Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR020186 |
Modeling complex flow structures and drag around a submerged plant of varied posture | |
Boothroyd, Richard J.1; Hardy, Richard J.1; Warburton, Jeff1; Marjoribanks, Timothy I.2 | |
2017-04-01 | |
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:4 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Although vegetation is present in many rivers, the bulk of past work concerned with modeling the influence of vegetation on flow has considered vegetation to be morphologically simple and has generally neglected the complexity of natural plants. Here we report on a combined flume and numerical model experiment which incorporates time-averaged plant posture, collected through terrestrial laser scanning, into a computational fluid dynamics model to predict flow around a submerged riparian plant. For three depth-limited flow conditions (Reynolds number = 65,000-110,000), plant dynamics were recorded through high-definition video imagery, and the numerical model was validated against flow velocities collected with an acoustic Doppler velocimeter. The plant morphology shows an 18% reduction in plant height and a 14% increase in plant length, compressing and reducing the volumetric canopy morphology as the Reynolds number increases. Plant shear layer turbulence is dominated by Kelvin-Helmholtz type vortices generated through shear instability, the frequency of which is estimated to be between 0.20 and 0.30 Hz, increasing with Reynolds number. These results demonstrate the significant effect that the complex morphology of natural plants has on in-stream drag, and allow a physically determined, species-dependent drag coefficient to be calculated. Given the importance of vegetation in river corridor management, the approach developed here demonstrates the necessity to account for plant motion when calculating vegetative resistance. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403682600021 |
WOS关键词 | TURBULENT-FLOW ; RIPARIAN VEGETATION ; AIR-FLOW ; RIVER ; RECONFIGURATION ; RESISTANCE ; ROUGHNESS ; TRANSPORT ; FOLIAGE ; FORCE |
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/21546 |
专题 | 资源环境科学 |
作者单位 | 1.Univ Durham, Dept Geog, Durham, England; 2.Loughborough Univ, Sch Civil & Bldg Engn, Loughborough, Leics, England |
推荐引用方式 GB/T 7714 | Boothroyd, Richard J.,Hardy, Richard J.,Warburton, Jeff,et al. Modeling complex flow structures and drag around a submerged plant of varied posture[J]. WATER RESOURCES RESEARCH,2017,53(4). |
APA | Boothroyd, Richard J.,Hardy, Richard J.,Warburton, Jeff,&Marjoribanks, Timothy I..(2017).Modeling complex flow structures and drag around a submerged plant of varied posture.WATER RESOURCES RESEARCH,53(4). |
MLA | Boothroyd, Richard J.,et al."Modeling complex flow structures and drag around a submerged plant of varied posture".WATER RESOURCES RESEARCH 53.4(2017). |
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