Summary
A numerical model of the dispersion of gaseous atmospheric pollutants based on the K-theory has been proposed, and the numerical procedure has been validated by confronation with analytical solution.
The physical parametrization of the model in the surface layer is based on the similarity theory and requires a set of micrometeorological tower data, and an estimation of surface roughness length.
The extrapolation to the planetary boundary layer of wind velocity is carried out by a power law profile which fits the log-linear profile in the surface layer, while that of vertical eddy diffusivity is carried out in several different ways proposed in literature. Also the crosswind eddy diffusivity is parametrized in several different ways. The ground level concentration results to be strongly depending on the vertical and horizontal eddy diffusivity parametrization.
Then the usefulness of analytical models as to ground level concentration, if an opportune atmospheric parametrization is adopted, has been considered.
Zusammenfassung
Es wird ein auf die K-Theorie begründetes numerisches Modell für die Verbreitung von gasförmigen Luftverunreinigungen vorgeschlagen und das numerische Verfahren durch eine Gegenüberstellung zur analytischen Lösung bestätigt. Die physikalische Parametrisierung des Modells wird in der oberflächennahen Schicht auf die Ähnlichkeitstheorie begründet und erfordert eine Reihe von mikrometeorologischen Beobachtungsdaten und eine Schätzung der Oberflächenrauhigkeitslänge.
Die Extrapolation der Windgeschwindigkeit auf die planatare Grenzschicht wird mit einem Profil nach dem Potenzgesetz ausgeführt, das dem linearen logarithmischen Profil in der Oberflächenschicht angepaßt ist, während sie für die vertikale turbulente Diffusion nach verschiedenen in der Literatur angegebenen Arten durchgeführt wird. Auch die turbulente Diffusion quer zum Wind wird auf verschiedene Arten parametrisiert. Die Konzentration in der Grundschicht ist stark von der Parametrisierung der vertikalen und horizontalen turbulenten Diffusion abhängig.
Die Brauchbarkeit analytischer Modelle für die Konzentration in der Grundschicht wird bei angenommener passender atmosphärischer Parametrisierung einer Betrachtung unterzogen.
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Nanni, T., Tagliazucca, M. Turbulent dispersion of gaseous pollutants: Numerical study of ground level concentration as a function of Eddy diffusivity parametrization on the atmospheric boundary layer. Arch. Met. Geoph. Biocl., Ser. B 31, 159–190 (1982). https://doi.org/10.1007/BF02278292
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DOI: https://doi.org/10.1007/BF02278292