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Characteristics, Causes and Hazards of Large-Scale Debris Flows on June 23 at Haitong Watershed, Tibet, China
Ge Yonggang1; Zou Qiang2; Zhang Jianqiang1; Guo Xiaojun1
Corresponding AuthorGe Yonggang
Author of SourceMikos, M ; Tiwari, B ; Yin, Y ; Sassa, K
meeting4th World Landslide Forum
Conference DateMAY 29-JUN 02, 2017
Conference PlaceLjubljana
Publication PlaceCHAM
Contribution Rank1
AbstractDebris flows seriously endanger the highway from Chengdu to Lhasa (G318)and often interrupt traffic in rain seasons, especially at the southeast of Tibet. A large-scale debris flow, occurred on June 23, 2012 at Haitong Watershed, blocked the Xiqu River and formed a dammed lake with the average width of 60 m, the length of 300 m and the reservoir volume of 90,000-100,000 m(3). The traffic of G318 Highway was interrupted until June 30th as the result that the highway base was buried about 230 m by debris flow deposits and inundated over 160 m by dammed lake. The investigation and the analysis of debris flow deposit samples showed that the debris flow delivered about 100,000 m(3) sediment out of watershed, deposited along Xiqu River and formed a dam with the length of 230 m, the width of 100 m and the average thickness of 7-8 m. The clay content and density of debris flow deposits was 0.41-0.86% and 1.89-2.01 t/m(3), respectively. Using the parameters of cross sections obtained by field measuring, the velocities and peak discharge for debris flow were estimated, and the velocities of flow reached 10.9-12.1 m/s by virtue of steep channel as well as the peak discharge at the mouth, the right gully and the left gully was 924, 642 and 336 m(3)/s, respectively. The debris flow on June 23 formed a hazard chain which was composed of flash flood, debris flow, dammed lake and outburst flood, and the threshold of debris flow blocking river was that the discharge, the magnitude and the deposits at river channel of debris flow was 230-850 m(3)/s, 11,709 and 9233 m(3). The active tectonic movement, abundant erosion deposits and steep geomorphology are responsible for debris flow formation, the rainstorm after long-period drought triggered debris flows and the sediments induced by channel deposits initiation at the lower of the watershed further supplied and enlarged debris flow. The highway risk were assessed using the model which was established based on dynamic mechanism, and the high-dangerous zone and middle-dangerous zone occupied 86.5%, which agreed with the actual, where were buried by debris flow deposits or submerged by the following dammed lake. Based on the hazards and risk of debris flows on June 23, the protection measures, including dangerous debris flow identification, risk assessment, rational route, integrated control and emergency plans, were recommended.
KeywordDebris flows Characteristics Causes Hazard assessment Haitong watershed
ISBN978-3-319-53485-5; 978-3-319-53484-8
Indexed ByCPCI
WOS IDWOS:000438668800067
Citation statistics
Document Type会议论文
Corresponding AuthorGe Yonggang
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China;
2.Southwest Univ Sci & Technol, Sch Environm & Resources, Mianyang 621010, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Ge Yonggang,Zou Qiang,Zhang Jianqiang,et al. Characteristics, Causes and Hazards of Large-Scale Debris Flows on June 23 at Haitong Watershed, Tibet, China[C]//Mikos, M, Tiwari, B, Yin, Y, Sassa, K. CHAM:SPRINGER INTERNATIONAL PUBLISHING AG,2017:581-592.
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