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Surface Roughness Around a 325-m Meteorological Tower and Its Effect on Urban Turbulence


doi: 10.1007/BF02918491

  • Based on slow-and fast-response measurements under neutral stratification conditions from a 325-m meteorological tower located in a built-up area of north-central Beijing as well as a descriptive survey of surface roughness elements (i.e., buildings and trees) around the tower site, urban roughness lengths,z0, with zero-plane displacement height are estimated using logarithmic wind profile and morphometric methods in eight 45° directional sectors. When comparing their results with each other, the slow-response method tends to give smaller z0 values. At a given location, considerable directional variations in values are observed. The effect of surface roughness on urban turbulence characteristics in terms of non-dimensional standard deviations of three-component velocity, σi/u*1 (where i = u, v, v and u*1 is local friction velocity),is investigated.
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Manuscript History

Manuscript received: 10 July 2005
Manuscript revised: 10 July 2005
通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Surface Roughness Around a 325-m Meteorological Tower and Its Effect on Urban Turbulence

  • 1. State Key Laboratory of Atmospheric Boundary-Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029;The Department of Atmospheric Sciences, College of Sciences, Al-Mustansiriya University, Ba,State Key Laboratory of Atmospheric Boundary-Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029

Abstract: Based on slow-and fast-response measurements under neutral stratification conditions from a 325-m meteorological tower located in a built-up area of north-central Beijing as well as a descriptive survey of surface roughness elements (i.e., buildings and trees) around the tower site, urban roughness lengths,z0, with zero-plane displacement height are estimated using logarithmic wind profile and morphometric methods in eight 45° directional sectors. When comparing their results with each other, the slow-response method tends to give smaller z0 values. At a given location, considerable directional variations in values are observed. The effect of surface roughness on urban turbulence characteristics in terms of non-dimensional standard deviations of three-component velocity, σi/u*1 (where i = u, v, v and u*1 is local friction velocity),is investigated.

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