Wind and Structures

Techno-Press (테크노프레스)
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Field monitoring of boundary layer wind characteristics in urban area

  • Li, Q.S. (Department of Building and Construction, City University of Hong Kong) ;
  • Zhi, Lunhai (Department of Building and Construction, City University of Hong Kong) ;
  • Hu, Fei (Institute of Atmospheric Physics, Chinese Academy of Sciences)
  • Received : 2008.12.08
  • Accepted : 2009.08.24
  • Published : 2009.11.25
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Abstract

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.

Keywords

Acknowledgement

Supported by : Committee of City University of Hong Kong

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