Determining Longitudinal Integral Turbulence Scales in the Near-Neutral Atmospheric Surface Layer
2019
Simiu, Emil | Potra, Florian A. | Nandi, Tarak N.
We briefly assess approaches used to date for the estimation of the longitudinal integral turbulence scale [Formula: see text] in the near-neutral atmospheric surface layer, and propose an approach based on recent theory and measurements. A closed-form expression is derived according to which [Formula: see text] is proportional to the height z above the surface. The factor of proportionality depends upon two non-dimensional parameters: the measured lowest Monin frequency [Formula: see text] for which the non-dimensional spectrum conforms to Kolmogorovs two-thirds law, and the ratio [Formula: see text], where [Formula: see text] and [Formula: see text] denote the mean square value of the longitudinal velocity fluctuations and the friction velocity, respectively.
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