A Comparison Study Between Near Roadway
Measurements And Air Pollutant
Dispersion Simulations Using An Improved
Line Source Model
Author(s)
R. Briant, C. Seigneur, M. Gadrat & C. Bugajny
Abstract
Gaussian plume models, which are widely used to model atmospheric dispersion,
provide an exact analytical solution for line sources, such as roads, only when
the wind direction is perpendicular to the road. Some approximations have been
developed to provide an analytical formula for a line source when the wind
direction is not perpendicular to the road; however, such formulas lead to some
error and the solution diverges when the wind direction is parallel to the road.
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, combined with a Romberg integration to account for the road section
width, has then been used to simulate NOx concentrations in two large case
studies (1371 road sections for the first case study and 100 for the second). NO2,
NO and O3 concentrations are then computed using the photostationary-state
approximation. Finally, NO2 concentrations were successfully compared with
near-roadway measurements made at various locations in the domain area (224
locations for the first case study and 70 locations for the second). Results obtained
with a standard model used for regulatory applications, ADMS, are also presented.
Keywords: Gaussian plume model, line source, polyphemus, ADMS.
Keywords
Gaussian plume model, line source, polyphemus, ADMS
Related Book
Other papers in this volume
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