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Influence of debris flow on channel evolution
语种英语
Liu, Jiankang1,2,3; Cheng, Zunlan1,2; Zhang, Xiaogang1,2; Cheng, Si4
2011
会议录名5th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Prediction, and Assessment
会议录编者/会议主办者R. Genevos ; D.L. Hamlion ; A. Prestinuizi
页码231-236
会议名称5th International Conference on Debris-Flow Hazard Mitigation: Mechanics, Prediction, and Assessment
会议日期2011
会议地点Padua
会议举办国Italy
出版者American Society of Civil Engineers (ASCE)
产权排序1
摘要Affected by the active plate motion, the upper Minjiang River develops more than 21 debris flow valleys. After the Wenchuan earthquake on May 12, 2008, the geohazards occur more frequently and seriously because of the increased debris source, and 9 debris flows blocked the mainstream. Based on the characteristics of debris-flow dams, model tests have been accomplished. Given the junction angle of 90°, influence of debris flow on channel evolution is discussed for different flow density, and discharge ratio and momentum ratio between debris flow and the mainstream water flow. The results show that there is a linear relationship between momentum ratio RM(ratio between momentum for flow in tributary and mainstream) and shrink ratio 5 (index defined to describe the magnitude of channel shrink after inflow of debris) of mainstream, and also an exponential relationship between the ultimate average width Bm(index defined to describe the average width of river channel after dam failure) of mainstream and the coefficient of velocity variation Fv(ratio between velocity for flow in mainstream after dam failure and before its formation). © 2011 Casa Editrice Universita La Sapienza.
关键词Accumulation rates Debris flow fan Fixed point observations Genesis and evolution Jiangjia Gully Lithological features Transverse profile Transverse section
DOI10.4408/IJEGE.2011-03.B-033
ISBN号9788895814469
收录类别EI
EI收藏号Accession number:20122315082170
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文献类型会议论文
条目标识符http://ir.imde.ac.cn/handle/131551/24063
专题山地灾害与地表过程重点实验室
通讯作者Liu, Jiankang
作者单位1.Key Lab. of Mountain Hazards and Surface Processes, Chinese Academy of Sciences, Chengdu 610041, China;
2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
3.Graduated University of Chinese Academy of Science, Beijing 100049, China;
4.China University of Geosciences(Beijing), Beijing 100083, China
第一作者单位中国科学院水利部成都山地灾害与环境研究所
通讯作者单位中国科学院水利部成都山地灾害与环境研究所
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Liu, Jiankang,Cheng, Zunlan,Zhang, Xiaogang,et al. Influence of debris flow on channel evolution[C]//R. Genevos, D.L. Hamlion, A. Prestinuizi:American Society of Civil Engineers (ASCE),2011:231-236.
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