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DOI | 10.1002/2016WR018898 |
Estimating bed shear stress from remotely measured surface turbulent dissipation fields in open channel flows | |
Johnson, E. D.; Cowen, E. A. | |
2017-03-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:3 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Synoptic information on bed shear stress is necessary in predicting the transport of sediments and environmental contaminants in rivers and open channels. Existing methods of estimating bed shear stress typically involve measuring vertical profiles of streamwise velocity or Reynolds stress and taking advantage of the logarithmic or the constant stress region, respectively, to determine friction velocity and subsequently, bed shear stress. While effective, these methods yield local measurements of bed shear stress only. Direct measurements of bed shear stress can also be obtained through measurements with a drag plate. However, this method yields average shear stress information over the area of the plate and is impractical for large-scale implementation in the field. Here we present a method capable of providing continuous synoptic measurements of bed shear stress over a large field-of-view. A series of Large-Scale Particle Image Velocimetry (LSPIV) and Acoustic Doppler Velocimetry (ADV) measurements were made in a variety of flows generated in a wide-open channel facility. Turbulent dissipation is calculated on the free surface from the 2-D LSPIV results and is correlated with near-surface ADV measurements of turbulent dissipation in the water column. The ADV results are consistent with the Nezu (1977) established relationship for the vertical variation of turbulent dissipation in the water column. Knowledge of the correlation between free-surface and near-surface dissipation values coupled with Nezu's (1977) relationship allow a robust and accurate estimate of friction velocity to be made and subsequently, shear stress at the bed can be estimated. |
英文关键词 | bed shear stress turbulence dissipation remote sensing |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000400160500016 |
WOS关键词 | LOW-REYNOLDS-NUMBER ; BOUNDARY-LAYERS ; ROUGH-WALL ; SECONDARY CURRENTS ; KINETIC-ENERGY ; VELOCITY ; SMOOTH ; PATTERNS ; RIVER ; TANK |
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/22006 |
专题 | 资源环境科学 |
作者单位 | Cornell Univ, Sch Civil & Environm Engn, DeFrees Hydraul Lab, Ithaca, NY 14853 USA |
推荐引用方式 GB/T 7714 | Johnson, E. D.,Cowen, E. A.. Estimating bed shear stress from remotely measured surface turbulent dissipation fields in open channel flows[J]. WATER RESOURCES RESEARCH,2017,53(3). |
APA | Johnson, E. D.,&Cowen, E. A..(2017).Estimating bed shear stress from remotely measured surface turbulent dissipation fields in open channel flows.WATER RESOURCES RESEARCH,53(3). |
MLA | Johnson, E. D.,et al."Estimating bed shear stress from remotely measured surface turbulent dissipation fields in open channel flows".WATER RESOURCES RESEARCH 53.3(2017). |
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