Temporal Evolution of Typical Debris Flows in Wenchuan Earthquake Areas： Case Study of Zoumaling-Gully Debris Flows in Mianzhu County

详细信息   

• 责任者：Liang Jingtao (Sichuan Geological Survey ; Chengdu 610081 ; China) ; Wang Jun
• 刊名：Journal of Engineering Geology
• 出版年：2012
• 卷期：20(3)
• 关键词：泥石流 ; debris flows ; 四川 ; Sichuan Province
• 页码：p.318-325
• 图表：4 illus., 14 tables, 1 ref.
• 分类号：1800
• issnNo：ISSN1004-9665
• isbnNo：CN11-3249/P

摘要

The Zoumaling stream is a typical debris flow gully because of the large numbers of loose geomaterials induced by the Wenchuan Earthquake. Three debris flow events have occurred after the Earthquake, and caused serious property loss. Two typical debris flow events occurred respectively on September 24, 2008 and on August 13, 2010. This paper combines the RS image and field investigation data. It analyzes the formation conditions of the Zoumaling debris flows, and compares the evolution characters of the gully after three rainy seasons after Wenchuan earthquake using RS image data of 2008, 2009 and 2010. The results show that the source initiation of the Zoumaling debris flows with a complex supply process in different rainfall intensity. The debris flow initiation began from the branch gullies, and then evolved into a whole basin debris flow. Finally, this paper analyzes the formation and evolution trend of this debris flow gully. The results show that the Zoumaling is a high frequency debris flow gully. The large amount of loose geomaterials are still distributed in the gully, which is the advantageous factor for large debris flow to occur.