Graduate Thesis Or Dissertation
 

An examination of the spectrum for coastal winds on the mesoscale

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  • Wind speed data were taken at a weather station on the coast and horizontal wind speed energy spectra were computed. The shape of an average spectrum obtained in marine environment is compared with an average land spectrum and the presence of a spectral gap is observed in the shoreline spectrum. Wave number domain spectra are compared with frequency domain spectra. Strong similarity between the spectra is found for short periods, but at longer periods the f-space spectrum localizes most of the energy at specific frequencies, while the k-space spectrum spreads the energy over many wave numbers. When the wind speed is fairly constant, Taylor's hypothesis is found to be a reasonable approximation up to periods of tens of minutes. A preliminary investigation of the dependence of the value of the drag coefficient on the period over which the average wind is measured was made. A line of the form C[subscript Dx]/C[subscript D₁₀]= .89 + .1 log X fits the graphed points quite well with a correlation of .98, where X is the averaging distance in miles. Differences of 20% in the value of the drag coefficient over averaging distances between 10 and 1600 miles are observed. From this preliminary study, it appears that a more detailed study of this effect would be worthwhile.
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