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Article: The influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areas

TitleThe influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areas
Authors
KeywordsBuilding height
Building layout
Canopy heights
Cfd simulations
Ground-level
Issue Date2012
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
Citation
Building and Environment, 2012, v. 56, p. 346-360 How to Cite?
Abstract
Studies are still required to understand how rural/marine wind remove ground-level pollutants released uniformly in street networks of high-rise urban areas. The link between building height variability and pollutant removal process still remains unclear. Several idealized urban-like neighbourhoods made of 9-row and 18-row small-scale high-rise square arrays (building width B = street width W, building packing density λ p = 0.25) were first numerically studied with a parallel approaching wind and neglecting thermal effects. Normalized pollutant transport rates and pedestrian purging flow rate were applied to quantify the contribution of pollutant removal by mean flow and turbulent diffusion and their net purging capacity. Results show that the prediction of isothermal turbulent flows agreed generally well with wind tunnel data. For 9-row arrays with building height variations (standard deviation of 0-57.1%) and the same average canopy height (H 0 = 2.33W), pollutant removal mainly depends on mean flows. Larger standard deviations tend to induce better pedestrian ventilation. In comparison to small and large standard deviations, medium values of 14.3-42.9% may experience smaller purging capacity by horizontal mean flows but significantly enhance that by vertical mean flows. For arrays with uniform heights, lowering aspect ratios (H/W = 2.33 and 2.67-1.5) or increasing street lengths (9-row to 18-row) may enhance the contribution of removing pollutants by turbulent diffusions across canopy roofs which may be similarly important as that by mean flows. Although further investigations are still required, this paper clarifies the relationship between building layouts, height variability and removal potential of ground-level pollutants in high-rise urban-like geometries. © 2012 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/157193
ISSN
2013 Impact Factor: 2.700
2013 SCImago Journal Rankings: 1.634
ISI Accession Number ID
Funding AgencyGrant Number
Small Project Funding from University of Hong Kong201007176175
project title of "Quantifying the effect of building height variation on pollutant removal and heat removal from high-rise compact building arrays"
National Natural Science Foundation of China51108102
Funding Information:

This study was financially supported by the Small Project Funding from the University of Hong Kong (Project code: 201007176175) with the project title of "Quantifying the effect of building height variation on pollutant removal and heat removal from high-rise compact building arrays" and by the National Natural Science Foundation of China (No. 51108102). The special concern from the Planning Department of Hong Kong Government is also gratefully acknowledged.

References

 

Author Affiliations
  1. The University of Hong Kong
  2. Hogskolan i Gavle
  3. null
  4. Guangzhou University
DC FieldValueLanguage
dc.contributor.authorHang, Jen_US
dc.contributor.authorLi, Yen_US
dc.contributor.authorSandberg, Men_US
dc.contributor.authorBuccolieri, Ren_US
dc.contributor.authorDisabatino, Sen_US
dc.date.accessioned2012-08-08T08:45:45Z-
dc.date.available2012-08-08T08:45:45Z-
dc.date.issued2012en_US
dc.identifier.citationBuilding and Environment, 2012, v. 56, p. 346-360en_US
dc.identifier.issn0360-1323en_US
dc.identifier.urihttp://hdl.handle.net/10722/157193-
dc.description.abstractStudies are still required to understand how rural/marine wind remove ground-level pollutants released uniformly in street networks of high-rise urban areas. The link between building height variability and pollutant removal process still remains unclear. Several idealized urban-like neighbourhoods made of 9-row and 18-row small-scale high-rise square arrays (building width B = street width W, building packing density λ p = 0.25) were first numerically studied with a parallel approaching wind and neglecting thermal effects. Normalized pollutant transport rates and pedestrian purging flow rate were applied to quantify the contribution of pollutant removal by mean flow and turbulent diffusion and their net purging capacity. Results show that the prediction of isothermal turbulent flows agreed generally well with wind tunnel data. For 9-row arrays with building height variations (standard deviation of 0-57.1%) and the same average canopy height (H 0 = 2.33W), pollutant removal mainly depends on mean flows. Larger standard deviations tend to induce better pedestrian ventilation. In comparison to small and large standard deviations, medium values of 14.3-42.9% may experience smaller purging capacity by horizontal mean flows but significantly enhance that by vertical mean flows. For arrays with uniform heights, lowering aspect ratios (H/W = 2.33 and 2.67-1.5) or increasing street lengths (9-row to 18-row) may enhance the contribution of removing pollutants by turbulent diffusions across canopy roofs which may be similarly important as that by mean flows. Although further investigations are still required, this paper clarifies the relationship between building layouts, height variability and removal potential of ground-level pollutants in high-rise urban-like geometries. © 2012 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenven_US
dc.relation.ispartofBuilding and Environmenten_US
dc.subjectBuilding heighten_US
dc.subjectBuilding layouten_US
dc.subjectCanopy heightsen_US
dc.subjectCfd simulationsen_US
dc.subjectGround-levelen_US
dc.titleThe influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areasen_US
dc.typeArticleen_US
dc.identifier.emailBuccolieri, R: riccardo.buccolieri@unisalento.iten_US
dc.identifier.emailHang, J: hangjian@hku.hk-
dc.identifier.emailLi, Y: liyg@hkucc.hku.hk-
dc.identifier.authorityLi, Y=rp00151en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.buildenv.2012.03.023en_US
dc.identifier.scopuseid_2-s2.0-84860304696en_US
dc.identifier.hkuros209883-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84860304696&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume56en_US
dc.identifier.spage346en_US
dc.identifier.epage360en_US
dc.identifier.isiWOS:000305315700036-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridHang, J=35240092500en_US
dc.identifier.scopusauthoridLi, Y=7502094052en_US
dc.identifier.scopusauthoridSandberg, M=35585315900en_US
dc.identifier.scopusauthoridBuccolieri, R=22978582300en_US
dc.identifier.scopusauthoridDi Sabatino, S=22979043500en_US
dc.identifier.citeulike10621312-

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