Urban design factors influencing heat island intensity in high-rise high-density environments of Hong Kong

Giridharan, R., Lau, S.S.Y., Ganesan, S., Givoni, B. (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. ISSN 0360-1323. (doi:10.1016/j.buildenv.2006.09.011) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://doi.org/10.1016/j.buildenv.2006.09.011

Abstract

Previous 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 ° to 3.4 °C 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 R2value of 0.7 and 0.8, respectively. Sky view factor, surface albedo, altitude, vegetation above 1 m 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.

Item Type: Article
DOI/Identification number: 10.1016/j.buildenv.2006.09.011
Uncontrolled keywords: Seasonal changes; Peak summer clear sky days; Peak summer partially cloudy days; Later summer days; Urban design variables; Territorial impact; Causal effect housing estate (residential development)
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
T Technology > TH Building construction
Divisions: Faculties > Humanities > Architecture
Depositing User: Giridharan Renganathan
Date Deposited: 07 Dec 2015 15:37 UTC
Last Modified: 29 May 2019 16:13 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51301 (The current URI for this page, for reference purposes)
Giridharan, R.: https://orcid.org/0000-0002-8627-5616
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