宁南县矮子沟“6.28”特大灾害性泥石流成因和特征  

Causes and Characteristics of 28 June Disastrous Debris Flow Event in Ningnan County of Sichuan,China

作　　者：胡凯衡[1,2] 崔鹏[1,2] 马超[1,2,3] 周公旦[1,2] 田密[1,2,3] 杨东旭[1,2,3] 刘维明[1,2] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,四川成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041 [3]中国科学院大学,北京100049

出　　处：《山地学报》2012年第6期696-700,共5页Mountain Research

基　　金：中国科学院重点部署项目(KZZD-EW-05-01);国家重点基础研究发展计划资助(2011CB409902);中国科学院成都山地灾害与环境研究所青年百人团队项目~~

摘　　要：2012-06-28T5:00,四川省凉山彝族自治州宁南县矮子沟突降强暴雨,引发了特大灾害性泥石流,造成严重的人员伤亡和财产损失。此次泥石流是在长时间的前期降雨和短历时的强降雨共同作用下,从上游支沟坡面和两侧冲沟短时间内形成的,具有发展和运动历时短,规模中等而峰值流量大,泥石流和洪水交替作用等特点。严重的沟道堵塞和中下游松散物质的补充,使得泥石流的峰值流量是清水流量的3～4倍。A disastrous debris-flow event occurred at Aizi Ravine in Ningnan County, Sichuan Province between 5：00 and 6：00 am on June 28,2012. As of July 4,7 people were killed and 33 missing. The debris flows were trig- gered by a local intensive rainfall of 38mm/h after one month antecedent rainfall. The formation area was the sub- catchment belonging to the upstream right tributary. Massive material from hill slopes and small gullies was concen- trated in a short duration of approximate 30 minutes. The peak discharge was amplified by 3 to 4 times because me- andering channels and narrow passes of the main stream accumulated the flows,and a great deal of debris from col- luviums,diluvium,and sediment deposit in the downstream channel were eroded. The event is characterized with short duration of formation and propagation, moderate scale but high peak discharge, and inter-occurrence of flood and debris flow. A lesson from the disaster is low-frequency debris-flow ravines such as Aizi should be paid special attention in the hydropower engineering area.

关 键 词：泥石流 矮子沟 暴雨灾害 

分 类 号：P642.23[天文地球—工程地质学]