中山大学学报自然科学版 ›› 2019, Vol. 58 ›› Issue (1): 30-38.doi: 10.13471/j.cnki.acta.snus.2019.01.004

• 论文 • 上一篇    下一篇

不同气象条件小区通风与污染物扩散模拟

翁佳烽1,2,林满2,3,王宝民2,杭建2,梁晓媛2   

  1. 1.肇庆市气象局,广东 肇庆 526060;
    2.中山大学大气科学学院,广东 广州 510275;
    3.东莞市环境监测中心站,广东 东莞 523000
  • 收稿日期:2017-07-05 出版日期:2019-01-25 发布日期:2019-01-25
  • 通讯作者: 王宝民(1966年生),男;研究方向:大气物理学和大气环境;E-mail: wangbm@mail.sysu.edu.cn

Numerical study of flow field and pollutant dispersion in a community in different weather conditions

WENG Jiafeng1,2, LIN Man2,3, WANG Baoming2, HANG Jian2,LIANG Xiaoyuan2   

  1. 1.Zhaoqing Meteorological Service, Zhaoqing 526000, China; 
    2.School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou 510275, China;
    3.Dongguan Environmental Monitoring Centre, Dongguan 523000, China
  • Received:2017-07-05 Online:2019-01-25 Published:2019-01-25

摘要:

利用三维微尺度气象模拟软件ENVI-met,对广州市海珠区中山大学小区冬夏季水平和垂直流场特征以及污染物扩散情况进行了模拟研究,并通过实地观测CO质量浓度进一步检验了模拟结果。研究表明,ENVI-met适用于模拟街区尺度近地面污染物的分布特征,研究区域内存在角隅大风、气流爬坡滑坡及回流等显著特征,由此造成的污染物在不同区域和高度形成高低质量浓度区。当来流与街道峡谷平行时,在风速辐合区形成污染物高值区;当来流与街道峡谷垂直时,存在2种情况:对于独立建筑物和上风向建筑低于下风向建筑的街道,存在与来流反方向风分量,导致街道背风一侧为污染物高值区;而对于上风向建筑物高于下风向建筑物的街道,低层气流方向相同,街道中东部为高污染区。街谷中垂直扩散效率,上风向建筑物低的路段最好,其次为上风向建筑高的路段,独立建筑物的路段最差。研究结果对于城市小区的规划设计布局具有实际借鉴意义。

关键词: 污染物扩散, 小区通风, ENVI-met, 数值模拟, 街道峡谷

Abstract:

Horizontal and vertical airflow characteristics and pollutant transport & diffusion in a residential area in Haizhu district, Guangzhou, during summer and winter, were simulated by using three-dimensional micro-scale meteorological model ENVI-met based on the distinct meteorological conditions, and then validated with the field observation of CO concentration. The results showed that there existed wind corner flow, climbing airflow and landslide, and backflow in the area, which lead to abnormal concentrations of pollutants at different locations and heights. While incoming flow was parallel to street canyon, a high pollutant area can be observed in the convergence zone of airflows. While incoming flow is perpendicular to street canyon, there exist two situations: airflows in opposite direction of incoming flow were observed in the regions behind independent building or between the lower upwind building and higher downwind building, resulting in highly polluted regions on the leeward side of the street; airflows in the same direction of incoming flow were observed, causing more cumulative pollutants in the mid-east of the street in the regions between the higher upwind building and lower downwind building. The efficiency of vertical diffusion in the street valley was the highest in regions between the lower upwind building and higher downwind building, the second in regions between the higher upwind building and lower downwind building, and the lowest over independent building. The results also showed that ENVI-met model can be used to simulate pollutant dispersion at street scales.

Key words: pollutant dispersion, flow field over community, ENVI-met, numerical model, street canyon

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