Study on the downcutting rate of a debris flow dam based on grain-size distribution

doi:10.1016/j.geomorph.2021.107891

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

	Study on the downcutting rate of a debris flow dam based on grain-size distribution
	Ruan, Hechun 2,3; Chen, Huayong 1,2,3; Li, Yong 2,3; Chen, Jiangang 2,3; Li, Huibin 2,3
刊名	GEOMORPHOLOGY
	2021-10-15
卷号	391 页码:9
关键词	Debris flow dams Overtopping failure Grain-size distribution Downcutting rate
ISSN号	0169-555X
DOI	10.1016/j.geomorph.2021.107891
英文摘要	Though widespread in disaster-prone areas, debris flow dams have unique characteristics in their formation and failure. An accurate description of their failure is the prerequisite to predict the dam-break floods, although little has been done in this research area. This paper describes the longitudinal evolution processes of a debris flow dam with 15 different grain-size distributions through flume tests, and put forward the formula of the downcutting rate for the whole process of overtopping failure. Results have shown that, according to the longitudinal evolution characteristics of the debris flow dam failure, the breach process can be divided into three stages: the formation of a retrogressive scarp, the erosion of the retrogressive scarp, and its decline stage. When the dam overtops and breaches, the downcutting rate for the whole evolution process can be expressed as E = k v sin(0.85 + theta)(3), where E is the erosion rate, v and theta are the flow velocity and the longitudinal slope of the breach respectively, and k is the erosion rate coefficient. The larger the value of the erosion rate coefficient k is, the faster the erosion rate E is. The minimum correlation coefficient R-2 between the calculated and the measured erosion rates is 0.73. In addition, the relationship among erosion rate coefficient k, grain-size distribution parameters mu, and D-c is also proposed, and the correlation coefficient R-2 reaches 0.965. The results provide an important theoretical basis for the prediction of debris flow dam-break floods, which can facilitate evidence-based decision-making in disaster prevention and mitigation. (C) 2021 Elsevier B.V. All rights reserved.
资助项目	Strategic Pilot Project of Science and Technology of CAS[XDA23090000] ; National Natural Science Foundation of China[41731283] ; Key Research Program of Frontier Sciences, CAS[SSW-DQC006] ; CAS Light of West China Program
WOS关键词	LAKE OUTBURST FLOOD ; LANDSLIDE DAM ; RIVER BLOCKING ; EROSION ; FAILURE ; SIMULATION ; PREDICTION ; PROVINCE ; MODEL
WOS研究方向	Physical Geography ; Geology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000696636700005
资助机构	Strategic Pilot Project of Science and Technology of CAS ; National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; CAS Light of West China Program
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/56234]
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	Chen, Huayong
作者单位	1.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, CAS Inst Mt Hazards & Environm, Key Lab Mt Hazards & Surface Proc, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Ruan, Hechun,Chen, Huayong,Li, Yong,et al. Study on the downcutting rate of a debris flow dam based on grain-size distribution[J]. GEOMORPHOLOGY,2021,391:9.
APA	Ruan, Hechun,Chen, Huayong,Li, Yong,Chen, Jiangang,&Li, Huibin.(2021).Study on the downcutting rate of a debris flow dam based on grain-size distribution.GEOMORPHOLOGY,391,9.
MLA	Ruan, Hechun,et al."Study on the downcutting rate of a debris flow dam based on grain-size distribution".GEOMORPHOLOGY 391(2021):9.