Abstract
To calculate the effects at ground level of emissions of air pollutants from large power stations, a dispersion model has been developed by which hourly concentrations can be calculated. The model is based on the Gaussian dispersion model of which the parameters σy and σz are calculated from the fluctuations of the horizontal wind direction. To do so, the fast stability-dependent fluctuations are separated from the slower stability-independent ones. The fast fluctuations are characterized by the standard deviation σv of the lateral wind velocity and by the Eulerian time-scale Te. The values of σv and Te are used to calculate σz. Parameter σy is also calculated from σv and Te, by which a contribution of the stability-independent fluctuations is taken into account.
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