Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026217 |
Density Effects at a Concordant Bed Natural River Confluence | |
Horna-Munoz, Daniel1,2,3; Constantinescu, George1,2; Rhoads, Bruce4; Lewis, Quinn5; Sukhodolov, Alexander6 | |
2020-04-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2020 |
卷号 | 56期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peru; Canada; Germany |
英文摘要 | Confluences are locations of complex hydrodynamic conditions within river systems. The effects on hydrodynamics and mixing of temperature-induced density differences between incoming flows are investigated at a small-size, concordant bed confluence. To evaluate density effects, results of eddy-resolving simulations for a densimetric Froude number Fr = 4.9 (weak-density-effects cases) and Fr = 1.6 (strong-density-effects cases) are compared to results of simulations in which the densities of the incoming flows do not differ (no-density-effects cases). Flow patterns predicted for both weak- and strong-density-effects cases show that secondary flow develops with increasing distance from the confluence apex. The pattern of secondary flow is characterized by denser fluid on one side of the confluence moving near the bed toward the side of the downstream channel corresponding to the less dense fluid and the less dense fluid moving near the free surface in the opposite direction. This pattern of fluid motion is similar to a spatially evolving lock-exchange cross flow. In the strong-density-effects simulations, a cross-stream cell of secondary flow develops at the density interface between the flows, similar to interfacial billows generated in classical lock-exchange flows. Density effects increase global mixing with respect to corresponding no-density-effects cases regardless of whether the high-momentum stream contains the higher-density fluid or the lower-density fluid. When density effects are weak, the lock-exchange mechanism either reinforces the pattern of mixing associated with secondary flow induced by inertial forces, particularly helical motion, or opposes this pattern of mixing, depending on which tributary contains the denser fluid. When density effects are strong, flow from the upstream channel with the denser fluid moves under the flow from the upstream channel with the less dense fluid. Key Points Weak and strong density effects lead to the development of secondary flow with increasing distance from the confluence apex Density difference between the incoming fluids affects the size of the stagnation zone and the type and coherence of MI billows For high densimetric Froude numbers a new type of cross-stream cell of secondary flow are generated |
英文关键词 | river confluences mixing layers density effects |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000538987800011 |
WOS关键词 | 2-DIMENSIONAL FLOW STRUCTURE ; STREAM CONFLUENCE ; LSPIV MEASUREMENTS ; PLANFORM GEOMETRY ; TURBULENT-FLOW ; DYNAMICS ; VELOCITY ; CHANNELS ; DOWNSTREAM ; MORPHOLOGY |
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/280628 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Iowa, Dept Civil & Environm Engn, Iowa City, IA 52242 USA; 2.Univ Iowa, IIHR Hydrosci & Engn, Iowa City, IA 52242 USA; 3.Univ Ingn & Tecnol UTEC, Dept Environm Engn, Ctr Invest & Tecnol Agua CITA, Lima, Peru; 4.Univ Illinois, Dept Geog & Geog Informat Sci, Urbana, IL USA; 5.Univ Waterloo, Dept Geog & Environm Management, Waterloo, ON, Canada; 6.Inst Freshwater Ecol & Inland Fisheries, Dept Ecohydrol, Berlin, Germany |
推荐引用方式 GB/T 7714 | Horna-Munoz, Daniel,Constantinescu, George,Rhoads, Bruce,et al. Density Effects at a Concordant Bed Natural River Confluence[J]. WATER RESOURCES RESEARCH,2020,56(4). |
APA | Horna-Munoz, Daniel,Constantinescu, George,Rhoads, Bruce,Lewis, Quinn,&Sukhodolov, Alexander.(2020).Density Effects at a Concordant Bed Natural River Confluence.WATER RESOURCES RESEARCH,56(4). |
MLA | Horna-Munoz, Daniel,et al."Density Effects at a Concordant Bed Natural River Confluence".WATER RESOURCES RESEARCH 56.4(2020). |
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