Effect of uneven building layout on air flow and pollutant dispersion in non-uniform street canyons | |
Gu, ZL (Gu, Zhao-Lin)1,4; Zhang, YW (Zhang, Yun-Wei)2; Cheng, Y (Cheng, Yan)1,3; Lee, SC (Lee, Shun-Cheng)3 | |
刊名 | BUILDING AND ENVIRONMENT |
2011-12-30 | |
卷号 | 46期号:12页码:2657-2665 |
关键词 | Uneven building layout Non-uniform street canyon LES Air flow Pollutant dispersion |
DOI | 10.1016/j.buildenv.2011.06.028 |
文献子类 | 期刊论文 |
英文摘要 | Uneven building layouts and non-uniform street canyons are common in actual urban morphology. To study the effects of building layouts on air flow in non-uniform street canyons, various building arrangements are designed in this study. Simulations are carried out under four cases (i.e., a uniform street canyon as Case 1 and three non-uniform canyons as Cases 2-4) with parameter change of the occupying ratio of high buildings (ORHB) in the computational domain and their bilateral allocation as well as the combinations of stepup and/or stepdown notches. In the three non-uniform canyons, stepup and stepdown notches are separating (with ORHB of 25% for Case 2 and 75% for Case 4) or adjoining (with ORHB of 50% for Case 3). The air flow and pollutant dispersion in these street canyons are investigated using Large-eddy Simulation (LES). The air flow structures in the non-uniform street canyons are more complicated than in the uniform street canyon. Inside the non-uniform street canyons, the tilting, horizontal divergence and convergence of wind streamlines are found. Large-scale air exchanges of air mass inside and above the street canyons are found as well. At the pedestrian level, the concentrations of simulated pollutants (e.g., the mean and maximum concentrations) in the non-uniform street canyons are lower than those in the uniform one, suggesting that uneven building layouts are capable of improving the dispersion of pollutants in urban area. Further studies on Case 2-4 show that the separation of stepup and stepdown notches along the street increases the wind velocities in the vicinity of high buildings, while the adjoining of stepup and stepdown notches decreases the wind velocities. Low concentrations of pollutant at the pedestrian level are found in Case 2 compared to Cases 3 and 4. Thus, the separation of stepup and stepdown notches in non-uniform street canyons might be a good choice for uneven building layout arrangements from the point of view of pollutant dispersion and human health. |
语种 | 英语 |
内容类型 | 期刊论文 |
源URL | [http://ir.ieecas.cn/handle/361006/10342] |
专题 | 地球环境研究所_黄土与第四纪地质国家重点实验室(2010~) |
通讯作者 | Gu, ZL (Gu, Zhao-Lin)1,4 |
作者单位 | 1.School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, China; 2.School of Energy and Power Engineering, Xi’an Jiaotong University, China; 3.Department of Civil and Structural Engineering, Hong Kong Polytechnic University, Hong Kong, China; 4.SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, China |
推荐引用方式 GB/T 7714 | Gu, ZL ,Zhang, YW ,Cheng, Y ,et al. Effect of uneven building layout on air flow and pollutant dispersion in non-uniform street canyons[J]. BUILDING AND ENVIRONMENT,2011,46(12):2657-2665. |
APA | Gu, ZL ,Zhang, YW ,Cheng, Y ,&Lee, SC .(2011).Effect of uneven building layout on air flow and pollutant dispersion in non-uniform street canyons.BUILDING AND ENVIRONMENT,46(12),2657-2665. |
MLA | Gu, ZL ,et al."Effect of uneven building layout on air flow and pollutant dispersion in non-uniform street canyons".BUILDING AND ENVIRONMENT 46.12(2011):2657-2665. |
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