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Phys. Fluids 12, 1529 (2000); http://dx.doi.org/10.1063/1.870401 (6 pages)
Statistics of wind direction and its increments
(Received 26 March 1999; accepted 6 March 2000)
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Add to FacebookWe study some elementary statistics of wind direction fluctuations in the atmosphere for a wide range of time scales (10−4 sec to 1 h), and in both vertical and horizontal planes. In the plane parallel to the ground surface, the direction time series consists of two parts: a constant drift due to large weather systems moving with the mean wind speed, and fluctuations about this drift. The statistics of the direction fluctuations show a rough similarity to Brownian motion but depend, in detail, on the wind speed. This dependence manifests itself quite clearly in the statistics of wind-direction increments over various intervals of time. These increments are intermittent during periods of low wind speeds but Gaussian-like during periods of high wind speeds. © 2000 American Institute of Physics.
© 2000 American Institute of Physics
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B. Dhruva, Y. Tsuji, and K. R. Sreenivasan, "Transverse structure functions in high-Reynolds-number turbulence," Phys. Rev. E 56, R4928 (1997).
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