Numerical simulation of traffic-related particle dispersion in a real built-up area with a viaduct

CHEN Tong; LUO Yinping; CHEN Jincai; LIU Yonghong

doi:10.13471/j.cnki.acta.snus.2021B052

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Numerical simulation of traffic-related particle dispersion in a real built-up area with a viaduct

Research articles | 更新时间：2023-11-01

- Numerical simulation of traffic-related particle dispersion in a real built-up area with a viaduct
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 61, Issue 4, Pages: 119-132(2022)
- 作者机构：
  
  1.中山大学智能工程学院，广东广州 510006
  2.广东省交通环境智能监测与治理工程技术研究中心，广东广州 510275
  3.广东省环境科学研究院，广东广州 510045
  4.广东工业大学土木与交通工程学院，广东广州 510006
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.2021B052
  CLC： X513
- Published：25 July 2022，
  
  Published Online：21 January 2022，
  
  Received：24 May 2021，
  
  Accepted：25 June 2021
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陈同,罗银萍,陈进财等.含高架桥的实际街区交通颗粒物扩散模拟[J].中山大学学报(自然科学版),2022,61(04):119-132.

CHEN Tong,LUO Yinping,CHEN Jincai,et al.Numerical simulation of traffic-related particle dispersion in a real built-up area with a viaduct[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(04):119-132.
陈同,罗银萍,陈进财等.含高架桥的实际街区交通颗粒物扩散模拟[J].中山大学学报(自然科学版),2022,61(04):119-132. DOI： 10.13471/j.cnki.acta.snus.2021B052.

CHEN Tong,LUO Yinping,CHEN Jincai,et al.Numerical simulation of traffic-related particle dispersion in a real built-up area with a viaduct[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(04):119-132. DOI： 10.13471/j.cnki.acta.snus.2021B052.

摘要

结合实地观测实验，构建了包含高架桥的实际街区颗粒物扩散沉积模型，研究不同时段的交通颗粒物扩散，并分析来流风向变化时的街区流场和颗粒物分布特征以及高架桥设置的影响。研究发现：（1）弯道阻碍来流风进入街谷中段，是造成街谷在平行风下仍存在严重污染的主要原因；（2）东南方向建筑稀少的十字交叉口设置迫使东侧风进入北侧及西侧街谷内，北侧街谷的颗粒物仅分布在道路中间，极大减少了两侧居民的污染暴露；（3）街区局部位置（如弯道和交叉口）流场及颗粒物分布对来流风向小幅变化的响应极为敏感；（4）高街谷建筑形状因子下，垂直风时高架排放源使两侧建筑上部的颗粒物浓度出现明显突增或保持高浓度水平，最高可达行人呼吸高度处颗粒物浓度的84%，较平行风下同位置浓度高出一个量级；（5）高架桥对实际街区不同街谷流场和颗粒物分布的影响存在差异。垂直入流时，下阶梯型街谷内涡流中心抬升至高架桥上部，颗粒物聚集在背风侧建筑物上；而上阶梯型街谷内涡流中心被压至高架桥底部，颗粒物堆积在高架桥下方。

Abstract

Based on the data from field observations， a numerical model of particle diffusion and deposition in a real built-up area with viaduct was constructed. The traffic-related particle dispersion during different time periods was studied. The characteristics of flow field and pollutant dispersion were analyzed under different wind directions， and the impacts of the viaduct were also discussed. The bend obstructed incoming wind from entering the middle of the street canyon， which was the main cause of serious pollution in the street canyon in parallel windward. The intersection with fewer buildings on the southeast forced the east wind to enter the north and west side street canyon. Particles in the north side street canyon were only distributed in the middle of the road， greatly reducing the pollution exposure of residents on both sides. The flow field and particle distribution at local locations （such as bends and intersections） were sensitive to small changes in incoming wind direction. Under the high street shape factor， the particle concentrations near the upper part of buildings on both sides increased sharply or maintained a high level， which was up to 84% of the pedestrian breathing height and an order of magnitude higher than that in the same position under parallel wind. The impacts of viaduct settings on the flow field and particle distributions in different street canyons were different. When vertical inflow occurred， the vortex center in lower stepped street canyon was above the viaduct， and particles gathered on the leeward side building； the vortex center in upper stepped street canyon was at the bottom of the viaduct， and particles accumulated under the viaduct.

关键词

城市街区高架桥颗粒物扩散模拟

Keywords

urban built-up areaviaductparticlesdispersion modeling

references

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