Wind shear extremes at possible offshore wind turbine locations

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Positive and negative short-term extreme wind shear distributions (conditioned on the mean wind speed) are determined and compared for a number of offshore sites. The analysis is based on rapidly sampled field measurements (1-8 Hz) extracted from the "Database on Wind Characteristics" ( Three different averaging periods (2, 5 and 10 seconds) are considered, and for each averaging period a relation between the resulting extreme shear distributions and the averaging time are presented. The short-term extreme shear analysis is based on different spatial distances, and extrapolation to a spatial distance of 100 m has been investigated. Such distances are appropriate for the next generation of offshore wind turbines. The paper concludes with an estimation of the short-term extreme shear values, w hich are compared to the values specified in the IEC-61400 code. The extreme IEC shear values seems to be rather conservative for an offshore location, compared to the estimated values based on measurements.
Original languageEnglish
JournalWind Engineering
Issue number5
Pages (from-to)339-349
Publication statusPublished - 2003


  • Wind shear
  • Offshore
  • Extreme wind conditions
  • Statistical analysis
  • Turbulence
  • Wind Loading


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