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Wind and Structures
  Volume 12, Number 6, November 2009 , pages 553-574

Field monitoring of boundary layer wind characteristics in urban area
Q.S. Li, Lunhai Zhi and Fei Hu

    This paper presents statistical analysis results of wind speed and atmospheric turbulence data measured from more than 30 anemometers installed at 15 different height levels on 325 m high Beijing Meteorological Tower and is primarily intended to provide useful information on boundary layer wind characteristics for wind-resistant design of tall buildings and high-rise structures. Profiles of mean wind speed are presented based on the field measurements and are compared with empirical models\' predictions. Relevant parameters of atmospheric boundary layer at urban terrain are determined from the measured wind speed profiles. Furthermore, wind velocity data in longitudinal, lateral and vertical directions, which were recorded from an ultrasonic anemometer during windstorms, are analyzed and discussed. Atmospheric turbulence information such as turbulence intensity, gust factor, turbulence integral length scale and power spectral densities of the three-dimensional fluctuating wind velocity are presented and used to evaluate the adequacy of existing theoretical and empirical models. The objective of this study is to investigate the profiles of mean wind speed and atmospheric turbulence characteristics over a typical urban area.
Key Words
    field measurement; boundary layer wind characteristic; wind speed profile; atmospheric turbulence; tall building design.
Q.S. Li; Department of Building and Construction, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
Lunhai Zhi; Department of Building and Construction, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong
, College of Civil Engineering, Hunan University, Changsha, Hunan 410082, PR China
Fei Hu; Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, PR China

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