Experimental Study Of Atmospheric 3D
Dispersion Of A Passive Tracer In Urban
Environment: Comparison With Briggs Urban
Model
Author(s)
M. Francis, D. Maro, O. Connan, D. Hebert, M. Goriaux,
B. Letellier & P. Defenouillere
Abstract
FluSAP 2010, a part of a large federative research program Vegdud (2010–2013)
funded by the French National Research Agency, is an experimental campaign
aiming to improve our knowledge on the dispersion of a plume in heterogeneous
urban zones. For this, the French Institute for Radiological Protection and
Nuclear Safety (IRSN) conducted an experimental campaign in the city of
Nantes (France) to study atmospheric dispersion. A gas tracer SF6 was released
in the atmosphere and measured at different altitudes (from 1 to 100 m) by using
a mast and a small tethered balloon. This allows determining the plume vertical
dispersion in an urban area as a function of atmospheric turbulence. A sampling
system was also used at ground (1 m height) in order to evaluate the plume
horizontal dispersion. All these systems were placed at a distance from the
emission point between 20 and 1150 m: 30 SF6 emissions were performed
between May 18 and May 27, 2010.
High compatibility was found between experimental horizontal and vertical
widths of the plume and Briggs urban model for the stability class B, C and D
according to Pasquill classification. However, this compatibility was only
confirmed for small distances from the source (till 370 m). For higher distances
from the source, it is hard to draw significant conclusions.
Keywords: atmospheric dispersion, experimental campaign, urban zone, Briggs
urban model.
Keywords
atmospheric dispersion, experimental campaign, urban zone, Briggs
urban model.
Related Book
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