大风天气对大气环境污染物扩散的影响建模研究

Study on Influence of Gale Weather on Atmospheric Pollutants Through Modeling

为了确定大风天气对污染物扩散造成的影响,提出大风天气对大气环境污染物扩散的影响建模。提取大风天气风向、表面压力、表面风速、平均风速廓线、湍流五种影响大气环境污染物扩散因素;采用Fick定律和湍流扩散理论建立大气环境污染物迁移、转化基本方程,求取污染物在不同方向上的浓度,实现大风天气对大气环境污染物扩散影响的确定。实验表明在同一污染物浓度检测时间频次下,PM_(2.5)质量浓度随着大风天气风向的变化而变化;随着风速的增加,PM_(2.5)质量浓度顺着风来源的方向向四周扩散;模型分析结果与风对大气环境污染物扩散影响理论基本一致。

In order to determine the impact of gale weather on pollutant diffusion,a modeling study on the impact of gale weather on pollutant diffusion in atmospheric environment is proposed.Five factors affecting the diffusion of atmospheric environmental pollutants are extracted:wind direction,surface pressure,surface wind speed,average wind speed profile and turbulence.Fick's Law and turbulent diffusion theory are used to establish the basic equation for the migration and transformation of atmospheric environmental pollutants,to calculate the concentration of pollutants in different directions,and to realize the determination of the impact of windy weather on the diffusion of atmospheric pollutants.The results show that under the same pollutant concentration detection time and frequency,the mass concentration of PM_(2.5) changes with the change of wind direction.With the increase of wind speed,PM_(2.5) mass concentration diffuses around along the direction of wind source.The model analysis results are consistent with the theory of the influence of wind on the diffusion of atmospheric pollutants.