A Study Of The Atmospheric Dispersion Of An
Elevated Release With Plume Rise In A Rural
Environment: Comparison Between Field SF6
Measurements And Computations Of Gaussian
Models (Briggs, Doury And ADMS 4.1)
Author(s)
C. Leroy, F. Derkx, O. Connan, P. Roupsard, D. Maro,
D. Hébert & M. Rozet
Abstract
In order to reduce uncertainties and enhance the knowledge of elevated releases
atmospheric dispersion in a rural plain, the French Institute for Radioprotection
and Nuclear Safety (IRSN), in collaboration with VEOLIA, carried out six
weeks of experimental campaigns between November 2008 and July 2009 in the
vicinity of an energy recycling unit. The atmospheric dispersion of the plume
was studied by SF6 tracer injection in the 40 m high stack. Maximal values of
experimental Atmospheric Transfer Coefficient (ATCmax) and horizontal
dispersion standard deviations (σh) were compared to the results of the first
generation Gaussian models, Doury and Briggs, and to the results of the last
generation Gaussian models, ADMS 4.1 (Atmospheric Dispersion Modelling
System). Several modelling parameterization for ADMS 4.1 computations were
tested and revealed an overestimation of the σh with the building option or with
the integration of a surface roughness file. Consequently, ADMS 4.1 was used
without model options. The Doury and Briggs models were combined with
Holland formulation for the effective height calculation. In neutral atmospheric
conditions and in summer unstable conditions (class A, B and C according to
Pasquill classification), the ADMS 4.1 model is appropriate to estimate ATCmax
Keywords
atmospheric dispersion, rural environment, SF6 tracer release, Gaussian models
Related Book
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