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为探寻不同绿地分布形态对城市热环境的改善效果及差异,结合遥感技术和CFD(Computational Fluid Dynamics)数值模拟方法,对城市中五类常见的绿地布局形式的温度场进行数值模拟。利用遥感影像以及LIDAR数据建立三维模型,并通过实地测量温度值对ENVI-met软件模拟结果的真实性做了检验,得到在不同高度上不同绿地分布形态的温度场模拟结果。实验结果表明:将CFD技术引入城市热环境研究这一思路是可行的,根据典型绿地分布形态的热环境模拟分析,不同分布形态在不同高度上具有不同的降温效果。地表处点状分布效果最好,2 m处楔状分布效果最好,而在10m左右的高空条带状的降温效果最好。
In order to explore the effect and difference of different green space distribution on the urban thermal environment, the temperature fields of five kinds of common green space layouts in cities were numerically simulated with remote sensing technology and CFD (Computational Fluid Dynamics) numerical simulation method. The remote sensing image and LIDAR data are used to establish the three-dimensional model. The real-time simulation results of ENVI-met software are tested by measuring the temperature in the field. The simulation results of the temperature distribution of different green space distributions at different heights are obtained. The experimental results show that it is feasible to introduce CFD technology into the research of urban thermal environment. According to the simulation of thermal environment of typical green space distribution, different distribution patterns have different cooling effects at different heights. The distribution of spots on the surface is best, with the wedge distribution at 2 m being the best, while the cooling effect at the height of 10 m is the best.