UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Investigating the Impact of Trees on Airflow within Street Canyons through the use of CFD and Field Measurements

Glover, N; (2015) Investigating the Impact of Trees on Airflow within Street Canyons through the use of CFD and Field Measurements. Doctoral thesis , UCL (University College London). Green open access

[img]
Preview
Text
Glover_thesis_Final_Nina_Glover.pdf

Download (30MB) | Preview

Abstract

The local wind climate within the urban environment plays a key role in the removal of heat and pollutants from pedestrian occupied areas as well as having an impact on pedestrian comfort and safety. One component of the urban landscape which is often neglected in the consideration of airflow is tree planting which can constitute a major component of the built environment. The aim of this research was therefore to gain a greater understanding into the effect of tree planting on airflow within street canyons and investigate the use of CFD modelling in predicting such effects. This aim was accomplished through the use of CFD modelling and field measurements of tree-lined and non tree-lined streets. Tree canopies were represented within the CFD model by porous subdomains containing momentum and turbulence sinks. This simple representation was found to offer favourable comparison against field measurements and would therefore provide a simple and effective method for the inclusion of trees within CFD models of the urban environment. Results of both the CFD models and field measurements found reduced wind speeds at pedestrian level as well as a significant reduction in vertical wind speeds at roof level within the tree-lined street. There was also seen to be a significant reduction in turbulence levels within the street containing trees. Based on these findings it can be concluded that trees are likely to be a useful aid in urban design helping to reduce high wind speeds and turbulence thus creating outdoor environments which are comfortable and safe for pedestrian use. However the results also indicate that the addition of trees to streets can reduce the amount of air exchange at roof top level that occurs and thus may lead to a reduction in natural ventilation and potential build-up of pollutants within pedestrian occupied areas.

Type: Thesis (Doctoral)
Title: Investigating the Impact of Trees on Airflow within Street Canyons through the use of CFD and Field Measurements
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/1472912
Downloads since deposit
254Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item