Research On The Application Of Gauss Model In Multi-point Atmospheric Diffusion Simulation Of Small And Medium-sized Cities

In recent years,society’s economy and industry have been developing rapidly,In some cities,industrial enterprises are developed at the expense of the environment.The pollution levels of the atmosphere,soil,and water quality in some areas have seriously endangered human health.Among them,air pollution is the most direct and unavoidable in urban development.In the process of air pollution control,it is particularly important to make a scientific evaluation of the quality of the atmosphere In the process of air pollution control,which requires the appropriate selection of atmospheric pollutant diffusion models according to local conditions.Utilize matching atmospheric diffusion models in suitable areas.This can make a reasonable prediction of the diffusion of atmospheric pollutants,and can provide a strong scientific basis for the control of atmospheric pollution.Suihua is a typical small and medium-sized city in Northeast China.Its urban and suburban industrial development zones,most of its large enterprises use coal as the main energy source for industrial production.In winter,a large number of coal-fired and biomass-fired boilers are also distributed in urban areas for heating and hot water supply.And the burning of straw in the suburbs also caused great pollution to the city’s atmospheric environment.Therefore,the application of the pollutant diffusion simulation model to this city has certain theoretical and practical significance for the treatment of air pollution in such cities.In this paper,all coal-fired and biomass boilers in the study area in 2017 were taken as the main emission targets of air pollutants.This object mainly includes industrial boilers and winter heating boilers,and the straw burning source in a certain period is the second emission object of air pollutants.Sulfur dioxide,nitrogen dioxide,and PM2.5,which are produced by burning coal and burning biomass and whose concentration is classified in the Trial Implementation of Air Technical Specifications(AQI),are selected as the diffusion research objects.In this paper,by comparing a large number of atmospheric pollutant diffusion models,supplemented by the characteristics of the study area itself and the amount of computation,And in order to observe the distribution of atmospheric pollutant concentrations in the study area from a macro perspective,try to combine with GIS software to perform regional simulation and analysis of atmospheric pollutant concentrations in the study area.The research proves that:○1 In many simulation calculations of SO2 and NO2,the correlation between the simulated value and the detected value is good,and the correlation coefficient between the simulated value and the monitored value is above 0.78,which proves that the modified gaussian diffusion model can be used to simulate the diffusion of SO2 and NO2 in such cities.○2 The correlation between the simulated value of PM2.5 and the detected value is general,and the correlation coefficient is less than 0.76.The experimental results show that the diffusion simulation of PM2.5 in this type of city is not suitable for the Gaussian diffusion model.○3 In the application process of the Gaussian model,the sensitivity to atmospheric stability is higher than the topographical factors.○4 From the overall point of view,the simulation accuracy of the model is low,and the pollutant concentration distribution trend of the model is roughly the same as the real trend,but the specific data deviation is large.Therefore,the model is more suitable for the application research of the regional pollutant concentration differential distribution and diffusion trend.○5 Suihua City has the highest PM2.5 pollution level and the lowest SO2 pollution level.It is recommended that the city focus on the governance of the atmospheric environment on PM2.5.