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束流型拦砂坝溢流口及其关键参数确定
Alternative TitleExperimental investigation on the lateral contraction spillway and its key parameters determination
陈华勇1,2; 柳金峰1,2; 赵万玉1,2
Corresponding Author陈华勇
2016
Source Publication水科学进展
ISSN1001-6791
Volume27Issue:5Pages:1-10
Other Abstract

In order to modify the spillway structure of a check dam and specify the geometry parameters of the spillway,the debris-flow pattern,scour depth,and energy dissipation were discussed under the conditions of different bottom surfaces and lateral contraction ratios based on physical modeling experiments. According to the buried depth design criteria for check-dam foundations and critical equilibrium for nonviscous particles under water,the rational value of the lateral contraction ratio was also discussed. The results indicated that the scour hole with deep scour depth was
near the dam foundation when the spillway surface was a plate or curved surface with a large inclined angle. When a curved surface with a horizontal outlet was considered,not only was the scour depth decreased to some extent,but the distance between the plunging point and the dam toe was also enhanced. Generally,upon increasing the lateral contraction ratio,the energy dissipation rate increased due to the stronger interaction between the debris flows and erodible bed downstream if the debris-flow scales and spillway curvature were fixed. When the lateral contraction ratio was
in the range 0. 2—0. 6,the scour depth behind the check dam satisfied the engineering design. Meanwhile,the distance between the plunging point and the dam toe was reasonable. This study can provide some reference points for the design of debris-flow mitigation in the engineering of check dams.

;

In order to modify the spillway structure of a check dam and specify the geometry parameters of the spillway, the debris-flow pattern,scour depth,and energy dissipation were discussed under the conditions of different bottom surfaces and lateral contraction ratios based on physical modeling experiments. According to the buried depth design criteria for check-dam foundations and critical equilibrium for nonviscous particles under water,the rational value of the lateral contraction ratio was also discussed. The results indicated that the scour hole with deep scour depth was
near the dam foundation when the spillway surface was a plate or curved surface with a large inclined angle. When a curved surface with a horizontal outlet was considered,not only was the scour depth decreased to some extent,but the distance between the plunging point and the dam toe was also enhanced. Generally,upon increasing the lateral contraction ratio,the energy dissipation rate increased due to the stronger interaction between the debris flows and erodible bed downstream if the debris-flow scales and spillway curvature were fixed. When the lateral contraction ratio was
in the range 0. 2—0. 6,the scour depth behind the check dam satisfied the engineering design. Meanwhile,the distance between the plunging point and the dam toe was reasonable. This study can provide some reference points for the design of debris-flow mitigation in the engineering of check dams.

Keyword束流结构 拦砂坝 溢流口 流态 坝后冲刷
Subject AreaP642.23
DOI10.14042/j.cnki.32.1309.2016.05.012
Indexed ByEI ; CSCD ; 北大中文核心
Language中文
CSCD IDCSCD:5843511
Funding Organization中国科学院重点部署项目资助项目(KZZD-EW-05-01) ; 国家自然科学基金资助项目
Accession numberAccession number:20170703353660
Citation statistics
Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18009
Collection山地灾害与地表过程重点实验室
Affiliation1.中国科学院山地灾害与地表过程重点实验室
2.中国科学院水利部成都山地灾害与环境研究所
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
陈华勇,柳金峰,赵万玉. 束流型拦砂坝溢流口及其关键参数确定[J]. 水科学进展,2016,27(5):1-10.
APA 陈华勇,柳金峰,&赵万玉.(2016).束流型拦砂坝溢流口及其关键参数确定.水科学进展,27(5),1-10.
MLA 陈华勇,et al."束流型拦砂坝溢流口及其关键参数确定".水科学进展 27.5(2016):1-10.
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