灾害学2012，Vol.27Issue(1)：5-9,16,6.
汶川县映秀镇红椿沟特大型泥石流形成机制及堵江机理研究
Study on Mechanism of Formation and River Blocking of Hongchuangou Giant Debris Flow at Yingxiu of Wenchuan County
摘要
Abstract
On August 14, 2009, a catastrophic giant debris flow occurred at Hongchun gully in Yingxiu town, Wenchuan County due to continuous heavy rainfall. It completely interrupted the traffic the Du-Wen highway and rushed to the Minjiang River and dammed the river. The river is diverted to the Yingxiu town and dozens of houses in the newly built area of Yingxiu became an island, which seriously threatened the achievements of post-disaster rehabilitation and reconstruction. The study of basic characteristics, the deformation and failure mechanisms, the types and countermeasures is of importance for control of debris flow disasters in high seismic intensity area. Taking the giant debris flow occurred at Hongchun gully as an example, the formation mechanism of the debris flow and the causes of highway and river blocking are discussed, the development trend of debris flow is predicted and the stability of key places of material sources is analyzed based on a study of geological background and conditions and basic features of geological hazards. It is pointed out that the formation and river blocking of the debris flow at Hongchun gully is not only related to loose material sources and heavy rainfall, but also closely related to the unique landform and topography. The results show that the giant debris flow at Hongchuan gully started from upstream Ganxipu branch ditch, the materials became dam and burst, then rushed into the Minjiang river together with the materials of the main ditch and converged with the materials from debris flow of upstream Shaofang gully in the Mingjiang river. So the river was dammed. The material sources in the Hongchun gully are rich. The countermeasures must be strengthened to prevent the recurrence of debris flow disasters there.关键词
边坡/泥石流/形成机制/堵江机理/汶川地震/汶川县映秀镇Key words
slop/ debris flow/ formation mechanism/ mechanism of river blocking/ Wenchuan M8.0 earthquake/ Yingxiu town of Wenchuan分类
天文与地球科学引用本文复制引用
甘建军,孙海燕,黄润秋,汤勇,范崇荣,李前银,许向宁..汶川县映秀镇红椿沟特大型泥石流形成机制及堵江机理研究[J].灾害学,2012,27(1):5-9,16,6.基金项目
国家重点基础研究发展计划("九七三"计划)课题"强震作用下斜坡失稳机理及分布规律"(2008CB425901) （"九七三"计划）
