摘要
汶川地震过后大量的老泥石流被激活,随着潜伏期的过去,雨季来临,松散物源开始重新活跃。通过对锄头沟泥石流的实地调查及现场测量发现,该沟流域面积较大,支沟发育,支沟及主沟后缘比降大,主沟中下段宽缓,泥石流物源主要为崩塌物源,分布于流域中上部和支沟内,泥石流由中上部和支沟启动,汇聚于主沟内,并沿沟道下段堆积,并通过室内试验等手段,还原了泥石流发生时的激发雨量及物源分布特征。震后极震区泥石流的具有物源类型丰富、易发程度高、激发雨量偏小和支沟群发等特点,该沟泥石流还出现了堵溃型泥石流现象。
A large number of old debris flows such as the Chutougou debris flow were activated due to the Wenchuan earthquake. The Chutougou debris flow in the Wenchuan meizoseismal area is characterized by large drainage area, many developmental branches, large slope of posterior edge of the main ditch and branches and rich source of mudstone as well as blocking debris flow. The provenance is rich in collapse source which is in the upper of the drainage area and in the branches.
作者
李安润
邓辉
余天彬
文静
LI An-run;DENG Hui;YU Tian-bin;WEN Jing(State Key Lab of Geological Hazard Prevention and Cure and Geological Environmental Protection,Chengdu University of Technology,Chengdu 610059;Sichuan Institute of Geological Survey,Chengdu 610081)
出处
《四川地质学报》
2019年第2期285-288,共4页
Acta Geologica Sichuan
关键词
泥石流
极震区
成因机制
发育特征
debris flow
development
meizoseismal area
genetic mechanism
