Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018WR024493 |
Effects of Roughness Reynolds Number on Scalar Transfer Mechanisms at the Sediment-Water Interface | |
He, G. J.1; Han, X.1; Fang, H. W.1; Reible, D.2; Huang, L.1 | |
2019-08-01 | |
发表期刊 | WATER RESOURCES RESEARCH
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ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2019 |
卷号 | 55期号:8页码:6811-6824 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA |
英文摘要 | The passive scalar transport across a sediment-water interface (SWI) is of fundamental importance to river environments. A model for scalar transfer from water to organic sediment bed is developed. The bed is formed by packed particles so that combined effect of permeability and roughness can be considered. Large-eddy simulation is used to get spatial and temporal information. The numerical results are compared to data from laboratory experiments, which stress the importance of considering bed roughness to better characterize the turbulent diffusion across the SWI. From the smooth regime to the transitionally regime, the turbulent diffusion exceeds the molecular diffusion and the dominating role at the interface changes from molecular diffusion to turbulent diffusion. In the completely rough regime, the molecular diffusive flux can be ignored compared with the turbulent flux. Moreover, turbulent Schmidt number is found to be higher near the SWI and lower around the middle of flow depth, ranging from 0.5 to 1. The results will be helpful to design the parameterization for the scalar transport over streams, rivers, or coastal areas where flow near the bed surface is relatively high and hyporheic exchange is affected by roughness and bed permeability. |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490973700026 |
WOS关键词 | DISSOLVED-OXYGEN TRANSFER ; DIFFUSIONAL MASS-TRANSFER ; LARGE-EDDY SIMULATION ; TURBULENT PRANDTL ; SCHMIDT NUMBER ; BOUNDARY-LAYER ; TRANSPORT ; PERMEABILITY ; CHANNEL ; BED |
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/185866 |
专题 | 资源环境科学 |
作者单位 | 1.Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydro Sci & Engn, Beijing, Peoples R China; 2.Texas Tech Univ, Dept Civil & Environm Engn, Lubbock, TX 79409 USA |
推荐引用方式 GB/T 7714 | He, G. J.,Han, X.,Fang, H. W.,et al. Effects of Roughness Reynolds Number on Scalar Transfer Mechanisms at the Sediment-Water Interface[J]. WATER RESOURCES RESEARCH,2019,55(8):6811-6824. |
APA | He, G. J.,Han, X.,Fang, H. W.,Reible, D.,&Huang, L..(2019).Effects of Roughness Reynolds Number on Scalar Transfer Mechanisms at the Sediment-Water Interface.WATER RESOURCES RESEARCH,55(8),6811-6824. |
MLA | He, G. J.,et al."Effects of Roughness Reynolds Number on Scalar Transfer Mechanisms at the Sediment-Water Interface".WATER RESOURCES RESEARCH 55.8(2019):6811-6824. |
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