Název:
Quadrant analysis of turbulent pollution flux above the modelled street intersection
Autoři:
Kukačka, Libor ; Nosek, Štěpán ; Kellnerová, Radka ; Jurčáková, Klára ; Jaňour, Zbyněk Typ dokumentu: Příspěvky z konference Konference/Akce: Experimental Fluid Mechanics 2012 /7./, Hradec Králové (CZ), 2012-11-20 / 2012-11-23
Rok:
2012
Jazyk:
eng
Abstrakt: 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.
Klíčová slova:
air pollution; atmospheric boundary layer; contaminant spreading; quadrant analysis; wind tunnel modelling Číslo projektu: CEZ:AV0Z20760514 (CEP), GAP101/12/1554 (CEP) Poskytovatel projektu: GA ČR Zdrojový dokument: Experimental Fluid Mechanics 2012, ISBN 978-80-7372-912-7
Instituce: Ústav termomechaniky AV ČR
(web)
Informace o dostupnosti dokumentu:
Dokument je dostupný v příslušném ústavu Akademie věd ČR. Původní záznam: http://hdl.handle.net/11104/0217645