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Laboratory experiments on failure characteristics of non-cohesive sediment natural dam in progressive failure mode
Jiang, Xiangang1; Wei, Yunwei1; Wu, Lei1; Hu, Kaiheng2; Zhu, Zhanyuan1; Zou, Zuyin1; Xiao, Weimin1
Corresponding AuthorJiang, Xiangang(jxgjim@163.com)
2019-09-01
Source PublicationENVIRONMENTAL EARTH SCIENCES
ISSN1866-6280
Volume78Issue:17Pages:14
AbstractNatural dam failure may cause disastrous floods in the downstream, especially for dam outbursts in progressive failure mode. Until now researches about the characteristics of progressive failure are still completely unclear. In this paper, a series of flume tests were conducted to investigate the formation mechanism of progressive failure of natural dam, the breaching characteristics and the effect of outburst flood on the channel bed. According to the results, three typical features in the progressive failure process of natural dams were observed: seepage on downstream slope, slide of the downstream slope and overtopping. With phreatic line rising continuously, seepage occurred on the downstream slope, which caused slide of downstream slope of the dam. The breaching discharge hydrographs were asymmetric on both sides of peak discharge, which was similar to the breaching discharge of overtopping. The relationship between breach width and depth was like a shape of "S", which followed a logistic function. In the breaching process, sediment in the channel bed near the dam was first deposited and then scoured, where the flow velocity was large with strong turbulence; while flow on channel bed far away from the dam showed lower velocity and the flow regime transferred from supercritical flow to subcritical flow. Sediment deposited at first and then scoured gradually on channel bed, but only deposited at a large distance from the dam. The outburst flood eroded the channel bed continuously, the erosion mechanism was from tractive erosion to backward erosion, and returned to tractive erosion finally. In addition, the further away from the dam, the weaker the erosion intensity was. The results of this paper enriched the understanding of the failure mechanism of progressively outburst natural dam, which is helpful to predict breaching parameters in progressive failure mode and to provide some reference about flood prevention.
KeywordNatural dam Progressive failure Breaching characteristics Flume tests
DOI10.1007/s12665-019-8544-1
Indexed BySCI
WOS KeywordLANDSLIDE DAM ; WENCHUAN EARTHQUAKE ; DEBRIS FLOW
Language英语
Funding ProjectNational Natural Science Foundation of China[41807289] ; Sichuan province fundamental scientific research[18ZA0374] ; Chinese Academy of Sciences[KLMHESP-17-05]
WOS Research AreaEnvironmental Sciences & Ecology ; Geology ; Water Resources
WOS SubjectEnvironmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000482242000002
Funding OrganizationNational Natural Science Foundation of China ; Sichuan province fundamental scientific research ; Chinese Academy of Sciences
PublisherSPRINGER
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Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/26959
Collection山地灾害与地表过程重点实验室
Corresponding AuthorJiang, Xiangang
Affiliation1.Sichuan Agr Univ, Coll Civil Engn, Chengdu 611830, Sichuan, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, Chengdu 610044, Sichuan, 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
Jiang, Xiangang,Wei, Yunwei,Wu, Lei,et al. Laboratory experiments on failure characteristics of non-cohesive sediment natural dam in progressive failure mode[J]. ENVIRONMENTAL EARTH SCIENCES,2019,78(17):14.
APA Jiang, Xiangang.,Wei, Yunwei.,Wu, Lei.,Hu, Kaiheng.,Zhu, Zhanyuan.,...&Xiao, Weimin.(2019).Laboratory experiments on failure characteristics of non-cohesive sediment natural dam in progressive failure mode.ENVIRONMENTAL EARTH SCIENCES,78(17),14.
MLA Jiang, Xiangang,et al."Laboratory experiments on failure characteristics of non-cohesive sediment natural dam in progressive failure mode".ENVIRONMENTAL EARTH SCIENCES 78.17(2019):14.
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