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Businger–Dyer relationship

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A similarity relationship between surface flux of a variable and the mean vertical profile of that variable.

These are generically of the form

where M is mean wind speed, u_* is the friction velocity (a term representing the momentum flux), k is von Kármán's constant, z is height above ground, d is displacement distance, z₀ is roughness length, ψ is an empirical stability correction term, and L is the Obukhov length.
Stull, R. B. 1988. An Introduction to Boundary Layer Meteorology. 666 pp.

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