Wind and Structures

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Determination of Urban Surface Aerodynamic Characteristics Using Marquardt Method

  • Zhang, Ning (School of Atmospheric Sciences, Nanjing University) ;
  • Jiang, Weimei (School of Atmospheric Sciences, Nanjing University) ;
  • Gao, Zhiqiu (State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences) ;
  • Hu, Fei (State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences) ;
  • Peng, Zhen (School of Atmospheric Sciences, Nanjing University)
  • Received : 2008.08.08
  • Accepted : 2009.04.03
  • Published : 2009.05.25
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Abstract

Marquardt method is used to estimate the aerodynamic parameters in urban area of Beijing City, China, including displacement length (d), roughness length ($z_0$) and friction velocity (u*) and drag coefficient. The surface drag coefficient defined as the ratio between friction velocity and mean wind speed is 0.125 in our research, which is close to typical urban area value. The averaged d and $z_0$ are 1.2 m and 7.6 m. d and $z_0$ change with direction because of the surface heterogeneity over urban surface and reach their maximum values at S-SW sector, this tendency agrees with the surface rough element distribution around the observation tower.

Keywords

References

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