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ESDU 88037

ESDU 88037 2012-FEB-01 World-wde extreme wnd speeds Part 2 examples usng varous methods of analyss

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ESDU 88037 provides two examples of the use of the methods of ESDU 87034 for the analysis of wind speed maxima: using data for a single dominant storm mechanism and using data where there are two dominant mechanisms. In the first example, the quantity of data to be considered is reduced by taking only those wind speeds above a certain threshold, and the procedure for calculating confidence limits on the variation of estimated extreme wind speed with mean recurrence interval is illustrated. For the other example, a Monte Carlo method is used to determine confidence limits on the estimate of extreme wind speed by generating a sequence of simulated annual extreme storms having the required characteristics. The errors in estimated extreme wind speed if the wind speed maxima from the two mechanisms are not analysed separately are also shown. A third example is included, showing the inverse use of the method of ESDU 88038 by which the parameters of the Fisher-Tippett Type 1 extreme value distribution are deduced from the Weibull parameters of the parent cumulative distribution (in this case a two-year continuous wind speed record). This approach is particularly useful where complex topographic effects on wind speed at a site cannot be determined so that extreme wind speed cannot be predicted using a design wind speed map.

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