Simulation Research Of Dioxin Emitted By Point Sources In A Mountainous Area In Chongqing Based On Three Air Quality Models

AERMOD,ADMS and CALPUFF are used to simulate the environmental impacts of dioxin from medical waste and domestic waste incineration projects in a mountainous area in Chongqing.Through the comparison with the monitoring data of dioxin soil deposition,the simulation deposition effects of the three models are evaluated and the dominant model is selected.At the same time,the differences of the simulated high-altitude meteorological data from different sources are investigated.Then in order to analyze the influence of the simulated high-altitude meteorological data from different sources on the simulation results,the above data are input into the superior model obtained in the previous study,and the paper also uses the monitoring data of dioxin soil deposition to judge the application of the above data.The results show that:(1)The research site is located in the area with complex terrain,small ground wind speed and variable ground wind directions.In terms of magnitude,the ground concentration in the area and the deposition at the monitoring points of dioxin simulated by CALPUFF are the smallest;the ground concentrations in the area simulated by ADMS and AERMOD are somewhat different,and the depositions at the monitoring points simulated by ADMS and AERMOD are relatively close.In terms of the ground concentration distribution in the area and the deposition distribution at the monitoring points,the distribution results of CALPUFF show great differences with the results of the other two models,while the distribution results of ADMS and AERMOD are similar.CALPUFF has the best performance in the correlation between the simulated deposition and the monitoring data of dioxin soil deposition,with a correlation coefficient of 0.83,and can be used as an advantageous model for simulating dioxin deposition distribution under complex terrain-meteorology conditions.(2)In the case of relatively close distance,for the same meteorological element,the characteristics of the simulated profiles at the different locations from the same initial source data are basically the same;at most altitudes,the correlations between the simulation results at the different locations obtained from the same source for each meteorological element are better.(3)CALPUFF is used as the dominant model.The ground concentrations in the area and the depositions at the monitoring points of dioxin simulated by CALPUFF using the highaltitude meteorological data from two different sources(obtained by using NCEP-FNL(NCEP: National Centers for Environmental Prediction,FNL: Final Operational Global Analysis)data and LAPS-STMAS(LAPS: Local Analysis and Prediction System,STMAS: Space Time Multiscale Analysis System)data to drive WRF(Weather Research and Forecasting))are not obvious,indicating that the effects of the high-altitude meteorological data from different sources on both are little.However,with the increase of altitude,the differences in the simulated dioxin concentrations using the high-altitude meteorological data from different sources are more and more.When verifying the effects of two kinds of data with the correlations between the monitoring data of dioxin soil deposition and the simulated deposition,it is found that the correlation coefficient(0.78)using LAPS-STMAS data is slightly larger than the correlation coefficient(0.76)using NCEP-FNL data,and that is to say the data can be substituted for each other when simulating the distribution of dioxin soil deposition.