Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2016WR020203 |
High-resolution flow characterization close to the sediment-water interface in a run of the river reservoir | |
Brand, Andreas1,2; Noss, Christian3 | |
2017-05-01 | |
发表期刊 | WATER RESOURCES RESEARCH
![]() |
ISSN | 0043-1397 |
EISSN | 1944-7973 |
出版年 | 2017 |
卷号 | 53期号:5 |
文章类型 | Article |
语种 | 英语 |
国家 | Switzerland; Germany |
英文摘要 | A bistatic high-resolution acoustic profiler was used in order to characterize the lowermost boundary layer of a run of the river reservoir. The profiler allows determining the statistics of the three-dimensional flow field at a single point (sweet spot) as well as the measurement of the time averaged flow velocity profiles at 1 mm resolution around the sweet spot. Therefore, in addition to the flow statistics provided by single point acoustic Doppler profilers, mixing coefficients as well as production of turbulent kinetic energy can be calculated using a single device. Fitting of semiempirical relations to observed cospectra allowed eliminating artifacts as they result from coordinate system rotation during calculation of Reynolds stress profiles at millimeter resolution. While most parameters showed characteristics of a constant stress layer, length scales indicated anisotropy of the turbulent flow. Under these anisotropic near wall conditions, we found that the use of the commonly accepted Kolmogorov constants for the determination of dissipation rates using the inertial dissipation method is not valid any more. Instead, these constants vary with distance from the sediment water interface. We provide evidence that coefficients determined by numerical simulations are the appropriate choice also in field applications. In addition we resolved the viscous boundary layer close to the sediment-water interface in high resolution (1 mm) profiles and identified a double logarithmic layer above 1.5 cm at one location. The discrepancy of the scales as well as the double logarithmic layer suggests the existence of roughness elements upstream of the measurement sites. |
英文关键词 | bottom boundary layer sediment water interface acoustic profiler turbulence dissipation rates |
领域 | 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403712100045 |
WOS关键词 | BOTTOM BOUNDARY-LAYER ; VISCOUS SUBLAYER ; IN-SITU ; TURBULENCE MEASUREMENTS ; EDDY-CORRELATION ; SURFACE-LAYER ; CHANNEL FLOW ; OCEAN-FLOOR ; BED ; RESUSPENSION |
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/20099 |
专题 | 资源环境科学 |
作者单位 | 1.Eawag, Swiss Fed Inst Aquat Sci & Technol, Surface Waters Res & Management, Kastanienbaum, Switzerland; 2.Swiss Fed Inst Technol, Inst Biogeochem & Pollutant Dynam, Zurich, Switzerland; 3.Univ Koblenz Landau, Inst Environm Sci, Landau, Germany |
推荐引用方式 GB/T 7714 | Brand, Andreas,Noss, Christian. High-resolution flow characterization close to the sediment-water interface in a run of the river reservoir[J]. WATER RESOURCES RESEARCH,2017,53(5). |
APA | Brand, Andreas,&Noss, Christian.(2017).High-resolution flow characterization close to the sediment-water interface in a run of the river reservoir.WATER RESOURCES RESEARCH,53(5). |
MLA | Brand, Andreas,et al."High-resolution flow characterization close to the sediment-water interface in a run of the river reservoir".WATER RESOURCES RESEARCH 53.5(2017). |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论