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Abstract

In this paper a comparison is made between measured and calculated air concentration values following tracer gas releases performed both at ground level and from an elevated source. The trials were carried out in Northern Italy which is an area of great topographic complexity, due to the presence of hills and lakes and the proximity of the Alps. Since the meteorological situation analysed was one of the most typical for the locality, this will facilitate the use of the results of the comparison for the assessment of potential environmental and health impacts of accidental releases into the atmosphere of dangerous substances. Micrometeorological parameters determined at different stations were employed in the analysis. The calculations were carried out by means of a computer code, which maintains the fundamentals of the Gaussian formulation of dispersion, allowing at the same time, an accurate numeric simulation of the plume evolution, by taking into account non-stationary and non-homogeneous wind conditions. In general, the comparison between measured and calculated tracer concentration values at the receptor points has shown good agreement, indicating that the most important features of the phenomena have been well understood and modelled, and that the numerical values of the dispersion parameters are correctly quantified.

Additional information

Authors: GRAZIANI G, JRC ISPRA ESTAB. (ITALY);MAINERI M JRC ISPRA ESTAB. (ITALY), JRC ISPRA ESTAB. (ITALY)
Bibliographic Reference: ENVIROSOFT '88, PORTO CARRAS (GREECE), SEPT. 27-29, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, MENTIONING PAPER EN 34206 ORA
Availability: Can be ordered online
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