Inderscience Publishers

Turbulent fluctuations and their use in estimating compliance with standards and in model evaluation

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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.

Keywords: ADMS, clipped-normal distribution, correlations, exceedences, fluctuations, turbulence

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