特种污染物排放源强反演及可视化分析工具研发及Hg^2＋分析示例

Development of a GIS-based visualization tool for inverse computation of pollutant emission rates and a pilot study case of Hg^(2+)

研发了特种污染物排放源强反演及可视化分析工具,集成利用了WRF气象预报结果及HYSPLIT前向轨迹规划外场监测点,调用CALPUFF模型基于监测数据和对应气象条件快速反算源强并模拟得到排放影响范围,并使用开源GIS平台进行可视化分析.同时,选取大气背景浓度极低的活性气态汞(Hg^(2+))为目标,以李坑垃圾焚烧厂不稳定Hg^(2+)排放为监测主体.结果表明,基于下风向监测数据反演的源强与实测的烟气Hg^(2+)含量有着较好的一致性(R^2=0.801).该工具可作为特种大气污染事故应急辅助决策新手段,提供包含非稳态排放源强、污染扩散影响范围等信息在内的关键依据.

An innovative GIS-Based visualization tool for inverse computation of pollutant emission rates is developed in this study. Using endpoint data obtained by the HYSPLIT forward trajectory model and the air dispersion data obtained by the CALPUFF model both driven by WRF meteorological forecast data,the GIS-based tool can visualize and inversely calculate the pollutant emission rates from stacks. To demonstrate the effectiveness of thistool,emissions of Hg^2＋from Likeng waste incineration plant in Guangzhou,China was used as a test case since the background concentration of Hg^2＋is extremely low in air. The case study results show that the estimated emission concentrations of Hg^2＋are consistently agreeable with the on-site monitoring data in the stack plume（ R^2= 0.801）. This tool provides a new modeling method with key information（ e. g. pollutant emission rate and air dispersion area） for decision support of emergent pollutant emission control.