WIT Press

Dispersion Experiments With Tracer Gas In Oslo, Norway

Price

Free (open access)

Paper DOI

10.2495/AIR950232

Volume

10

Pages

8

Published

1995

Size

688 kb

Author(s)

D. Tonnesen

Abstract

Dispersion experiments using tracer gas technique were carried out in Oslo during stable stratification and calm wind conditions. Three sets of data were collected, from a street canyon, from an open area with high houses, and across a valley with cold-air drainage flow. The tracer gas release was set up as a line-source in the two first cases, and as point-sources using two different tracers in the third case. Vertical concentration profiles were measured by balloon in the first case and with a drone in the two last cases. The horizontal and vertical tracer gas concentration profiles have been parameterized using a gaussian type dispersion model. The experiments show that the vertical dispersion caused by vehicle induced turbulence is considerable even during stable stratification, and that there can be considera

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