基于高斯模式的天津机动车尾气扩散模拟研究

Study on vehicle exhaust gas simulation in Tianjin based on Gauss model

以高斯模式作为理论基础,建立天津市机动车尾气扩散模型,并利用气象条件进行修正.选取天津市2016年12月22日作为研究时间,天津市东丽区某路线作为研究区域对车外PM2.5、O3和CO进行数值模拟,并将模拟结果与实测值进行对比分析.结果表明,经模型模拟得到的PM2.5、O3和CO质量浓度模拟值与实测值起伏变化趋势基本一致,经过统计学分析后PM2.5的模拟值和实测值相关系数可达0.87,O3的模拟值和实测值相关系数可达0.41,CO的模拟值和实测值相关系数可达0.7,说明建立的该模型对于天津市的车外空气质量模拟效果较好,模型具有可适性.

Using Gauss model as the theoretical basis to establish the vehicle exhaust gas model of Tianjin and correct by meteorological conditions. This paper selected December 22 in 2016 as study time and selected Dongli district as study area tobe simulated of PM2.5 , 03 and CO, and the simulation values would be compared with the measured values. The results showed the simulated values of PM2.5 , O3 and CO were basically consistent with the meas- ured values. And after the statistical analysis, the correlation coefficient between the simula- ted and measured values of PM2.5 could reach 0.87, the correlation coefficient between simu- lated and measured values of 03 just reach 0.41, the correlation coefficient between simula- ted and measured values of CO could reach 0.7. The results showed that the model was bet- ter for the vehicle exhaust gas simulation of Tianjin, and the model was also applicable.