Right tree, right place (urban canyon): Tree species selection approach for optimum urban heat mitigation - development and evaluation
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AbstractThe re-integration of trees into the urban landscape is a veritable strategy for urban climate mitigation and adaptation. However, dysfunctional trees in terms of urban heat mitigation are dominant in many sub-tropical cities' landscapes due to the lack of scientific basis of tree selection. Therefore, this study proposes and evaluates a methodological framework as an approach for “right tree, right place” for urban heat mitigation through parametric ENVI-met simulations that involve the combination of 54 generic tree forms and 10 characteristic urban morphology – Sky-View Factor (SVF). Results show variable temperature regulation by tree forms (species) with varying magnitude in different urban morphology. Daytime and nighttime temperature regulation effects were between 0.3 °C – 1.0 °C and 0.0 °C – 2.0 °C, respectively depending on tree forms and SVF value. Furthermore, the Heat Reduction Potential (HRP) of trees forms were determined in terms of their human thermal comfort improvement. In general, we found a range of +5% and − 20% depending on SVF, negative and positive values imply heat reduction and increment, respectively. With the competing shading effect of buildings, the HRP of trees reduces from high to low SVF area with variable magnitude among tree forms (species). Hence, the proposed morphology-based tree selection approach was evaluated by comparison with two uninformed selection approaches in a realistic urban neighborhood in Hong Kong. Results clearly indicate the proposed approach's capability in improving human thermal comfort by up two times more than either of the other approaches. Finally, evidence-based recommendations were given for the reference of policy-makers when they make urban green development plan.
Acceptance Date19/02/2020
All Author(s) ListTobi Eniolu Morakinyo, Wanlu Ouyang, Kevin Ka-Lun Lau, Chao Ren, Edward Ng
Journal nameScience of the Total Environment
Year2020
Month6
Volume Number719
Article number137461
ISSN0048-9697
eISSN1879-1026
LanguagesEnglish-United States
KeywordsUHI, thermal comfortTree-plantingTree forms (species)Street-canyonUrban densities

Last updated on 2020-24-05 at 23:36