Dispersion of traffic exhausts emitted from a stationary line source versus individual moving cars

a numerical comparison

verfasst von

Günter Gross

Abstract

A three-dimensional microscale model was used to study the effects of moving vehicles on air pollution in the close vicinity of a road. The numerical results are compared to general findings from wind tunnel experiments and field observations. It was found that the model is suitable to capture the main flow characteristics within an urban street canyon, in particular the modifications relating to running traffic. A comparison of the results for a stationary line source approach and for multiple single moving sources demonstrates significant differences. For a street in a flat terrain, the near-road concentrations are underestimated by up to a factor of two if the emissions are approximated by a stationary line source. This underestimation decreases with increasing distance, and becomes negligible 30-50m away from the road. For an urban canyon situation, the line source assumption is a conservative approximation for the concentrations at the leeside of the street, while on the opposite pavement and wall, a systematic underestimation was found. Also, the effects of different traffic situations have been studied and discussed.

Organisationseinheit(en)

Institut für Meteorologie und Klimatologie

Typ

Artikel

Journal

Meteorologische Zeitschrift

Band

25

Seiten

479-487

Anzahl der Seiten

9

ISSN

0941-2948

Publikationsdatum

06.09.2016

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Atmosphärenwissenschaften

Ziele für nachhaltige Entwicklung

SDG 11 – Nachhaltige Städte und Gemeinschaften

Elektronische Version(en)

https://doi.org/10.1127/metz/2016/0797 (Zugang: Offen)
https://doi.org/10.15488/523 (Zugang: Offen)