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Analysis of Scalar Fluxes and Flow Within Modelled Intersection Depending on the Approach Flow Direction

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Book cover Air Pollution Modeling and its Application XXI

Abstract

The influence of the approach flow direction on contaminant spreading and ventilation within an intersection in an idealised symmetrical urban area was investigated in this study. Advective horizontal and vertical scalar fluxes are computed from measured data for five flow directions. The highest advective contaminant fluxes are measured in the bottom parts of street-canyons. The important role of the vertical turbulent scalar flux in ventilation of intersection is expected. Quadrant analysis of vertical flux of longitudinal momentum is used to determine a domination of sweep or ejection events above the intersection.

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Acknowledgments

Authors kindly thank Charles University for support by grant GAUK No. 136609 (115-10/259266), the Ministry of Education, Sports and Youth of the Czech Republic for support by AVOZ20760514 and support of the Academy of Sciences of the Czech Republic.

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Authors and Affiliations

  1. Department of Meteorology and Environment Protection, Charles University, Prague, Czech Republic

    Libor Kukačka & Radka Kellnerová

  2. Environmental Aerodynamics, Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v.v.i, Dolejškova 1402/5, Prague, 18200, Czech Republic

    Libor Kukačka, Radka Kellnerová, Klára Jurčáková & Zbyněk Jaňour

Authors
  1. Libor Kukačka
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  2. Radka Kellnerová
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  3. Klára Jurčáková
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  4. Zbyněk Jaňour
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Corresponding author

Correspondence to Libor Kukačka .

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Editors and Affiliations

  1. , Dept. of Earth and Ocean Sciences, University of British Columbia, Stores Road 6339, Vancouver, V6T 1Z4, British Columbia, Canada

    Douw G. Steyn

  2. CNR, Inst. of Atmospheric Sciences & Climate, Corsio Fiume 4, Torino, 10133, Italy

    Silvia Trini Castelli

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© 2011 Springer Science+Business Media B.V.

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Kukačka, L., Kellnerová, R., Jurčáková, K., Jaňour, Z. (2011). Analysis of Scalar Fluxes and Flow Within Modelled Intersection Depending on the Approach Flow Direction. In: Steyn, D., Trini Castelli, S. (eds) Air Pollution Modeling and its Application XXI. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1359-8_20

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