The Impact of Trees on Street Ventilation, NO_x and PM_2.5 Concentrations Across Heights in Marylebone Rd Street Canyon, Central London

This paper assesses the effects of trees (Platanus x hispanica) of different leaf area density on ventilation, NO_x and PM_2.5 concentrations across heights in Marylebone Rd street canyon in London (UK). Computational Fluid Dynamics steady state simulations are performed with OpenFOAM. The ventilation is evaluated through flow patterns and the analysis of the impact of trees on wind speed, turbulence kinetic energy, flow rates, mean and turbulent pollutant exchanges. Results show that the effects of trees are local. For parallel winds planting new trees is positive since flow channelling and turbulence distribute the pollutant over the height which is removed by both mean flow and turbulent fluctuations through the roof. Both areas close and far from the trees within the road have a beneficial effect, with pedestrian average concentration reductions up to 18% due to aerodynamic effects. For perpendicular winds recirculation zones diminish the dispersion of pollutants and the introduction of trees has an additional negative effect with local average concentration increase up to 108% close to trees. Overall, the positive deposition effects are larger for increased LAD and for perpendicular winds may counterbalance the negative aerodynamic effects at locations close to trees.

• Record URL:
  https://doi.org/10.1016/j.scs.2018.05.030
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S2210670717314087
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/22106707
• Supplemental Notes:
  • © 2018 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Buccolieri, Riccardo
  • Jeanjean, Antoine P.R
  • Gatto, Elisa
  • Leigh, Roland J
• Publication Date: 2018-8

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 227-241
• Serial:
  • Sustainable Cities and Society
  • Volume: 41
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 2210-6707
  • Serial URL: http://www.sciencedirect.com/science/journal/22106707?sdc=2

Subject/Index Terms

• TRT Terms: Air quality; Fluid dynamics; Nitrogen oxides; Particulates; Simulation; Streets; Trees
• Identifier Terms: OpenFOAM (software)
• Geographic Terms: London (England)
• Subject Areas: Environment; Highways;

Filing Info

• Accession Number: 01679372
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 27 2018 2:06PM