Details
| Original language | English |
|---|---|
| Pages (from-to) | 479-487 |
| Number of pages | 9 |
| Journal | Meteorologische Zeitschrift |
| Volume | 25 |
| Issue number | 4 |
| Early online date | 6 Jul 2016 |
| Publication status | Published - 6 Sept 2016 |
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.
Keywords
- Micro-scale simulation, Running traffic, Urban canyon concentration, Vehicle dispersion
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Atmospheric Science
Sustainable Development Goals
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In: Meteorologische Zeitschrift, Vol. 25, No. 4, 06.09.2016, p. 479-487.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Dispersion of traffic exhausts emitted from a stationary line source versus individual moving cars
T2 - a numerical comparison
AU - Gross, Günter
N1 - Publisher Copyright: © 2016 The authors.
PY - 2016/9/6
Y1 - 2016/9/6
N2 - 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.
AB - 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.
KW - Micro-scale simulation
KW - Running traffic
KW - Urban canyon concentration
KW - Vehicle dispersion
UR - http://www.scopus.com/inward/record.url?scp=84988842338&partnerID=8YFLogxK
U2 - 10.1127/metz/2016/0797
DO - 10.1127/metz/2016/0797
M3 - Article
AN - SCOPUS:84988842338
VL - 25
SP - 479
EP - 487
JO - Meteorologische Zeitschrift
JF - Meteorologische Zeitschrift
SN - 0941-2948
IS - 4
ER -