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Boundary-Layer Meteorology

, Volume 3, Issue 4, pp 424–441 | Cite as

Gust factors over open water and built-up country

  • J. Wieringa
Article

Abstract

Data are presented of the gust factorG =umax/ū, both at 8-m height over a lake and up to 80-m height at the edge of a town. It is argued that, due to the presence of trends in long-period averages, the use of arithmetic or least-squareG-averages leads to overestimation of the dependence ofG on wind speedu, and medianG-values are preferable. A simple non-spectral model for gustiness at high wind speeds in the constant-stress layer is proposed and checked. The model relatesG to surface roughness and height above surface for gust wavelengths up to ≈ 200 m. The gust factor concept is shown to be inadequate for characterizing thunderstorm gustiness.

Keywords

Surface Roughness Wind Speed Open Water High Wind High Wind Speed 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1973

Authors and Affiliations

  • J. Wieringa
    • 1
  1. 1.Royal Netherlands Meteorological InstituteDe BiltThe Netherlands

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