施工场所点源扬尘扩散特征模拟分析

Simulating Analysis of Point Source Dust Diffusion Characteristics in Construction Sites

粉尘污染对环境、健康、经济和政治的影响日益增大,为了掌握影响粉尘扩散的主要因素,提出以建筑施工场所扬尘为研究对象,基于高斯模型对施工扬尘扩散的时空变化特征进行模拟,并依据帕斯奎尔分类法对影响扬尘扩散的大气因素进行灵敏度分析。结果表明,当风速或大气稳定性增加1个数量级扬尘扩散速度会提高2~3倍,大气稳定性和风速对建筑施工扬尘的扩散影响较大;同时扬尘点源的位置高度对扬尘扩散也有重要的影响。

Dust pollution is a complex problem of growing interest because of its environmental,health,economic and political impact,in order to grasp the sensitive factor of influencing the dust dispersion,this paper put forward the spatio-temporal variation characteristics of dust diffusion based on Gauss model,which takes the construction site fugitive dust as the research object,and use the sensitivity analysis for atmospheric factors of influencing the fugitive dust dispersion based on Pasqual classification.The results showed that atmospheric stability and wind speed have great effect on dispersion of construction fugitive dust,when the wind speed or atmospheric stability increases by one stage,the dust diffusion rate will increase by 2~3 times.And the position height of dust source also has great impact on the fugitive dust dispersion.