Vertical distribution of mean wind speed

\bar{u} (z) = {\bar{u}}_{ref} \cdot {(\frac{z - d_{0}}{z_{ref} - d_{0}})}^{α}

ū(z)	mean wind speed at height z
ū_ref	mean wind speed at reference height z_ref
z	height above ground
Z_ref	reference height
d₀	displacement height
α	profile exponent

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