Extreme winds in Denmark

L. Kristensen, O. Rathmann, S.O. Hansen

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    Wind-speed data from four sites in Denmark have been analyzed in order to obtain estimates of the basic wind velocity, defined as the 50 yr wind speed (10 min averages) under standard conditions, i.e., 10 m over a homogeneous terrain with the roughness length 0.05 m, The sites are Skjern (15 yr), Kegnaes (7 yr), Sprogo (20 yr), and Tystofte (16 yr). The measured data are wind speed, wind direction, temperature and pressure. The wind records are cleaned for terrain effects by means of WASP (Mortensew ct al., Technical Report I-666 (EN), Riso National Laboratory, 1993. Vol. 2. User's Guide): assuming geostrophic balance, all the wind-velocity data are transformed to friction velocity u(*) and direction at standard conditions by means of the geostrophic drag law for neutral stratification. The basic wind velocity in 30 degrees sectors are obtained through ranking of the largest values of the friction velocity pressure pu(*)(2)/2 taken once every two months. The main conclusion is that the basic wind velocity is significantly larger at the west coast of Jutland (25 +/- 1 m/s) than at any of the other sites (22 +/- 1 m/s). These results are in agreement with those obtained by Jensen and Franck (Technical Report, Danish Technical press, 1970) and by Abild (Technical Report R-522 (EN), Riso National Laboratory, 1994). A short discussion of the wind storm on the 3rd of December 1999 is included. It is demonstrated how the data can be applied to non-standard situations where the roughness length depends on the direction. (C) 2000 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    JournalJournal of Wind Engineering & Industrial Aerodynamics
    Volume87
    Issue number2-3
    Pages (from-to)147-166
    ISSN0167-6105
    DOIs
    Publication statusPublished - 2000
    Event10th International Conference on Wind Engineering - Copenhagen, Denmark
    Duration: 21 Jun 199924 Jun 1999
    Conference number: 10

    Conference

    Conference10th International Conference on Wind Engineering
    Number10
    Country/TerritoryDenmark
    CityCopenhagen
    Period21/06/199924/06/1999

    Keywords

    • basic wind velocity
    • drag law
    • 50 yr wind speed
    • geostrophic wind
    • wind code
    • wind storm

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