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Article: Lowering the outdoor temperature in high-rise high-density residential developments of coastal Hong Kong: The vegetation influence

TitleLowering the outdoor temperature in high-rise high-density residential developments of coastal Hong Kong: The vegetation influence
Authors
KeywordsLate summer days
On-site variables
Peak summer clear sky days (PSCS-days)
Peak summer partially cloudy days (PSPC-days)
Shrub cover
Tree cover
Urban heat island intensity (UHI)
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
Citation
Building And Environment, 2008, v. 43 n. 10, p. 1583-1595 How to Cite?
AbstractThis paper investigates the impact of on-site variables on the influence of vegetation in lowering outdoor temperature. The study uses six critical on-site variables such as surface albedo, sky view factor, altitude, shrub cover, tree cover and average height to floor area ratio to carry out analysis in five data sets. The climatic parameters and physical characteristics were measured and surveyed, respectively in 216 stations in high-rise high-density residential developments of coastal Hong Kong. The data set is mainly categorised into peak summer clear sky days (PSCS-days), peak summer partially cloudy days (PSPC-days) and late summer days to address the issues related to cloudy sky conditions in Hong Kong. The trend analysis shows that at a lower sky view factor, ranging from 0.1 to 0.25, shrub cover as low as 10-15% in a 1000 m2 open area is more effective in reducing outdoor temperature than the same level of tree cover in a location with a higher sky view factor (0.4 or above). The regression models used in this study were able to explain the influence of on-site variables on vegetation in lowering the outdoor temperature within the respective urban settings. In high-rise high-density environments, on-site variables such as sky view factor and altitude have a substantial impact on the influence of vegetation in lowering outdoor temperature. However, off-site variables such as high urban density and anthropogenic heat could negate the behaviour of sky view factor and altitude. The study suggests that increasing the tree cover from 25% to 40% in the pocket parks in coastal area residential developments of Hong Kong could reduce daytime urban heat island intensity (UHI) by further 0.5 °C. © 2007 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/57945
ISSN
2015 Impact Factor: 3.394
2015 SCImago Journal Rankings: 2.121
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Government Research Grants CouncilHKU7309/03 H
Funding Information:

The authors would like to thank, Dr. Milo Hoffman, Faculty of Architecture and Town Planning, Israel Institute of Technology for reviewing the paper and providing valuable assistance in structuring the problem. We extend our sincere thanks to the following research assistants-Yannis, Iris, Stephen, Kim, Roy, Vora, Yin, Gary, Vincent, Henry and Joyce for their hard work during the field measurement and data formulation. Ms Diana Leung, Environmental Laboratory Technician, Department of Architecture, was instrumental in selecting the appropriate instruments for fieldwork. Special thanks to Harshana (HKU) for editorial assistance. This research work is sponsored by the Hong Kong Government Research Grants Council (Project no. HKU7309/03 H). Finally, we would like to thank the reviewers for the valuable suggestions and comments.

References

 

DC FieldValueLanguage
dc.contributor.authorGiridharan, Ren_HK
dc.contributor.authorLau, SSYen_HK
dc.contributor.authorGanesan, Sen_HK
dc.contributor.authorGivoni, Ben_HK
dc.date.accessioned2010-05-31T03:21:08Z-
dc.date.available2010-05-31T03:21:08Z-
dc.date.issued2008en_HK
dc.identifier.citationBuilding And Environment, 2008, v. 43 n. 10, p. 1583-1595en_HK
dc.identifier.issn0360-1323en_HK
dc.identifier.urihttp://hdl.handle.net/10722/57945-
dc.description.abstractThis paper investigates the impact of on-site variables on the influence of vegetation in lowering outdoor temperature. The study uses six critical on-site variables such as surface albedo, sky view factor, altitude, shrub cover, tree cover and average height to floor area ratio to carry out analysis in five data sets. The climatic parameters and physical characteristics were measured and surveyed, respectively in 216 stations in high-rise high-density residential developments of coastal Hong Kong. The data set is mainly categorised into peak summer clear sky days (PSCS-days), peak summer partially cloudy days (PSPC-days) and late summer days to address the issues related to cloudy sky conditions in Hong Kong. The trend analysis shows that at a lower sky view factor, ranging from 0.1 to 0.25, shrub cover as low as 10-15% in a 1000 m2 open area is more effective in reducing outdoor temperature than the same level of tree cover in a location with a higher sky view factor (0.4 or above). The regression models used in this study were able to explain the influence of on-site variables on vegetation in lowering the outdoor temperature within the respective urban settings. In high-rise high-density environments, on-site variables such as sky view factor and altitude have a substantial impact on the influence of vegetation in lowering outdoor temperature. However, off-site variables such as high urban density and anthropogenic heat could negate the behaviour of sky view factor and altitude. The study suggests that increasing the tree cover from 25% to 40% in the pocket parks in coastal area residential developments of Hong Kong could reduce daytime urban heat island intensity (UHI) by further 0.5 °C. © 2007 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenven_HK
dc.relation.ispartofBuilding and Environmenten_HK
dc.subjectLate summer daysen_HK
dc.subjectOn-site variablesen_HK
dc.subjectPeak summer clear sky days (PSCS-days)en_HK
dc.subjectPeak summer partially cloudy days (PSPC-days)en_HK
dc.subjectShrub coveren_HK
dc.subjectTree coveren_HK
dc.subjectUrban heat island intensity (UHI)en_HK
dc.titleLowering the outdoor temperature in high-rise high-density residential developments of coastal Hong Kong: The vegetation influenceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0360-1323&volume=43&issue=10&spage=1583&epage=1595&date=2008&atitle=Lowering+the+outdoor+temperature+in+high-rise+high-density+residential+developments+of+coastal+Hong+Kong:+the+vegetation+influenceen_HK
dc.identifier.emailLau, SSY:ssylau@hku.hken_HK
dc.identifier.authorityLau, SSY=rp01006en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.buildenv.2007.10.003en_HK
dc.identifier.scopuseid_2-s2.0-45449101543en_HK
dc.identifier.hkuros147107en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-45449101543&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume43en_HK
dc.identifier.issue10en_HK
dc.identifier.spage1583en_HK
dc.identifier.epage1595en_HK
dc.identifier.isiWOS:000260364500004-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridGiridharan, R=7801607708en_HK
dc.identifier.scopusauthoridLau, SSY=24734045900en_HK
dc.identifier.scopusauthoridGanesan, S=7102439694en_HK
dc.identifier.scopusauthoridGivoni, B=7004481980en_HK

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