Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR019662 |
A numerical investigation into the importance of bed permeability on determining flow structures over river dunes | |
Sinha, Sumit1; Hardy, Richard J.1; Blois, Gianluca2; Best, James L.3,4,5,6; Smith, Gregory H. Sambrook7 | |
2017-04-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | Although permeable sediments dominate the majority of natural environments past work concerning bed form dynamics has considered the bed to be impermeable, and has generally neglected flow between the hyporheic zone and boundary layer. Herein, we present results detailing numerically modeled flow which allow the effects of bed permeability on bed form dynamics to be assessed. Simulation of an isolated impermeable bed form over a permeable bed shows that flow is forced into the bed upstream of the dune and returns to the boundary layer at the leeside, in the form of returning jets that generate horseshoe-shaped vortices. The returning flow significantly influences the leeside flow, modifying the separation zone, lifting the shear layer adjoining the separation zone away from the bed. Simulation of a permeable dune on a permeable bed reveals even greater modifications as the flow through the dune negates the formation of any flow separation in the leeside. With two dunes placed in series the flow over the downstream dune is influenced by the developing boundary layer on the leeside of the upstream dune. For the permeable bed case, the upwelling flow lifts the separated flow from the bed, modifies the shear layer through the coalescence with vortices generated, and causes the shear layer to undulate rather than be parallel to the bed. These results demonstrate the significant effect that bed permeability has on the flow over bed forms that may be critical in affecting the flux of water and nutrients. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403682600032 |
WOS关键词 | SUBSURFACE WATER EXCHANGE ; SAND-GRAVEL MIXTURES ; TURBULENT-FLOW ; SEDIMENT TRANSPORT ; HYPORHEIC EXCHANGE ; SHEAR-STRESS ; CONVECTIVE-TRANSPORT ; BOUNDARY-LAYER ; MEAN FLOW ; FORMS |
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/21826 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Durham, Dept Geog, Durham, England; 2.Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA; 3.Univ Illinois, Dept Geol Geog & GIS, Urbana, IL USA; 4.Univ Illinois, Dept Mech Sci, Urbana, IL USA; 5.Univ Illinois, Dept Engn, Urbana, IL USA; 6.Univ Illinois, Ven Te Chow Hydrosyst Lab, Urbana, IL USA; 7.Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham, W Midlands, England |
推荐引用方式 GB/T 7714 | Sinha, Sumit,Hardy, Richard J.,Blois, Gianluca,et al. A numerical investigation into the importance of bed permeability on determining flow structures over river dunes[J]. WATER RESOURCES RESEARCH,2017,53(4). |
APA | Sinha, Sumit,Hardy, Richard J.,Blois, Gianluca,Best, James L.,&Smith, Gregory H. Sambrook.(2017).A numerical investigation into the importance of bed permeability on determining flow structures over river dunes.WATER RESOURCES RESEARCH,53(4). |
MLA | Sinha, Sumit,et al."A numerical investigation into the importance of bed permeability on determining flow structures over river dunes".WATER RESOURCES RESEARCH 53.4(2017). |
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