Assessment of River Block Probability by Debris Flow along Dujiangyan-Wenchuan Highway after Wenchuan Earthquake, Sichuan Province

详细信息   

• 责任者：Zhuang Jianqi (Key Laboratory of Western China Mineral Resources and Geological Engineering ; School of Geological Engineering and Surveying ; Chang’an University ; Xi’an 710054 ; China) ; Ge Yonggang
• 刊名：Journal of Engineering Geology
• 出版年：2012
• 卷期：20(2)
• 关键词：泥石流 ; debris flows ; 四川 ; Sichuan Province
• 页码：p.195-203
• 图表：4 illus., 2 tables, 22 refs.
• 分类号：1800
• issnNo：ISSN1004-9665
• isbnNo：CN11-3249/P

摘要

In order to evaluate the probability of blocking river by debris flow,the basic data of debris flow gullies are obtained on the basis of field investigation and scale in different precipitation frequency according to a hydrological model. Then, based on the above data and the differentiation formula of debris flow blocking river, this paper assesses the degree of debris flow blocking main river of the study area. It then defines the threshold value of the differentiation formula combined with debris flows that have occurred in the study area and blocked rivers. The results show that the debris flow of Niumian gully and Guanshan gully can block the Minjing river under the 50 years return period precipitation. The debris flow of Shaofang gully, Hongchun Gully and Mozi gully can block the Minjing River under the 10 years return period precipitation.