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| Titel |
Evaluation of roadway Gaussian plume models with large-scale measurement campaigns |
| VerfasserIn |
R. Briant, C. Seigneur, M. Gadrat, C. Bugajny |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 2 ; Nr. 6, no. 2 (2013-04-03), S.445-456 |
| Datensatznummer |
250017801
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| Publikation (Nr.) |
 copernicus.org/gmd-6-445-2013.pdf |
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| Zusammenfassung |
| Gaussian models are commonly used to simulate atmospheric pollutant
dispersion near sources because they provide an efficient compromise between
reasonable accuracy and manageable computational time. The Gaussian
dispersion formula provides an exact solution to the atmospheric diffusion
equation for the dispersion of a pollutant emitted from a point
source. However, the Gaussian dispersion formula for a line source, which is
convenient to model emissions from on-road traffic, is exact only when the
wind is perpendicular to the line source. A novel approach that reduces the
error in the line source formula when the wind direction is not
perpendicular to the road was recently developed. This model is used to
simulate NOx concentrations in a large case study (1371 road sections
representing about 831 km). NO2, NO and O3
concentrations are then computed using the photostationary-state
approximation. NO2 concentrations are compared with measurements made
at 242 locations in the domain area. Model performance is satisfactory with
mean normalised errors of 22% (winter month) to 31% (summer
month). Results obtained here are also compared with those obtained with a
previous formulation and with a standard model used for regulatory
applications, ADMS-Urban. Discrepancies among the results obtained with
those models are discussed. |
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