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宁南县矮子沟“6.28”特大灾害性泥石流成因和特征 被引量:10

Causes and Characteristics of 28 June Disastrous Debris Flow Event in Ningnan County of Sichuan,China
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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.
出处 《山地学报》 CSCD 北大核心 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~~
关键词 泥石流 矮子沟 暴雨灾害 debris flow Aizi ravine rainstorm
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