The “6·06” Disaster Characteristics and Forming Mechanism of Debris Flow in Wangmo, Guizhou Province
详细信息
- 责任者：Zhu Yuan (State Key Lab. of Geo-Hazard Prevention and Geo-Environment Protection ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Yu Bin
- 刊名：Journal of Mountain Research
- 出版年：2012
- 卷期：30(5)
- 关键词：泥石流 ; debris flows ; 贵州 ; Guizhou Province
- 页码：p.599-606
- 图表：3 illus., 5 tables, 11 refs.
- 分类号：1800
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
摘要
On June 6,2011,most of the northern areas of Wangmo County in Guizhou Province had the biggest rainfall in a century and led to breaking out a large scale group debris flows.The disaster caused serious harm to local residents and traffic.The flow disaster characteristics of Dahao gully are particularly outstanding.Some tributaries were developed in Dahao gully.Its gully bed slope is relatively moderate,but steep slope and larger catchment area for the formation of the debris flow select hydrodynamic conditions.The Dahao gully is located in classic rock development area and has thicker loose deposits.Because the bank slope of Dahao gully is more steep,there are 19 shallow landslides in it according to field investigation.In addition,The landscape was strongly destroyed by villagers.Terraces were fortified along the ditch for special source of material to the out breaking of debris flow.The authors can found that the formation mechanism is not consistent by the study of its four tributaries.2# tributary has more gentle slope and more shallow landslides,so its forming type is the shallow landslide-debris flow.But the rest of three tributaries have more steep slope and they are the gully-shape debris flow. According to investigation,the Dahao gully can still outbreaks debris flow in the condition of strong rainfall after this disaste,but the scale will be reduced and it can still causes greater harm under the action of rare and heavy rain similar to “6·06”.