Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026686 |
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
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
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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