Boundary-Layer Meteorology

, Volume 30, Issue 1–4, pp 351–373 | Cite as

The wind regime in coastal areas with special reference to results obtained from the Swedish wind energy program

  • Ulf Högström
  • Ann-Sofi Smedman-Högström
Part III/Wind Distribution In Complex Terrain

Abstract

The paper describes various aspects of the wind regime in coastal areas as obtained from several experimental programs along the Baltic coast of Sweden. The studies include the change with distance inland of mean wind structure as well as the turbulence structure in various conditions. It is found that wind spectra are usually well described by local similarity in its high frequency part, even in complex terrain. The low frequency parts of the spectra show clear ‘spectral lag effects’. The effects of a small slope, ca 5 m height change over 300 m travel distance, is clearly seen in some spectra, and it is shown that current ‘flow over a hill theory’ can be used to account for it. The change of mean wind speed throughout the entire boundary layer as the wind passes a low but wooded island (Gotland), ca 30 km wide, has been studied in a series of relatively strong wind, near neutral cases. Some unexpected features are found; in particular the wind speed decreases more rapidly with distance inland than predicted by current numerical models. Two cases with a low level jet are discussed in some detail. Arguments are presented for the phenomenon to be caused by frictional decoupling at the Latvian coast, about 200 km upwind — the jet being thus an analogy in space to the classical Blackadar nocturnal jet frequently observed in continental areas.

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References

  1. Alexandersson, Hans and Bergström, Hans.: 1979, ‘Evaluation of Double Theodolite PIBAL Tracking Data’. Reports No 56, Dept. of Meteor., Uppsala. 72 pp.Google Scholar
  2. Atkinson, B.W.: 1981, ‘Meso-Scale Atmospheric Circulations’. Academic Press, London. 495 pp.Google Scholar
  3. Blackadar, A.: 1957, ‘Boundary Layer Wind Maxima and their Significance for the Growth of Nocturnal Inversions’. Bull. Amer. Meteor. Soc., 38, 283–290.Google Scholar
  4. Bradley, E.F.: 1968, ‘A Micrometeorological Study of Velocity Profiles and Surface Drag in the Region Modified by a Change in Roughness’. Quart. J. Roy. Meteor. Soc., 94, 361–379.Google Scholar
  5. Bradley, E.F.: 1980, ‘An Experimental Study of the Profiles of Wind Speed, Shearing Stress and Turbulence at a Crest of a Large Hill’. Quart. J. Roy. Meteor. Soc., 106, p. 101–123.Google Scholar
  6. Britter, R.E., Hunt, J.C.R. and Richards, K.J.: 1981, ‘Air Flow Over a Two-dimensional Hill: Studies of Velocity Speed-up, Roughness Effects and Turbulence’. Quart. J. Roy. Meteor. Soc., 107, p. 91–110.Google Scholar
  7. Dutton, J.A., Panofsky, H.A., Larko, D., Hampton, N.S., Stone, G. and Vilardo, M.: 1979, ‘Statistics of Wind Fluctuations Over Complex Terrain’. Final report. Dept. of Meteorology, Penn. State Univ. University Park, PA 16802.Google Scholar
  8. Elliott, W.O.: 1958, ‘The Growth of the Atmospheric Internal Boundary Layer’. Trans. Amer. Geophys. Union. 39, p. 1048–1054.Google Scholar
  9. Enger, Leif.: 1983, ‘Numerical Boundary Layer Modelling with Application to Diffusion’. Part I. Report No 70, Dept. of Meteor., Uppsala. 54 pp.Google Scholar
  10. Faxén, Torgny.: 1980, ‘The Gotland-Skåne PIBAL Project for WECS Siting’. Part A. Report No 62, Dept. of Meteor., Uppsala. 192 pp.Google Scholar
  11. Garratt, J.R.: 1980, ‘Surface Influence Upon Vertical Profiles in the Atmospheric Near-Surface Layer’. Quart. J. Roy. Meteor. Soc., 106, 803–819.Google Scholar
  12. Högström, Ulf.: 1982, ‘A Critical Evaluation of the Aerodynamical Error of a Turbulence Instrument’. J. Appl. Meteor., 21, 1838–1844.Google Scholar
  13. Högström, U., Enger, L. and Knudsen, E.: 1980, ‘A Complete System for Probing the Detailed Structure of Atmospheric Boundary Layer Flow’. Meteor. Inst. Uppsala. Report No 60, Uppsala. 41 pp.Google Scholar
  14. Högström, U., Bergström, H. and Alexandersson, H.: 1982, ‘Turbulence Characteristics in a Near Neutrally Stratified Urban Atmosphere’. Boundary Layer Meteor., 23, 449–472.Google Scholar
  15. Höjstrup, Jörgen.: 1981, ‘A Simple Model for the Adjustment of Velocity Spectra in Unstable Conditions Downstream of an Abrupt Change in Roughness and Heat Flux’. Boundary-Layer Meteor., 21, 341–356.Google Scholar
  16. Jackson, P.S. and Hunt, J.C.R.: 1975, ‘Turbulent Wind Flow Over a Low Hill’. Quart. J. Roy. Meteor. Soc., 101, 929–955.Google Scholar
  17. Jensen, N.O. and Peterson, E.W.: 1978, ‘On the Escarpment Wind Profile’. Quart. J. Roy. Meteor. Soc., 104, 719–728.Google Scholar
  18. Kaimal, J.C., Wyngaard, J.C., Izumi, Y. and Coté, O.R.: 1972, ‘Spectral Characteristics of Surface Layer Turbulence’. Quart. J. Roy. Meteor. Soc., 98, 563–589.Google Scholar
  19. Panofsky, H.A., Larko, R., Lipschulz, R., Stone, G.: 1982, ‘Spectra of Velocity Components Over Complex Terrain’. Quart. J. Roy. Meteor. Soc., 108, p. 215–230.Google Scholar
  20. Peterson, E.W., Kristensen, L. and Su, C.C.: 1976, ‘Some observations and Analysis of Wind Over Non-Uniform Terrain’. Quart. J. Roy. Meteor. Soc., 102, p. 857–869.Google Scholar
  21. Peterson, E.W., Jensen, N.O. and Höjstrup, J.: 1979, ‘Observations of Downwind Development of Wind Speed and Variance Profiles at Bognaes and Comparison with Theory’. Quart. J. Roy. Meteor. Soc., 105 p. 521–529.Google Scholar
  22. Peterson, E.W., Taylor, P.A., Höjstrup, J., Jensen, N.O., Kristensen, L. and Petersen, E.L.: 1980, ‘Risö 1978: Further Investigations into the Effects of Local Terrain Irregularities on Tower-Measured Wind Profiles’. Boundary-Layer Meteor., 19, 303–313.Google Scholar
  23. Pennell, W.T.: 1983, ‘An Evaluation of the Role of Numerical Wind Field Models in Wind Turbine Siting: Appendices’. Pacific North West Laboratory PNL-SA-11129 Appendices.Google Scholar
  24. SethuRaman, S.: 1982, ‘Observations of the Boundary Layer Wind Structure Near Land-Sea Interface’. In: Proceedings from First International Conference on Meteorology and Air/Sea Interaction of the Coastal Zone. American Meteorological Society, Boston, USA. p. 4–7.Google Scholar
  25. Smedman, A-S.: 1980, ‘‘The Gotland-Sk»ne PIBAL Project for WECS Siting’. Part B: Evaluation’. Report No 63, Dept. of Meteor., Uppsala. 24 pp.Google Scholar
  26. Smedman-Högström, A-S. and Högström, U.: 1978, ‘A Practical Method for Determining Wind Frequency Distributions for the Lowest 200 Meters from Routine Meteorological Data’. J. Appl. Meteor., 7, 942–954.Google Scholar
  27. Smedman, A-S. and Högström, U.: 1983, ‘Turbulent Characteristics of a Shallow Convective Internal Boundary Layer’. Boundary Layer Meteor., 25, 271–287.Google Scholar
  28. Thom, A.S., Stewart, J.B., Oliver, H.R. and Gash, J.H.C.: 1975, ‘Comparison of Aerodynamic and Energy Budget Estimates of Flux Over a Pine Forest’. Quart. J. Roy. Meteor. Soc., 101, 93–105.Google Scholar

Copyright information

© D. Reidel Publishing Company 1984

Authors and Affiliations

  • Ulf Högström
    • 1
  • Ann-Sofi Smedman-Högström
    • 1
  1. 1.Department of MeteorologyUppsalaSweden

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