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Intercomparison of Atmospheric Dispersion Models Applied to an Urban Street Canyon of Irregular Geometry

Category: Technical Note

Volume: 18 | Issue: 3 | Pages: 820-828
DOI: 10.4209/aaqr.2017.11.0489
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Mariana Dezzutti 1, Guillermo Berri1, Laura Venegas2

  • 1 Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA La Plata, Argentina
  • 2 Universidad Tecnológica Nacional - Facultad Regional Avellaneda, B1870AAU Avellaneda, Buenos Aires, Argentina

Highlights

Intercomparison of air pollution dispersion models for urban canyons.
Urban street canyon of irregular geometry.
Model calculations validated with NOx concentration measurements.
Simple parametric dispersion model SEUS provides the best results.


Abstract

The NOx concentrations measured at the sampling site of Cordoba Avenue, Buenos Aires City, characterised by an irregular geometry on both sides of the street, are used to intercompare results of five urban street canyon dispersion models, STREET, OSPM, AEOLIUSF, STREET-BOX and SEUS. Three different wind directions with respect to the street axis are considered, i.e., leeward, windward and parallel. Additionally, two wind speed classes are considered, above and below 2 m s–1. In order to evaluate the models performance, observed and calculated concentrations are compared using different statistical measures, i.e., mean values, bias, mean square error and fractional error. In general, all models estimate better leeward conditions and wind speeds above 2 m s–1, with SEUS providing the overall best result.

Keywords

Atmospheric dispersion models Intercomparison of results Urban street canyon with irregular geometry


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