University of Chinese Academy of Sciences,Beijing 100049,China;Chengdu Center of China Geological Survey,Chengdu 610081,China)

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所山地灾害与地表过程重点实验室,成都610041 [2]中国科学院大学,北京100049 [3]中国地质调查局成都地质调查中心,成都610081

出　　处：《水土保持研究》2018年第6期403-407,共5页Research of Soil and Water Conservation

基　　金：国家自然科学基金(41502337);中国地质调查局项目(121201010000150003)

摘　　要：泥石流的物源特征是重要的影响因子,对单沟的危险区划至关重要。通过对康定市子耳沟流域内的泥石流物源成因、分布及稳定性的详细测绘,计算了泥石流沟的松散物源总量;通过调查访问确定了历史泥石流的淤埋范围,泥深及运移路径。以上述资料为基础,通过对不同降雨概率下清水流量的计算,分析了在不同频率下,可能发生泥石流的规模及危害范围。结果表明:20年一遇的泥石流峰值流量为65.31m^3/s,沟口泥深2m;100年一遇的泥石流峰值流量为207.47m^3/s,沟口泥深4m;后者的淤埋范围约为前者的20倍。通过对此类山区城镇泥石流的规模频率分析,为类似区域内的城市建设和防灾减灾提供科学依据。The loose source characteristics of debris flows are important influence factors and are critical for the zoning of single gully City.Based on the detailed mapping of the genesis,distribution and stability of debris flow sources in the Zi′er Watershed of Kangding City,the total amount of loose debris in the debris flow ditch was calculated.Through the investigation visit,the buried depth and the migration path of the mudslide were determined.Based on the above data,the magnitude and hazard zone of debris flow were analyzed at different frequencies by calculating the flow of flood under different rainfall probabilities.The results show that the peak discharge of debris flow in 20-year return is 65.31 m 3/s,and the flow depth is 2 m;the peak discharge of debris flow in 100-year return is 207.47 m 3/s,and the flow depth in the ditch is 4 m;the sedimentation range of the 100-year return debris flow is about 20 times larger than the 20-year return debris flow.Through the analysis of the magnitude and frequency of debris flows in such mountainous towns,it can provide the scientific basis for urban construction,disaster prevention and mitigation in the similar areas.

关 键 词：泥石流 康定市 物源特征 危险性评价 

分 类 号：P642.23[天文地球—工程地质学] P694[天文地球—地质矿产勘探]