INFLUENCE OF WIND SHEAR ON TRANSVERSE DISPERSION OF A POLLUTANT CLOUD OVER GREAT DISTANCES FROM A SOURCE

S. P. Beschastnov and A. V. Naidenov

Empirical relationships are derived for relative transverse dispersion of the pollutant cloud concentration field, which generally include initial, turbulent, and shear components. It is shown that in most existing relationships the contribution of lateral wind shear is much overestimated and the proportionality factor in the shear term is 0.036, not 1/6 as in earlier studies. This conclusion is supported by experimental data of other researchers and by numerical dispersion calculations with a model based on the method of moments of the pollutant cloud concentration field. This model is also used to obtain an estimate of the proportionality factor for longitudinal relative dispersion.

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