File(s) under permanent embargo
Reason: This item is currently closed access.
Urban design factors influencing heat island intensity in high-rise high-density environments of Hong Kong
journal contribution
posted on 2010-01-04, 16:02 authored by Renganathan Giridharan, S.S.Y. Lau, S. Ganesan, B. GivoniPrevious research on Urban Heat Island Intensity (UHI) in Hong Kong was limited to 4 weeks of field measurements during the
summer in 3 major coastal housing estates. The current study extends this work to 6 months enveloping 3 ‘‘seasons’’ and 7 different
locations within the coastal area. Variations in UHI in the range 1.3 1 to 3.4 1C were recorded. The study reveals seasonal changes are in
general more influential on UHI than changes due to geographical characteristics. Among the seasonal models, the peak summer clear
sky day’s daytime and nocturnal models examined separately were found to provide the clearest indicators of the impact of urban design
variables on UHI with R2 value of 0.7 and 0.8, respectively. Sky view factor, surface albedo, altitude, vegetation above 1m in height,
average height to floor area ratio, location quotient and proximity to sea are critical variables in mitigating both daytime and nocturnal
UHI. Combining daytime and nocturnal data dilutes the impact of extreme values on UHI, by up to 50%, and is not useful for design
solutions. Ideally design solutions may respond to the adverse impacts recorded in peak summer clear sky daytime at the concept design
stage, and then have the design manipulated and validated for other seasons.
History
School
- Architecture, Building and Civil Engineering
Citation
GIRIDHARAN, R. ... et al, 2007. Urban design factors influencing heat island intensity in high-rise high-density environments of Hong Kong. Building and Environment, 42 (10), pp.3669-3684.Publisher
© ElsevierVersion
- NA (Not Applicable or Unknown)
Publication date
2007Notes
This article is closed access. It was published in the journal, Building and Environment [© Elsevier] and the definitive version is available at: www.elsevier.com/locate/buildenvISSN
0360-1323Language
- en