Quadrant analysis of turbulent pollution flux above the modelled street intersection

0388712 - ÚT 2013 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Kukačka, Libor - Nosek, Štěpán - Kellnerová, Radka - Jurčáková, Klára - Jaňour, Zbyněk
Quadrant analysis of turbulent pollution flux above the modelled street intersection.
Experimental Fluid Mechanics 2012. Liberec: Technical University of Liberec, 2012 - (Vít, T.; Dančová, P.; Novotný, P.), s. 375-382. ISBN 978-80-7372-912-7.
[Experimental Fluid Mechanics 2012 /7./. Hradec Králové (CZ), 20.11.2012-23.11.2012]
Grant CEP: GA ČR GAP101/12/1554
Výzkumný záměr: CEZ:AV0Z20760514
Klíčová slova: air pollution * atmospheric boundary layer * wind tunnel modelling * contaminant spreading * quadrant analysis
Kód oboru RIV: DG - Vědy o atmosféře, meteorologie

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.
Trvalý link: http://hdl.handle.net/11104/0217645