广州市全城交通污染宏观仿真模拟研究

Macroscopic Numerical-simulation of Urban Traffic Pollution in Guangzhou Urban Area

采用城市交通污染宏观高分辨率三维仿真模型,对广州市的主要道路路网的交通污染进行了数值模拟。讨论了路网线源强度的计算方法,并给出了广州市21.6 km×13.6 km范围内100多条道路的路网分布。为了能精细的反映污染物的分布扩散情况,采取Δx=Δy=50 m,Δz=20 m的高分辩率网格步长,使计算网格步长与主要道路的宽度具有同样的数量级。两个试算算例的结果表明,本文的城市交通污染宏观高分辨率三维仿真模型具有良好的可行性,进一步的研究将为研究和减低城市交通污染提供定性和定量的依据。

Traffic pollution in Guangzhou was numerically analyzed by using three-dimensional numerical-simulation model with high resolution and the computation methodology of linear-source strengthen was discussed. The distribution of more than 100 roads was identified in the range of the whole Guangzhou city. High-resolution grid spacing of △ x = △ y = 50 and △z = 20 meters was applied for reflecting the distribution and diffusion of vehicle emission pollutants precisely. Accordingly, computational grid spacing was provided with identical scalar with main roads width. The results of two tentative calculation examples show that three-dimensional nmnerical-simulation model with high resolution for traffic pollution is practicable. The simulative results will give the qualitative and quantitative instructions for investigating and contmlling urban traffic oollution.