Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR022811 |
Predicting Bed Shear Stresses in Vegetated Channels | |
Etminan, Vahid1,2,3; Ghisalberti, Marco1,4; Lowe, Ryan J.2,3,5,6 | |
2018-11-01 | |
发表期刊 | WATER RESOURCES RESEARCH |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2018 |
卷号 | 54期号:11页码:9187-9206 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | Shear stresses on vegetated beds play an important role in driving a wide range of processes at the sediment-water interface, including sediment transport. Existing methods for the estimation of bed shear stress are not applicable to vegetated beds due to the significant alteration of the near-bed velocity profile and turbulence intensities by the vegetation. In addition, bed shear stress distributions are highly spatially variable in the presence of vegetation. In this study, computational fluid dynamics simulations were used to investigate the spatial variability of bed shear stresses in the presence of emergent vegetation (modeled as arrays of circular cylinders) and the variation of bed stress with characteristics of both the bulk flow and the array. A recently proposed model that assumes a linear variation of stress in the viscous layer immediately above the bed is shown to be a reliable tool for estimating the spatially averaged bed shear stress over a wide range of flow conditions and vegetation densities. However, application of this model is found to be restrictive due to the lack of a reliable predictive tool for the thickness of the viscous layer. Based on a balance between turbulent kinetic energy production in the vegetation stem wakes and the viscous dissipation of turbulent kinetic energy at the bed, an enhanced formulation is proposed to predict the thickness of the viscous layer, which significantly improves the accuracy of model predictions. This improved model enhances the predictive capability for important benthic processes (such as sediment transport) in vegetated aquatic systems. |
英文关键词 | bed shear stress aquatic vegetation turbulent kinetic energy |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000453369400035 |
WOS关键词 | LARGE-EDDY SIMULATION ; CIRCULAR-CYLINDER ; TURBULENT-FLOW ; DRAG ; SCOUR ; ARRAY |
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/21974 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Western Australia, Sch Civil Environm & Min Engn, Perth, WA, Australia; 2.Univ Western Australia, Oceans Grad Sch, Perth, WA, Australia; 3.Univ Western Australia, Sch Earth Sci, Perth, WA, Australia; 4.Univ Melbourne, Dept Infrastruct Engn, Parkville, Vic, Australia; 5.Univ Western Australia, UWA Oceans Inst, Perth, WA, Australia; 6.Univ Western Australia, ARC Ctr Excellence Coral Reef Studies, Perth, WA, Australia |
推荐引用方式 GB/T 7714 | Etminan, Vahid,Ghisalberti, Marco,Lowe, Ryan J.. Predicting Bed Shear Stresses in Vegetated Channels[J]. WATER RESOURCES RESEARCH,2018,54(11):9187-9206. |
APA | Etminan, Vahid,Ghisalberti, Marco,&Lowe, Ryan J..(2018).Predicting Bed Shear Stresses in Vegetated Channels.WATER RESOURCES RESEARCH,54(11),9187-9206. |
MLA | Etminan, Vahid,et al."Predicting Bed Shear Stresses in Vegetated Channels".WATER RESOURCES RESEARCH 54.11(2018):9187-9206. |
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