Extreme winds in Denmark

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

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch


    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-year wind speed (ten minute averages) under standard conditions, i.e. 10 meter over a homogeneous terrain with the roughness length 0.05 m. The sites are Skjern (15 years),. Kegnaes (7 years), Sprogo (20 years), and Tystofte (16 years). The measured data are wind speed, wind direction, temperature and pressure. The wind records are cleaned for terrain effects by means of WASP (Mortensen et al. 1993): 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 1/2 rho u(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 & Franck (1970) and Abild (1994). It is demonstrated how the data can be applied to non-standard situations where the roughness length depends on the direction. The entire analysis is part of the larger project WA(S)P-Engineering.
    Original languageEnglish
    Title of host publicationWind engineering into the 21st century
    EditorsA. Larsen, G.L. Larose, F.M. Livesey
    Place of PublicationRotterdam
    PublisherCRC Press/Balkema
    Publication date1999
    ISBN (Print)90-5809-060-4, 90-5809-059-0
    Publication statusPublished - 1999
    Event10th International Conference on Wind Engineering - Copenhagen, Denmark
    Duration: 21 Jun 199924 Jun 1999
    Conference number: 10


    Conference10th International Conference on Wind Engineering


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