Title: Simulation of the second ETEX release in the proximity of the source

Authors: R. Bellasio, R. Bianconi, S. Mosca, F. Girardi, G. Graziani, W. Klug

Addresses: ENVIROWARE srl, Palazzo Andromeda 1, 20041 Italy. ENVIROWARE srl, Palazzo Andromeda 1, 20041 Italy. ENVIROWARE srl, Palazzo Andromeda 1, 20041 Italy. Joint Research Centre, Agrate Brianza Environment Institute, Ispra (VA), Italy. Joint Research Centre, Agrate Brianza Environment Institute, Ispra (VA), Italy. Mittermayerweg 21, 64289 Darmstadt, Germany

Abstract: The complexity of the weather situation during the second release of ETEX (European Tracer EXperiment) resulted in generally poor performances of the long-range dispersion models employed in the real time simulation of the release. On the other hand, much more detailed meteorological information than those available to the real time modellers were assembled in the course of the experiment and stored in a data bank. This has allowed the possibility of investigating with a much finer mesh interval the mesoscale flow over a few hundreds kilometres range from the source, using a model that could take into account the terrain topography. The resulting flow was used as input to a Lagrangian particle and a Lagrangian puff model that simulated the cloud development for the first hours after the release start. The comparison between calculated and measured tracer concentrations was carried on for a number of sites close to the release site. The result indicated that some of the peculiarities in the dispersion found by the experiment were reproduced, thereby enhancing the importance of this type of approach.

Keywords: atmospheric dispersion; model evaluation.

DOI: 10.1504/IJEP.2000.000551

International Journal of Environment and Pollution, 2000 Vol.14 No.1/2/3/4/5/6, pp.296-306

Published online: 18 Jul 2003 *

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