Analysis of vertical wind direction and speed gradients for data from the met. mast at Høvsøre

Nicolas Cariou, Rozenn Wagner, Julia Gottschall

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    Abstract

    The task of this project has been to study the vertical gradient of the wind direction from experimental data obtained with different measurement instruments at the Høvsøre test site, located at the west coast of Denmark. The major part of the study was based on data measured by wind vanes mounted at a meteorological (met.) mast. These measurements enabled us to make an analysis of the variation of the direction with altitude, i.e. the wind direction shear. For this purpose, four years of wind direction measurements at two heights (60 m and 100 m) were analysed with special respect to the diurnal and seasonal variations of the direction gradient. The location of the test site close to the sea allowed for an investigation of specific trends for offshore and onshore winds, dependent on the considered wind direction sector. Furthermore, a comparison to lidar measurements showed the existence of an offset between the two vanes used for the analysis, which has to be considered for evaluating the significance and uncertainty of the results. Finally, the direction shear was analysed as function of wind speed and compared to the corresponding relation for the wind speed shear. Our observation from this is that the direction shear does not necessarily increase with the speed shear.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages34
    ISBN (Print)978-87-550-3821-9
    Publication statusPublished - 2010
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number1733(EN)
    ISSN0106-2840

    Keywords

    • Remote measurements and measurement technique
    • Wind energy
    • Risø-R-1733
    • Risø-R-1733(EN)

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