Wind profile modelling using WAsP and "tall" wind measurements

Rogier Ralph Floors, Mark C. Kelly, Ib Troen, Alfredo Pena Diaz, Sven-Erik Gryning

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsResearchpeer-review


    Horizontal and vertical extrapolations of wind speed and power density are needed in the wind energy industry to perform wind resource assessments. The Wind Atlas Analysis and Application Program (WAsP) is a tool that combines several physical models to perform such extrapolations. For vertical extrapolations (the wind profile) this is done using the Weibull distribution and the geostrophic drag law. Wind lidar measurements obtained during the ’Tall wind’ campaign at three different sites are used to evaluate the assumptions and equations that are used in the WAsP vertical extrapolation strategy. The surface fluxes were estimated from the wind, temperature and humidity profiles using an iterative method for consistency withWAsP, while the geostrophic wind and boundary-layer wind veering angle were estimated using the combined mast and lidar measurements. The effect of baroclinicity on the constants A and B in the geostrophic drag law was taken into account by specifying a mean offset between the thermal and surface geostrophic wind vector and a mean magnitude of the thermal wind vector. Wind lidar and mast measurements from 11 different sites (that were not used in determining the empirical constants) in the North Sea area were used to evaluate different versions of the WAsP for vertical extrapolation of wind. The effect of baroclinicity and the implementation of newly chosen constants on the reversal height, the profiles of the Weibull A and k parameters and the overall model performance is discussed.
    Original languageEnglish
    Title of host publicationAbstracts of the 15th EMS Annual Meeting & 12th European Conference on Applications of Meteorology (ECAM) 2015
    Number of pages1
    PublisherEuropean Meteorological Society
    Publication date2015
    Article numberEMS2015-537
    Publication statusPublished - 2015
    Event15th EMS Annual Meeting & 12th European Conference on Applications of Meteorology (ECAM) - Hotel Marinela - Sofia, Sofia, Bulgaria
    Duration: 7 Sept 201511 Sept 2015
    Conference number: 15


    Conference15th EMS Annual Meeting & 12th European Conference on Applications of Meteorology (ECAM)
    LocationHotel Marinela - Sofia
    Internet address
    SeriesEMS Annual Meeting Abstracts


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