Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR023421 |
Effects of Turbulent Hyporheic Mixing on Reach-Scale Transport | |
Roche, K. R.1,2; Li, A.1; Bolster, D.2; Wagner, G. J.3; Packman, A. I.1 | |
2019-05-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:5页码:3780-3795 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Turbulence causes rapid mixing of solutes and fine particles between open channel flow and coarse-grained streambeds. Turbulent mixing is known to control hyporheic exchange fluxes and the distribution of vertical mixing rates in the streambed, but it is unclear how turbulent mixing ultimately influences mass transport at the reach scale. We used a particle-tracking model to simulate local- and reach-scale solute transport for a stream with coarse-grained sediments. Simulations were first used to determine profiles of vertical mixing rates that best described solute concentration profiles measured within a coarse granular bed in flume experiments. These vertical mixing profiles were then used to simulate a pulse solute injection to show the effects of turbulent hyporheic exchange on reach-scale solute transport. Experimentally measured concentrations were best described by simulations with a nonmonotonic mixing profile, with highest mixing at the sediment-water interface and exponential decay into the bed. Reach-scale simulations show that this enhanced interfacial mixing couples in-stream and hyporheic solute transport. Coupling produces an interval of exponential decay in breakthrough curves and delays the onset of power law tailing. High streamwise velocities in the hyporheic zone reduce mass recovery in the water column and cause breakthrough curves to exhibit steeper power law slopes than predictions from mobile-immobile modeling theory. These results demonstrate that transport models must consider the spatial variability of streamwise velocity and vertical mixing for both the stream and the hyporheic zone, and new analytical theory is needed to describe reach-scale transport when high streamwise velocities are present in the hyporheic zone. |
英文关键词 | hyporheic exchange turbulence transport stream CTRW solute |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000474848500010 |
WOS关键词 | SOLUTE TRANSPORT ; TRANSIENT STORAGE ; EXCHANGE PROCESSES ; BED PERMEABILITY ; CHANNEL FLOW ; POROUS BED ; STREAM ; ZONE ; MODEL ; WATER |
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/183118 |
专题 | 资源环境科学 |
作者单位 | 1.Northwestern Univ, Dept Civil & Environm Engn, Evanston, IL 60208 USA; 2.Univ Notre Dame, Dept Civil & Environm Engn & Earth Sci, Notre Dame, IN 46556 USA; 3.Northwestern Univ, Dept Mech Engn, Evanston, IL 60208 USA |
推荐引用方式 GB/T 7714 | Roche, K. R.,Li, A.,Bolster, D.,et al. Effects of Turbulent Hyporheic Mixing on Reach-Scale Transport[J]. WATER RESOURCES RESEARCH,2019,55(5):3780-3795. |
APA | Roche, K. R.,Li, A.,Bolster, D.,Wagner, G. J.,&Packman, A. I..(2019).Effects of Turbulent Hyporheic Mixing on Reach-Scale Transport.WATER RESOURCES RESEARCH,55(5),3780-3795. |
MLA | Roche, K. R.,et al."Effects of Turbulent Hyporheic Mixing on Reach-Scale Transport".WATER RESOURCES RESEARCH 55.5(2019):3780-3795. |
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