Abstract
In order to clarify the impact of trees on flow and concentration fields inside street
canyons, measurements have been performed with a small scale wind tunnel model of an idealized
urban street canyon. The model setup consists of two parallel aligned rows of houses forming
the canyon and a tracer gas emitting line source for simulating traffic exhaust releases.
Model trees with spherical crowns have been arranged along the canyon center axis. The setup
was exposed to an approach flow perpendicular to the street axis and tracer gas concentrations at
both canyon walls were measured. In the presence of trees, increasing values of exhaust concentrations at the leeward wall and decreasing concentrations at the windward wall were found. Velocity measurements reveal an extensive impact of trees on the flow field. Typical vortex structures observed in obstacle free street canyons were either significantly weakened or no longer
present.
Original language | English |
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Title of host publication | Proceedings of the 12th International Conference on Wind Engineering, 1-6 July 2007, Cairns, Australia |
Pages | 1-8 |
Publication status | Published - 2007 |