Turbulent fluctuations and their use in estimating compliance with standards and in model evaluation Online publication date: Mon, 07-Jul-2003
by S.J. Dyster, D.J. Thomson, C.A. McHugh, D.J. Carruthers
International Journal of Environment and Pollution (IJEP), Vol. 16, No. 1/2/3/4/5/6, 2001
Abstract: Turbulent fluctuations are important in dispersion problems where short timescale peak values can be critical. These situations include: a) releases of toxic, flammable or odourous substances where high short time scale impacts may be dangerous or cause a nuisance; b) estimating concentrations for regulatory purposes for comparison with limits based on a short timescale, such as the UK 15-minute or WHO 10-minute levels for SO2; c) assessing the uncertainties in dispersion model predictions and aiding model comparison with measured data. The ADMS 3 dispersion model includes a module to calculate turbulent fluctuations which is based on a ''two particle dispersion'' concept but has much in common with Gifford's meandering plume model. It has been used in critical applications where odour and exceedences of a regulatory value were the issues. In this paper, the fluctuations model is described and each of the three applications is illustrated.
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