Article: The influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areas
| Title | The influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areas | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Authors | Hang, J1 4 Li, Y1 Sandberg, M2 Buccolieri, R3 Disabatino, S3 | ||||||||
| Keywords | Building height Building layout Canopy heights Cfd simulations Ground-level | ||||||||
| Issue Date | 2012 | ||||||||
| Publisher | Pergamon. 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?] DOI: http://dx.doi.org/10.1016/j.buildenv.2012.03.023 | ||||||||
| 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. | ||||||||
| ISSN | 0360-1323 2011 Impact Factor: 2.4 2011 SCImago Journal Rankings: 0.080 | ||||||||
| DOI | http://dx.doi.org/10.1016/j.buildenv.2012.03.023 | ||||||||
| ISI Accession Number ID | WOS:000305315700036
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 | References in Scopus | ||||||||
| Grants | Quantifying the effect of building height variation on pollutant removal and heat removal from high-rise compact building arrays |
| dc.contributor.author | Hang, J | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| dc.contributor.author | Li, Y | ||||||||
| dc.contributor.author | Sandberg, M | ||||||||
| dc.contributor.author | Buccolieri, R | ||||||||
| dc.contributor.author | Disabatino, S | ||||||||
| dc.date.accessioned | 2012-08-08T08:45:45Z | ||||||||
| dc.date.available | 2012-08-08T08:45:45Z | ||||||||
| dc.date.issued | 2012 | ||||||||
| dc.description.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. | ||||||||
| dc.description.grant | Quantifying the effect of building height variation on pollutant removal and heat removal from high-rise compact building arrays | ||||||||
| dc.description.grantcode | 103953 | ||||||||
| dc.description.nature | Link_to_subscribed_fulltext | ||||||||
| dc.identifier.citation | Building and Environment, 2012, v. 56, p. 346-360 [How to Cite?] DOI: http://dx.doi.org/10.1016/j.buildenv.2012.03.023 | ||||||||
| dc.identifier.citeulike | 10621312 | ||||||||
| dc.identifier.doi | http://dx.doi.org/10.1016/j.buildenv.2012.03.023 | ||||||||
| dc.identifier.epage | 360 | ||||||||
| dc.identifier.hkuros | 209883 | ||||||||
| dc.identifier.isi | WOS:000305315700036
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. | ||||||||
| dc.identifier.issn | 0360-1323 2011 Impact Factor: 2.4 2011 SCImago Journal Rankings: 0.080 | ||||||||
| dc.identifier.scopus | eid_2-s2.0-84860304696 | ||||||||
| dc.identifier.spage | 346 | ||||||||
| dc.identifier.uri | http://hdl.handle.net/10722/157193 | ||||||||
| dc.identifier.volume | 56 | ||||||||
| dc.language | eng | ||||||||
| dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv | ||||||||
| dc.publisher.place | United Kingdom | ||||||||
| dc.relation.ispartof | Building and Environment | ||||||||
| dc.relation.references | References in Scopus | ||||||||
| dc.subject | Building height | ||||||||
| dc.subject | Building layout | ||||||||
| dc.subject | Canopy heights | ||||||||
| dc.subject | Cfd simulations | ||||||||
| dc.subject | Ground-level | ||||||||
| dc.title | The influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areas | ||||||||
| dc.type | Article |
Author Affiliations
- The University of Hong Kong
- Hogskolan i Gavle
- null
- Guangzhou University