Micrometeorological Measurements in a Street Canyon during the Joint ATREUS-PICADA Experiment |
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Authors: | Marcin Idczak Patrice Mestayer Jean-Michel Rosant Jean-Francois Sini Michel Violleau |
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Institution: | (1) Laboratoire de Mécanique des Fluides, UMR 6598 CNRS, Ecole Centrale de Nantes, BP 92101, F44321 Nantes, France;(2) Institude of Heating and Ventilation, Warsaw University of Technology, Warsaw, Poland |
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Abstract: | In order to investigate the microclimatic conditions in a street canyon, a physical model was used to conduct the Joint ATREUS-PICADA
Experiment (JAPEX) in situ experimental campaign. Four lines of buildings simulated by steel containers were installed to
form three parallel street canyons at 1:5 scale, with width/height aspect ratio approximately 0.40. The reference wind and
atmospheric conditions were measured, as well as the flow velocity and direction in the street. Preliminary results concern
street canyon ventilation and thermal effects on in-canyon airflow, and show that vortical motions appear for reference wind
directions perpendicular to the street axis. The presence of adjacent rows of buildings did not appear to significantly influence
the flow character within the canyon for the case of a low aspect ratio corresponding to a skimming flow regime. The flow
structure was not significantly affected by the thermal effects although some slight interference occurred in the lower part
of the canyon. An analysis of horizontal temperature gradients indicated that a thin boundary layer develops near the heated
facade. These facts imply that the thermal effects are considerable only very close to the wall. |
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Keywords: | Field experiment Parallel streets Solar radiation Street canyon flows Thermal effects Urban canyon |
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