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IRSN, Institut de radioprotection et de sûreté nucléaire

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A mechanical study of the dry deposition of aerosols on the vegetation cover.

Alexandre PETROFF. Doctorate of the University of Aix-Marseille II speciality: mechanics, option: fluid mechanics, 235p. Defended on the 15th April 2005

Document type > *Mémoire/HDR/Thesis

Keywords > aerosol, deposition, modelling, particles, radiological protection

Research Unit > IRSN/DEI/SECRE/LME

Authors >

Publication Date > 15/04/2005

Summary

The dry deposition of aerosols onto vegetated canopies is modelled through a mechanistic approach. The interaction between aerosols and vegetation is firts formulated by using a set of parameters, which are defined at the local scale of one surface. The overall deposition is then deduced at the canopy scale through an up-scaling procedure based on the statistic distribution parameters. This model takes into account the canopy structural and morphological properties, and the main characteristics of the turbulent flow. Deposition mechanisms considered are Brownian diffusion, interception, initial and turbulent impaction, initially with coniferous branches and then with entire canopies of different roughness, such as grass, crop field and forest.


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