A study of the characteristic structures of strong wind

Characteristics of the wind field during a typhoon passage were studied. Both spectral and statistical analyses were carried out. The turbulent fluctuating components of the velocity, as well as that of the temperature, were fitted with two statistical models. Auto- and cross-spectra of the fluctuating components were also calculated. During the passage of the typhoon, the high frequency tails of the spectra for the velocity components were found to have slopes that are flatter than the Kolmogorov −5/3 law prescribes. While the spectra of the temperature fluctuations usually have features that are characteristic for white noise, they become steeper just before the passage of the strongest wind. In general, the Gaussian model can be used to describe the distributions of all the three velocity components, although the Gram–Charlier series expansion would yield better fits.