Determination of aerodynamic parameters of urban surfaces: methods and results revisited

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• 作者：A. F. Mohammad ; S. A. Zaki ; A. Hagishima…
• 刊名：Theoretical and Applied Climatology
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：122
• 期：3-4
• 页码：635-649
• 全文大小：784 KB
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• 作者单位：A. F. Mohammad (1)
  S. A. Zaki (1)
  A. Hagishima (2)
  M. S. M. Ali (1)
  
  1. Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia Kuala Lumpur, Jalan Semarak, 54100, Kuala Lumpur, Malaysia
  2. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1, Kasuga-koen, Kasuga, Fukuoka, 816-8580, Japan
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Meteorology and Climatology
  Atmospheric Protection, Air Quality Control and Air Pollution
  Climate Change
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  
• 出版者：Springer Wien
• ISSN：1434-4483

文摘

Estimates of aerodynamic parameters, in particular roughness length z ₀ and displacement height d, are important for the analysis of the roughness of an urban surface, which affects processes that occur within the urban boundary layer such as pollutant dispersion and urban ventilation. Findings regarding the aerodynamic effects of various configurations of urban arrays were compiled from various studies. Several experimental, numerical and semi-empirical studies to estimate z ₀ and d were reviewed and compared with each other. The results can be summarized as follows: (1) the influence of the frontal area index (λ _f ) on z ₀ is significant and their relationship has been confirmed by both experimental and numerical data; (2) compared to one-parameter and two-parameter fitting methods, the three-parameter fitting method is the least accurate; (3) the physical meaning of d remains vague because its definition as the height where surface drag acts may not be accurate for sharp-edged roughness blocks and (4) the peak values of z ₀ for uniform and heterogeneous block heights indicate presence of skimming or wake-interference flow effects, which may influence surface roughness. Finally, the semi-empirical models were found to be limited to cases derived from available experimental data, which normally involve uniform arrays of cubes.