Measurements of Traffic-Induced Turbulence within a Street Canyon during the Nantes'99 Experiment |
| |
Authors: | G Vachon P Louka J-M Rosant PG Mestayer J-F Sini |
| |
Institution: | (1) Laboratoire de Mécanique des Fluides UMR 6598 CNRS – Ecole Centrale de Nantes, 1 rue de la Noë, BP 92101, F-44321 Nantes Cedex 3, France;(2) Present address: Centre Scientifique et Technique du Bâtiment –, 11, rue Henri Picherit, BP 82341, 44323 Nantes Cedex 3, France |
| |
Abstract: | A full scale experiment has been performed in a streetcanyon, the Rue de Strasbourg in Nantes (France). Thiscampaign, the Nantes'99 experiment, provided a detaileddata base documenting, amongst others, the production ofturbulent kinetic energy (TKE) by vehicles within thestreet. Airflow and CO concentration measurements have beenanalysed during days with low wind perpendicular to thestreet axis, i.e. for conditions expected to greatly favourthe enhancement of the turbulence produced by traffic onflow and dispersion within the street canyon. It is shownthat traffic is associated with an increase in turbulentkinetic energy at the lowest levels of the street,especially at the leeward side of the street. It issuggested that turbulent kinetic energy increases with thenumber of vehicles up to a threshold value and thendecreases when vehicles form a `block' shape that limitsthe additional production of turbulence. Moreover, it issuggested that traffic-produced turbulence affectspollutant dispersion reducing CO concentration at the lowerlevels of the leeward side of the street from a thresholdvalue of TKE equal to about 0.15 m2 s-2. On the other hand, high traffic density generates less turbulencewhich in turn leads to a lower pollutant dispersion. |
| |
Keywords: | full-scale experiment low wind conditions pollutant dispersion street canyon traffic-produced turbulence |
本文献已被 SpringerLink 等数据库收录! |
|