DOI: 10.1002/2015GL067148
论文题名: Direct measurement of hairpin-like vortices in the bottom boundary layer of the coastal ocean
作者: Steele E.C.C. ; Nimmo-Smith W.A.M. ; Vlasenko A.
刊名: Geophysical Research Letters
ISSN: 0094-9384
EISSN: 1944-9115
出版年: 2016
卷: 43, 期: 3 起始页码: 1175
结束页码: 1183
语种: 英语
英文关键词: 3D-PTV
; bottom boundary layers
; coherent vortical structures
; hairpin vortex packets
; ocean
; turbulence
Scopus关键词: Atmospheric thermodynamics
; Boundary layer flow
; Boundary layers
; Oceanography
; Reynolds number
; Turbulence
; 3D-PTV
; Bottom boundary layer
; Hairpin vortex packets
; Ocean
; Vortical structures
; Vortex flow
; Antarctic Bottom Water
; benthic boundary layer
; bottom water
; coastal zone
; dispersion
; laboratory method
; numerical model
; particle motion
; Reynolds number
; seafloor
; turbulence
; vorticity
; Peru tomato mosaic virus
英文摘要: Laboratory measurements and numerical modeling at low Reynolds numbers (Reθ<7700) indicate the energy-containing turbulence of boundary layer flows comprises coherent packets of hairpin vortices. Here direct measurements in the bottom boundary layer of the coastal ocean at higher Reynolds numbers (Reθ = 266,150) show tidal flows also contain packets of large vortices separated by periods of more quiescent conditions. The 1452 vortices recorded within a 20 min period are typically aligned along stream (∼8.0° from the mean flow direction) and inclined to the horizontal (∼27.0° from the seabed), with a mean period of occurrence of 4.3 s. These results lend three-dimensional, in situ support to an interpretation of the coastal ocean bottom boundary layer as comprising coherent packets of hairpin vortices. This demonstrates a direct linkage from low Reynolds number experiments to higher Reynolds number flows, permitting fine-scale details of particle transport and pollutant dispersion to be inferred from lower Reynolds number data. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959516960&doi=10.1002%2f2015GL067148&partnerID=40&md5=54ff4bdf16fe7f592d9707836850c1ba
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10347
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: School of Marine Science and Engineering, Plymouth University, Plymouth, United Kingdom
Recommended Citation:
Steele E.C.C.,Nimmo-Smith W.A.M.,Vlasenko A.. Direct measurement of hairpin-like vortices in the bottom boundary layer of the coastal ocean[J]. Geophysical Research Letters,2016-01-01,43(3).