GSTDTAP  > 资源环境科学
DOI10.1029/2019WR026686
Flow Resistance and Energy Dissipation in Supercritical Air-Water Flows Down Vegetated Chutes
Scheres, B.1; Schuettrumpf, H.1; Felder, S.2
2020-02-01
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2020
卷号56期号:2
文章类型Article
语种英语
国家Germany; Australia
英文摘要

Vegetation covers on dikes and embankment dams have proven as sustainable and cost-effective surface protection against external erosion caused by hydraulic, mechanical, or climatic impacts. Determination of the hydraulic loads that act upon these covers requires the knowledge of the flow resistance. While the high-velocity flows on vegetated slopes are often aerated, the flow aeration has rarely been considered, and no direct measurements of the air-water flow properties have been conducted to date. The air-water flow properties are needed for a direct estimation of important design parameters such as friction factors and residual head at the downstream end. Herein, unique air-water flow measurements were conducted in high-velocity air-water flows down a vegetated chute with a 1:3 slope. Several vegetation covers were tested for a range of flow rates. The experiments revealed strong flow aeration within three-dimensional, fragmented flows associated with complex interactions of vegetation and high-velocity flows. The air-water flow properties were measured with phase-detection intrusive probes providing novel insights into aerated flows on vegetated chutes including distributions of void fraction, bubble count rate, and interfacial velocity as well as direct estimates of energy dissipation and flow resistance. The results highlighted strong flow aeration and energy dissipation for all vegetated configurations. The median equivalent Darcy-Weisbach friction factors for all vegetations were within 0.19 to 0.45, comparable to aerated flows on stepped spillways. The present results highlighted the significant flow resistance of vegetated covers and the need to consider air-water flow properties in the design of vegetated chutes.


领域资源环境
收录类别SCI-E
WOS记录号WOS:000535672800062
WOS关键词OPEN-CHANNEL FLOW ; VELOCITY PROFILES ; STEPPED CHUTES ; OVERLAND-FLOW ; AERATION ; PROBES ; FLUME
WOS类目Environmental Sciences ; Limnology ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/280511
专题资源环境科学
作者单位1.Rhein Westfal TH Aachen, Inst Hydraul Engn & Water Resources Management, Aachen, Germany;
2.UNSW Sydney, Water Res Lab, Sch Civil & Environm Engn, Sydney, NSW 2052, Australia
推荐引用方式
GB/T 7714
Scheres, B.,Schuettrumpf, H.,Felder, S.. Flow Resistance and Energy Dissipation in Supercritical Air-Water Flows Down Vegetated Chutes[J]. WATER RESOURCES RESEARCH,2020,56(2).
APA Scheres, B.,Schuettrumpf, H.,&Felder, S..(2020).Flow Resistance and Energy Dissipation in Supercritical Air-Water Flows Down Vegetated Chutes.WATER RESOURCES RESEARCH,56(2).
MLA Scheres, B.,et al."Flow Resistance and Energy Dissipation in Supercritical Air-Water Flows Down Vegetated Chutes".WATER RESOURCES RESEARCH 56.2(2020).
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