Abstract
This paper examines an alternative approach from the traditional Gumbel method to the estimation of extreme mean wind speeds. The method is based on Rice's upcrossing rate expression and only requires a statistical description of the parent population. Initially, the long-term power spectrum of wind speeds is developed in an attempt to evaluate some necessary parameters and the results are found to be similar to those obtained by other researchers. Favourable comparisons are found between Rice's expression and observed crossing rates of low and intermediate mean speeds. Rice's expression is then extended to yield return periods of extreme speeds, enabling a comparison to be made with Gumbel's method applied to eighteen annual maxima. Again, the agreement is satisfactory. Finally, the data requirements for the application of this method are examined and a relationship is derived between the length of data employed and the coefficient of variation of predicted extreme speeds.
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