Laboratory experiments on failure characteristics of non-cohesive sediment natural dam in progressive failure mode

doi:10.1007/s12665-019-8544-1

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Laboratory experiments on failure characteristics of non-cohesive sediment natural dam in progressive failure mode
	Jiang, Xiangang1 ; Wei, Yunwei 1; Wu, Lei 1; Hu, Kaiheng2 ; Zhu, Zhanyuan 1; Zou, Zuyin 1; Xiao, Weimin 1
刊名	ENVIRONMENTAL EARTH SCIENCES
	2019-09-01
卷号	78 期号:17 页码:14
关键词	Natural dam Progressive failure Breaching characteristics Flume tests
ISSN号	1866-6280
DOI	10.1007/s12665-019-8544-1
通讯作者	Jiang, Xiangang(jxgjim@163.com)
英文摘要	Natural 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.
资助项目	National Natural Science Foundation of China[41807289] ; Sichuan province fundamental scientific research[18ZA0374] ; Chinese Academy of Sciences[KLMHESP-17-05]
WOS关键词	LANDSLIDE DAM ; WENCHUAN EARTHQUAKE ; DEBRIS FLOW
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000482242000002
资助机构	National Natural Science Foundation of China ; Sichuan province fundamental scientific research ; Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26959]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Jiang, Xiangang
作者单位	1.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
推荐引用方式 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.