Urban Greening Strategies for Enhancing Outdoor Thermal Comfort

Kevin Ka Lun Lau, Zheng Tan, Tobi Eniolu Morakinyo, Chao Ren

Research output: Chapter in book / Conference proceedingChapter in an edited book (as author)Academic researchpeer-review

1 Citation (Scopus)

Abstract

Hong Kong suffers from an intense urban heat island effect of up to 4 °C as a result of compact urban form and highly urbanised land cover. Enhancing the cooling efficiency of urban greenery is essential for improving the microclimate in high-density cities. This paper aims to delineate design strategies for urban greenery to maximise thermal benefits and mitigate the daytime UHI effect. Two site-specific design strategies for tree planting in the urban environment are proposed. The sky view factor-based design approach and the wind-path design approach are evaluated in the neighbourhood scale in two climate-sensitive areas with different urban morphologies. Observed data and simulation results indicated that the cooling effect of urban trees is highly associated with SVF. Air temperature reduction (a 1.5 °C reduction) is the most profound for the high-SVF scenario, whereas substantial radiation shading (Tmrt reduced to 34 °C) is detected in areas with medium–low SVFs. The modelling study also showed that the cooling of air temperature and sensible heat were twice as high for vegetation arranged in wind corridors than those for leeward areas. The study demonstrated that tree planting in conjunction with proper planning is an effective measure to mitigate daytime UHI.

Original languageEnglish
Title of host publicationSpringerBriefs in Architectural Design and Technology
PublisherSpringer
Pages85-100
Number of pages16
DOIs
Publication statusPublished - Sep 2021

Publication series

NameSpringerBriefs in Architectural Design and Technology
ISSN (Print)2199-580X
ISSN (Electronic)2199-5818

Keywords

  • High-density
  • Urban greenery
  • Urban heat island mitigation

ASJC Scopus subject areas

  • Architecture
  • Building and Construction
  • Modelling and Simulation
  • Computer Graphics and Computer-Aided Design

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