基于冬季PM2.5扩散规律的居住组团内部 公共空间优化--以成都市颐和家园、三千里、虹波苑三组团为例

Optimization of Public Space Planning in Neighborhoods Based on Winter PM2.5 Diffusion Law:Taking Three Neighborhoods of Chengdu Yihejiayuan,Sanqianli and Hongboyuan as Examples

随着人口聚集和城市化进程的推进,城市尤其是特大城市中PM2.5对人体的危害受到普遍关注。文章以成都市2014~2017年冬季的PM2.5统计数据为基础,综合比对PM2.5在各季节、市内各区域浓度值分布的差异和规律,以成都市3个典型组团为例,根据组团现状和相关技术指标建立几何参数模型,借助ANSYS软件模拟案例组团内公共空间的风场分布,分析组团内公共空间PM2.5的扩散环境,结合PM2.5的扩散规律,预测组团内公共空间PM2.5浓度值分布状态,并通过现场数据实测验证模拟结果的灵敏度和准确性。在此基础上,文章从公共服务设施规划、园林景观和立体空间等方面初步提出了居住组团内公共空间规划优化的建议。

With the growth of population aggregation and the acceleration of urbanization,the harm of PM2.5 to human bodies in cities,especially megacities,has received widespread attention.Based on the winter PM2.5 statistics of Chengdu in 2014-2017,this paper comprehensively compares the differences and laws of the distribution of PM2.5 in each season and each region.Taking Yihejayuan,Sanqianli and Hongboyuan as examples,according to the spatial layout of neighborhoods and the related technical indicators,the geometric parameter model is established.And then the ANSYS software is used to simulate the distribution of the public space wind field in the neighborhoods,and the diffusion of the public space PM2.5 in the group is analyzed.Finally,combined with the PM2.5 diffusion law,predicts the difference of PM2.5 concentration distribution in different areas of the public space within the neighborhood,and verifies the sensitivity and accuracy of the simulation results through field data measurement.On this basis,the article puts forward suggestions on the optimization of public space planning in residential clusters from the aspects of public service facility planning,garden landscape and three-dimensional space.