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.
To test the model, two sets of dispersion experiments were carried out; SF6 measurements near two non-buoyant sources and lidar observations of a smoke plume. From these experiments values of the hourly-mean concentration and of σy and σz were derived, which are compared with values calculated by applying the wind fluctuation model and three other dispersion models. It is concluded that σv and Te can easily be obtained by measuring wind direction and wind speed, and that dispersion may well be modelled through direct conversion of these parameters into σy and σz without the use of a stability parameter.
Joint Laboratories and Other Services of the Dutch Electricity Supply Undertakings
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© 1988 Kluwer Academic Publishers
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van Duuren, H., Erbrink, J.J., Kema, N.V. (1988). Modelling Dispersion of Air Pollutants Emitted by Power Stations Using Fluctuations of Wind Direction. In: Grefen, K., Löbel, J. (eds) Environmental Meteorology. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2939-5_36
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DOI: https://doi.org/10.1007/978-94-009-2939-5_36
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