The Urban Dispersion Model (UDM) is a Gaussian puff model designed to handle dispersion within urban environments. It is a semi-empirical model based on a large number of urban experiments conducted in a boundary layer wind tunnel. The model is computationally very fast, capable of providing dispersion estimates of multiple releases in urban areas consisting of tens of thousands of buildings significantly faster than real time. It provides estimates of the 3D concentration and dosage fields over time. Further details can be found in Hall et al (1997). This paper provides the results of a comparison study between measured and modelled results for three releases made over one night during the Urban 2000 field campaign.
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