NDLI: Ventilation Processes in a Three-Dimensional Street Canyon

Content Provider	Springer Nature Link
Author	sek, Štěpán Kukačka, Libor Kellnerová, Radka Jurčáková, Klára Jaňour, Zbyněk
Copyright Year	2016
Abstract	The ventilation processes in three different street canyons of variable roof geometry were investigated in a wind tunnel using a ground-level line source. All three street canyons were part of an urban-type array formed by courtyard-type buildings with pitched roofs. A constant roof height was used in the first case, while a variable roof height along the leeward or windward walls was simulated in the two other cases. All street-canyon models were exposed to a neutrally stratified flow with two approaching wind directions, perpendicular and oblique. The complexity of the flow and dispersion within the canyons of variable roof height was demonstrated for both wind directions. The relative pollutant removals and spatially-averaged concentrations within the canyons revealed that the model with constant roof height has higher re-emissions than models with variable roof heights. The nomenclature for the ventilation processes according to quadrant analysis of the pollutant flux was introduced. The venting of polluted air (positive fluctuations of both concentration and velocity) from the canyon increased when the wind direction changed from perpendicular to oblique, irrespective of the studied canyon model. Strong correlations ( $$>$$ 0.5) between coherent structures and ventilation processes were found at roof level, irrespective of the canyon model and wind direction. This supports the idea that sweep and ejection events of momentum bring clean air in and detrain the polluted air from the street canyon, respectively.
Starting Page	259
Ending Page	284
Page Count	26
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	159
Issue Number	2
e-ISSN	15731472
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-02-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coherent structures Line source Pollution flux measurements Street canyon Wind tunnel Atmospheric Sciences Meteorology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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Combining Wind-Tunnel and Field Measurements of Street-Canyon Flow via Stochastic Estimation

Tracer Flux Balance at an Urban Canyon Intersection

Three-Dimensional Mapping of Air Flow at an Urban Canyon Intersection

Scalar fluxes from urban street canyons. Part I: Laboratory simulation

Large-Eddy Simulation of Pollutant Removal from a Three-Dimensional Street Canyon

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