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Effects of Y-type spillway lateral contraction ratios on debris-flow patterns and scour features downriver of a check dam
Chen, Huayong1,2; Liu, Jinfeng1,2; Zhao, Wanyu1,2
Corresponding AuthorHuayong Chen
2016
Source PublicationNATURAL HAZARDS AND EARTH SYSTEM SCIENCES
ISSN1561-8633
Volume16Issue:11Pages:2433-2442
SubtypeArticle
Abstract

Debris flows often cause devastating damage to property and can injure or kill residents in mountainous areas. The construction of check dams in debris-flow valleys is considered a useful strategy for mitigating the damages downstream. In this paper, a new type of spillway structure with lateral contraction was proposed to distribute debris
flows after the check dam storage filled up. Four different lateral contraction ratios of the spillway were considered in experiments that investigated debris-flow patterns, scour characteristics, and energy dissipation rates when debris flows passed through the spillway. The results indicated that lateral contraction considerably influenced the extension of debris-flow nappes. The drop length of the nappe at  D0.7 ( means lateral contraction ratio) was approximately 1.4 times larger than at D0.4. The collision, friction,
and mixing forces between the debris-flow nappes and debris flows in downstream plunge pools dissipated much of the debris-flow kinetic energy, ranging from 42.03 to 78.08% at different contraction ratios. Additionally, based on a dimensionless
analysis, an empirical model was proposed to predict the maximum scour depth downriver of a check dam. It indicated that the results calculated by the model exhibited
good agreement with the experimental results.

; Debris flows often cause devastating damage to property and can injure or kill residents in mountainous areas. The construction of check dams in debris-flow valleys is considered a useful strategy for mitigating the damages downstream. In this paper, a new type of spillway structure with lateral contraction was proposed to distribute debris flows after the check dam storage filled up. Four different lateral contraction ratios of the spillway were considered in experiments that investigated debris-flow patterns, scour characteristics, and energy dissipation rates when debris flows passed through the spillway. The results indicated that lateral contraction considerably influenced the extension of debris-flow nappes. The drop length of the nappe at eta = 0.7 (eta means lateral contraction ratio) was approximately 1.4 times larger than at eta = 0.4. The collision, friction, and mixing forces between the debris-flow nappes and debris flows in downstream plunge pools dissipated much of the debris-flow kinetic energy, ranging from 42.03 to 78.08% at different contraction ratios. Additionally, based on a dimensionless analysis, an empirical model was proposed to predict the maximum scour depth downriver of a check dam. It indicated that the results calculated by the model exhibited good agreement with the experimental results.
KeywordCheck Dam Lateral Contraction Ratio Debris Flow Flow Pattern
Subject Area地理学 ; 水文学 ; 水利工程
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.5194/nhess-16-2433-2016
WOS Subject ExtendedGeology ; Meteorology & Atmospheric Sciences ; Water Resources
Indexed BySCI
WOS KeywordDOWNSTREAM
Language英语
Quartile3区
TOP
WOS SubjectGeosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS IDWOS:000389217000001
Funding OrganizationScience Technology Service Network Initiative, Chinese Academy of Sciences(KFJ-EW-STS-094) ; National Natural Science Foundation of China(51209195 ; Key Research Program of the Chinese Academy of Sciences(KZZD-EW-05-01) ; Key Laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Sciences ; 41190084)
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18004
Collection山地灾害与地表过程重点实验室
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, 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
Recommended Citation
GB/T 7714
Chen, Huayong,Liu, Jinfeng,Zhao, Wanyu. Effects of Y-type spillway lateral contraction ratios on debris-flow patterns and scour features downriver of a check dam[J]. NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,2016,16(11):2433-2442.
APA Chen, Huayong,Liu, Jinfeng,&Zhao, Wanyu.(2016).Effects of Y-type spillway lateral contraction ratios on debris-flow patterns and scour features downriver of a check dam.NATURAL HAZARDS AND EARTH SYSTEM SCIENCES,16(11),2433-2442.
MLA Chen, Huayong,et al."Effects of Y-type spillway lateral contraction ratios on debris-flow patterns and scour features downriver of a check dam".NATURAL HAZARDS AND EARTH SYSTEM SCIENCES 16.11(2016):2433-2442.
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