کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10643217 | 998207 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Analysis and parameterisation of wind profiles in the low atmosphere
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Analysis and parameterisation of wind profiles in the low atmosphere Analysis and parameterisation of wind profiles in the low atmosphere](/preview/png/10643217.png)
چکیده انگلیسی
Knowledge of temporal and spatial variation of the wind is important to obtain accurate calculations of wind power potential. The best estimation method involves direct measurement of wind speed which, however, is not always possible. In such cases, a good parameterisation of wind profile is necessary. A RASS sodar located in Northern Spain has been used in this paper. This device provided a broad database of 10-min averages from August 2002 to January 2004. The vertical range extended from 40 to 500Â m in 20Â m levels, although the 220Â m level was selected as the upper boundary by analysis of wind speed and temperature vertical profiles. Hourly medians were calculated each month in the 10 lower levels, yielding a sharp contrast between day and night. Flat wind speed profiles were clear during day, mainly in summer, due to convection produced by surface heating. However, stable stratification favoured horizontal movement and wind speed values increasing with height were observed during the night. Power and logarithmic laws have been fitted from vertical profiles of hourly wind speed medians. The exponent of the power law showed hourly medians greater than 0.5 during the night and lower than 0.2 during the day. A simple model has been proposed for the parameters of both expressions, consisting of an addition of three harmonic functions with periods of 1Â year, 1Â day and half a day. Hourly wind speed medians were successfully fitted at the heights of interest, although the fit proved better for the power law. Finally, a slight decrease in fitting at increasing heights was also observed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy - Volume 78, Issue 6, June 2005, Pages 809-821
Journal: Solar Energy - Volume 78, Issue 6, June 2005, Pages 809-821
نویسندگان
I.A. Pérez, M.A. GarcÃa, M.L. Sánchez, B. de Torre,