Derivation of eddy diffusivities from an unsteady turbulence spectrum
Goulart, A. G., Moreira, D. M., Carvalho, J. C. and Tirabassi, T.
2004 Atmospheric Environment, 38(36): 6121-6124
Eddy diffusivity; Analytical model; Unsteady turbulence; Inhomogeneous turbulence; Planetary boundary layer
Goulart, A. G., Moreira, D. M., Carvalho, J. C. and Tirabassi, T., (2004), "Derivation of eddy diffusivities from an unsteady turbulence spectrum", Atmospheric Environment, 38(36): 6121-6124.
Abstract:
A general formulation for eddy diffusivities has been derived for use in atmospheric dispersion models. Expressions of eddy diffusivities for inhomogeneous turbulence are proposed, which are calculated directly with the Batchelor theory and can consider nonstationary spectrum important in turbulence decay. A statistical evaluation shows that the results of an air pollution model, with the K-parameterisation included, produces a good fit of the measured ground-level concentration data in the experimental conditions considered.
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