Original title: Quadrant analysis of turbulent pollution flux above the modelled street intersection
Authors: Kukačka, Libor ; Nosek, Štěpán ; Kellnerová, Radka ; Jurčáková, Klára ; Jaňour, Zbyněk
Document type: Papers
Conference/Event: Experimental Fluid Mechanics 2012 /7./, Hradec Králové (CZ), 2012-11-20 / 2012-11-23
Year: 2012
Language: eng
Abstract: The objective of this experimental study is to determine processes of a vertical turbulent pollution transport above the X-shaped street intersection in an idealised symmetric urban area for several approach flow directions. An experimental set-up for simultaneous measurement of the flow velocity and the tracer gas con-centration in a high temporal resolution is assembled. Vertical turbulent scalar fluxes are computed from the measured data in a horizontal plane above the street intersection. The quadrant analysis was applied to the vertical turbulent pollution fluxes data. Events with dominant contribution to vertical turbulent pollution flux were detected. The mean duration, repetition frequency and the duration percentage were computed for these events. A strong influence of the approach flow direction on the type of dominant events and their characteristics was resolved.
Keywords: air pollution; atmospheric boundary layer; contaminant spreading; quadrant analysis; wind tunnel modelling
Project no.: GAP101/12/1554 (CEP), CEZ:AV0Z20760514 (CEP)
Host item entry: Experimental Fluid Mechanics 2012, ISBN 978-80-7372-912-7

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0217645

Permalink: http://www.nusl.cz/ntk/nusl-142333

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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
 Record created 2013-01-31, last modified 2017-01-18

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