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Article: Substrate moisture effect on water balance and thermal regime of a tropical extensive green roof

TitleSubstrate moisture effect on water balance and thermal regime of a tropical extensive green roof
Authors
KeywordsGreen roof
Mass effects
Moisture storage
Thermal performance
Water depletions
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/ecoleng
Citation
Ecological Engineering, 2012, v. 47, p. 9-23 How to Cite?
AbstractGreen-roof thermal and hydrological performance has been extensively studied, but the specific effect of substrate moisture has received little attention. This study investigates the substrate moisture effect on evapotranspiration (ET), water balance and subaerial and subsurface temperatures of an extensive tropical green roof. Firstly, three weather types (sunny, cloudy and rainy) in conjunction with three substrate moisture states (wet, moist and dry) generate nine permutations for a scenario analysis. Secondly, the correlation analysis explores the relationship between substrate moisture and thermal performance indicators. The major finding is that substrate moisture is effective in regulating substrate thermal behavior, but less so in enhancing ET and associated cooling. Substrate moisture can notably cool the soil, rockwool and concrete tile on sunny days, and warm them on cloudy and rainy days. In contrast, substrate moisture has limited effect on ET, which is largely dependent on solar radiation, relative humidity and wind speed. The dry substrate on sunny day demonstrates an aberrant behavior of high ET which contradicts with previous studies. This unusual phenomenon is explained by the limited substrate mass effect of the thin extensive green roof. The vegetation surface and air temperatures show little variations between different soil moisture states, and their correlations with substrate moisture are insignificant. The findings could provide an additional substrate moisture dimension to enhance the design and management of green roofs with reference to water and thermal behavior. © 2012 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/164783
ISSN
2015 Impact Factor: 2.74
2015 SCImago Journal Rankings: 1.112
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorJim, CYen_US
dc.contributor.authorPeng, LLHen_US
dc.date.accessioned2012-09-20T08:09:23Z-
dc.date.available2012-09-20T08:09:23Z-
dc.date.issued2012en_US
dc.identifier.citationEcological Engineering, 2012, v. 47, p. 9-23en_US
dc.identifier.issn0925-8574-
dc.identifier.urihttp://hdl.handle.net/10722/164783-
dc.description.abstractGreen-roof thermal and hydrological performance has been extensively studied, but the specific effect of substrate moisture has received little attention. This study investigates the substrate moisture effect on evapotranspiration (ET), water balance and subaerial and subsurface temperatures of an extensive tropical green roof. Firstly, three weather types (sunny, cloudy and rainy) in conjunction with three substrate moisture states (wet, moist and dry) generate nine permutations for a scenario analysis. Secondly, the correlation analysis explores the relationship between substrate moisture and thermal performance indicators. The major finding is that substrate moisture is effective in regulating substrate thermal behavior, but less so in enhancing ET and associated cooling. Substrate moisture can notably cool the soil, rockwool and concrete tile on sunny days, and warm them on cloudy and rainy days. In contrast, substrate moisture has limited effect on ET, which is largely dependent on solar radiation, relative humidity and wind speed. The dry substrate on sunny day demonstrates an aberrant behavior of high ET which contradicts with previous studies. This unusual phenomenon is explained by the limited substrate mass effect of the thin extensive green roof. The vegetation surface and air temperatures show little variations between different soil moisture states, and their correlations with substrate moisture are insignificant. The findings could provide an additional substrate moisture dimension to enhance the design and management of green roofs with reference to water and thermal behavior. © 2012 Elsevier B.V.-
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/ecolengen_US
dc.relation.ispartofEcological Engineeringen_US
dc.subjectGreen roof-
dc.subjectMass effects-
dc.subjectMoisture storage-
dc.subjectThermal performance-
dc.subjectWater depletions-
dc.titleSubstrate moisture effect on water balance and thermal regime of a tropical extensive green roofen_US
dc.typeArticleen_US
dc.identifier.emailJim, CY: hragjcy@hku.hken_US
dc.identifier.authorityJim, CY=rp00549en_US
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.ecoleng.2012.06.020-
dc.identifier.scopuseid_2-s2.0-84864053206-
dc.identifier.hkuros207811en_US
dc.identifier.volume47en_US
dc.identifier.spage9en_US
dc.identifier.epage23en_US
dc.identifier.isiWOS:000309433600002-
dc.publisher.placeNetherlands-
dc.identifier.citeulike11610374-

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