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DOI | 10.1175/JAS-D-17-0153.1 |
Large-Eddy Simulation Study of Log Laws in a Neutral Ekman Boundary Layer | |
Jiang, Qingfang1; Wang, Shouping1; Sullivan, Peter2 | |
2018-06-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:6页码:1873-1889 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The characteristics of wind profiles in a neutral atmospheric boundary layer and their dependence on the geostrophic wind speed U-g, Coriolis parameter f, and surface roughness length z(0) are examined utilizing largeeddy simulations. These simulations produce a constant momentum flux layer and a log-law layer above the surface characterized by a logarithmic increase of wind speed with height. The von Karman constant derived from the mean wind profile is around 0.4 over a wide range of control parameters. The depths of the simulated boundary layer, constant-flux layer, and surface log-law layer tend to increase with the wind speed and decrease with an increasing Coriolis parameter. Immediately above the surface log-law layer, a second log-law layer has been identified from these simulations. The depth of this upper log-law layer is comparable to its counterpart in the surface layer, and the wind speed can be scaled as u(*)(u(*)/fh)(3/4), as opposed to just u(*) in the surface log-law layer, implying that in addition to surface processes, the upper log-law layer is also influenced by Earth's rotation and large-scale conditions. Here u(*) is the friction velocity at the surface, and h is the boundary layer depth. An analytical model is proposed to assist in the interpretation of the log laws in a typical Ekman boundary layer. The physics and implications of the upper log-law layer are discussed. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000434942300007 |
WOS关键词 | DIRECT NUMERICAL-SIMULATION ; OBUKHOV SIMILARITY THEORY ; SURFACE-LAYER ; TURBULENCE ; WIND ; PROFILE ; MODELS ; FLOW |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/29582 |
专题 | 地球科学 |
作者单位 | 1.Naval Res Lab, Monterey, CA 93943 USA; 2.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA |
推荐引用方式 GB/T 7714 | Jiang, Qingfang,Wang, Shouping,Sullivan, Peter. Large-Eddy Simulation Study of Log Laws in a Neutral Ekman Boundary Layer[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(6):1873-1889. |
APA | Jiang, Qingfang,Wang, Shouping,&Sullivan, Peter.(2018).Large-Eddy Simulation Study of Log Laws in a Neutral Ekman Boundary Layer.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(6),1873-1889. |
MLA | Jiang, Qingfang,et al."Large-Eddy Simulation Study of Log Laws in a Neutral Ekman Boundary Layer".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.6(2018):1873-1889. |
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