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Which theory describes the surface layer profiles?

  • A.Kolmogorov theory
  • B.Prandtl boundary layer theory, which describes the laminar layer adjacent to a smooth solid surface below
  • C.Monin-Obukhov similarity theory
  • D.Mixing length theory, which relates the turbulent flux to the mean gradient through an eddy diffusivity

Answer: C

Monin and Obukhov showed that the dimensionless wind and temperature gradients in the surface layer are universal functions of height divided by the Obukhov length. The theory reduces the whole surface layer problem to a pair of empirically determined functions. Mixing length ideas are one ingredient and Kolmogorov theory concerns the inertial subrange of the turbulence spectrum. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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