镇江市机动车污染物扩散模拟分析

Simulation analysis of vehicle pollutants dispersion in Zhenjiang

以镇江市机动车污染排放实测数据为基础,结合具体的气象特点,采用CALINE4(CaliforniaLine Source Dispersion Model-4)模式模拟了镇江市主要路段CO、NOx的日均和高峰小时浓度分布,从模拟的计算结果可以看出:在不利的气象条件下,市区大部分路段的NOx出现较严重超标;两侧都有建筑物的街道,其污染物浓度要比一侧或者两侧都没有建筑物的道路高2～4倍.实测数据与模拟值的相关性分析结果表明该扩散模式具有可操作性,其应用将为镇江市机动车污染严重性的初步评估以及采取防治措施提供依据.

Based on measuring data of vehicle emission and special geographical and meteorological conditions of Zhenjiang, CO and NOx concentration distributions of daily average and rush hour in the main street were simulated with CALINE4 （California Line Source Dispersion Model -4）. The simulated resuits indicate that NOx concentration will be much higher under worse meteorological conditions. It can also be manifested that vehicle pollutant concentrations in the streets with buildings in both sides are 2 - 4 times higher than that without buildings. The research results will be helpful for evaluating and preventing vehicle emission pollution in Zhenjiang.