Simulação numérica do transporte de um poluente inerte e passivo na CLP convectiva através de um modelo LES

Authors

  • Edson P. Marques Filho Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, SP
  • Amauri P. de Oliveira Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, SP
  • Hugo A. Karam Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, SP
  • Umberto Rizza Istittuto per lo Studio dell”Inquinamento Atmosferico e I”Agrometeorologia, Lecce

DOI:

https://doi.org/10.5902/2179460X63623

Keywords:

LES, Convective PBL, dispersion of inert pollutants. PBL numerical models

Abstract

This work describes the time evolution of three dimensional structure of an inert and passive atmospheric pollutant, continuously emitted by an area source located at surface. These and other dynamic and thermodynamic properties of PBL are simulated numerically by the large eddy simulation model (LES) proposed by Moeng. The vertical structure of mean pollutant concentration and the associated vertical turbulent fluxes are consistent with a Mixed Layer, with approximately zero vertical gradients and vertical fluxes varying linearly with height. The vertical distribution of pollutant concentration variance does not follow the Mixed Layer Similarity Theory. The instantaneous vertical wind field shows an asymmetric spatial distribution, with skewness varying from 0.4, near the surface, to 1.62 at the PBL top. This result indicates that the updrafts are more intense and localized than the downdrafts. The spatial distribution of pollutant is consistent with the wind field pattern associated with the large eddies, mainly near to the top.

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References

Cai, X.-M. 2000. Dispersion of a passive plume in an idealized urban convective boundary layer: A large-eddy simulation. Atmospheric Environment, 34: 61-72.

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Marques Filho, E. P., Oliveira, A P., Karam, H. A and Rizza, U, 2002. An investigation of pollutant dispersion in a highly convective boundary layer using large eddy simulation. Submited the Meteorology and Atmospheric Physics.

Moeng, C.-H. 1984. A large-eddy simulation model for the study of planetary boundary-layer turbulence. Journal of the Atmospheric Sciences, 41: 2052-2062.

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Willis, G. E. and Deardorff, J. W. 1978. A laboratory study of dispersion from an elevated source in a convective mixed layer. Atmospheric Environment, 12: 1305-1313.

Wyngaard, J. C. and Brost, R. A. 1984. Top-down and bottom-up diffusion of a scalar in the convective boundary layer. Journal of the Atmospheric Sciences, 41: 102-112.

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Published

2002-01-18

How to Cite

Marques Filho, E. P., Oliveira, A. P. de, Karam, H. A., & Rizza, U. (2002). Simulação numérica do transporte de um poluente inerte e passivo na CLP convectiva através de um modelo LES. Ciência E Natura, 83–96. https://doi.org/10.5902/2179460X63623

Issue

CIÊNCIA E NATURA, SPECIAL VOLUME, 2002: II WORKSHOP ON PHYSICS OF THE PLANETARY BOUNDARY LAYER AND DISPERSION PROCESS MODELING

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