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Title : Statistics of Off Shore Wind Speed Gusts
Authors : Gunner Chr. Larsen and Kurt S. Hansen

Summary :
The present paper deals with a statistical method that, based on experimental observations, can be applied to estimate the probability density function for extreme events corresponding to an arbitrary recurrence period. The statistical approach is described and subsequently applied on data sets representing wind speed gusts originating from two off shore locations with different characteristics. Upstream fetch and water depth are known to be leading parameters in relation to off shore wind climate characteristics, and the off shore sites selected for the present investigation represent coastal ocean waters as well as more constrained inner Danish waters. The analysis are based on measurements extracted from “Database on Wind Characteristics” (http://www.winddata.com/), where more than 72000 hours of high quality wind field data, representing a wide variety of wind climates and terrain types, are available. The estimated extreme distributions associated with the investigated off shore sites are mutually compared, and finally the most likely extremes, derived from the estimated distributions, are compared to the IEC 61400-1 specifications associated with turbulence class B.

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