A boundary-layer model for the determination of hourly surface wind characteristics in a representative tropical African region |
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| Authors: | E H Abu Bakr J Wieringa |
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| Institution: | (1) Eindhoven Technical University, Faculty of Physics, Laboratory of Fluid Dynamics and Heat Transfer, Wind Energy Group, 5600 MB Eindhoven, The Netherlands;(2) Royal Netherlands Meteorological Institute, De Bilt, The Netherlands;(3) Department of Applied Physics, Technical University, Delft, The Netherlands |
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| Abstract: | A quantative transposition model is introduced which determines hourly wind speeds in a representative tropical region (Central Sudan). The model consists of two parts. Firstly, a local boundary-layer model, based on the energy balance equation and the Businger-Dyer equations, is used to compute the average diurnal cycle of various characteristic boundary-layer parameters. Secondly, a horizontal transposition method is introduced to calculate wind speed behaviour at an arbitrary station from that at a reference station. This method is based on assumed spatial constancy of the turbulence parameter u
* in the period November–April in a region of about (700 × 800) km2 in Central Sudan. The constancy of u
* is concluded from the very stationary character of the climate. Model-computed hourly wind speeds are consistent with the potential wind speeds (at 10 m over open country) calculated from the measured data, and provide better local wind estimates than the conventional procedure which assumes constant regional hourly wind speeds. |
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