Empirical Formula for the Mean Wind Speed

The mean wind speed is frequently represented empirically as a power law function of height, 

The exponent p is then to be determined on the basis of atmospheric conditions. By differentiating (16.78) with respect to. v, p is found from 

FIGURE 16.7 Exponent in the power-law expression for wind speed == x fx y as 

Surface Wind Speed at 10 m (m s ) Solar Radiation Nighttime Cloud Cover Fraction  

FIGURE 16.8 A relationship between Monin-Obukhov length L and roughness height for various Pasquill stability classes (Myrup and Ranzieri, 1976). 

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