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Wind shear coefficients, roughness length and energy yield over coastal locations in Southern Italy

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  • Gualtieri, Giovanni
  • Secci, Sauro

Abstract

In the present work a computation of wind shear coefficients (WSCs) based on 1-h measured wind data has been performed by three stations located over coastal sites in Southern Italy, i.e., Brindisi (BR), Portoscuso (PS) and Termini Imerese (TI). Wind observations have been collected through a 6-year period (January 1, 1997 to December 31, 2002) by wind mast recording at the same two sensor heights (i.e., 10 and 50m AGL), thus enabling a proper wind profile analysis. WSC overall mean values were found to be 0.271 at BR, 0.232 at PS, and 0.150 at TI. In addition, a detailed analysis has been carried out to describe the WSC yearly, monthly and diurnal variation, as well as by wind direction. The characteristics of z0 surface roughness length have been also investigated as an estimate for neutral stability conditions only, resulting in overall mean values of 0.526m at BR, 0.287m at PS, and 0.027m at TI. The z0 variation by year, month and hour of the day, as well as by wind direction, has been analysed, too. The European “Corine Land Cover 2000” classification of the study areas has been employed to deeply investigate the land use influence on both WSC and z0 characteristics as a function of wind direction.

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  • Gualtieri, Giovanni & Secci, Sauro, 2011. "Wind shear coefficients, roughness length and energy yield over coastal locations in Southern Italy," Renewable Energy, Elsevier, vol. 36(3), pages 1081-1094.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:3:p:1081-1094
    DOI: 10.1016/j.renene.2010.09.001
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