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首页> 外文会议>25th Conference on Agricultural and Forest Meteorology and 12th Joint Conference on the Applications of Air Pollution Meteorology with Aamp;WMA and Fourth Symposium on the Urban Environment May 20-24, 2002 Norfolk, Virginia >TURBULENCE PROPERTIES OF THE STREET-ROOF SCALE WITHIN THE URBAN ROUGHNESS SUB-LAYER
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TURBULENCE PROPERTIES OF THE STREET-ROOF SCALE WITHIN THE URBAN ROUGHNESS SUB-LAYER

机译：城市粗糙度子层内街道尺度的湍流特性

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摘要

Air flow in the urban roughness sublayer is much more complex than its counterpart in the atmospheric surface layer. This is due to the much larger size of the roughness elements and the unevenly distributed heat sources. Thus, the use of surface layer similarity theory (SLST) for the parameterization of the mean flow is limited. Recent evidence from wind tunnel experiments indicates that the basic assumption of SLST, i.e., the constancy of momentum fluxes in the vicinity of the roughness elements, is not fulfilled, Kastner-Klein (2001), Ashie (2000). In both experiments a sharp maximum of the momentum flux was observed above the roughness elements. Kastner-Klein (2001) suggested that in spite of the inconstancy of the momentum flux, a logarithmic velocity law may be reproduced with u obtained from a single reference point. The aim of this paper is to investigate the momentum flux and the wind profile above the roof level in a real urban environment.
机译：城市粗糙度子层中的气流比大气表面层中的气流复杂得多。这是由于粗糙元件的尺寸大得多以及热源分布不均所致。因此，限制了将表层相似性理论（SLST）用于平均流的参数化。风洞实验的最新证据表明，SLST的基本假设（即在粗糙元素附近的动量通量恒定）无法实现，Kastner-Klein（2001），Ashie（2000）。在两个实验中，在粗糙度元素上方都观察到了最大的动量通量。 Kastner-Klein（2001）提出，尽管动量通量是不稳定的，但从单个参考点获得的u仍可以重现对数速度定律。本文的目的是研究真实城市环境中屋顶上方的动量通量和风廓线。

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