利用数值模式和示踪试验确定某厂址地区大气扩散参数北大核心CSCD

利用WRF数值模式和CALPUFF扩散模式相结合的技术手段分析研究某沿海厂址大气扩散参数,并通过现场示踪试验验证了数值模式模拟结果的可靠性和模拟方法的适用性。结果表明,CALPUFF扩散模式无论从扩散因子数量值还是分布范围上,与现场示踪试验结果均能保持较好的一致性,CALPUFF扩散模拟结果能较好地反映当地大气扩散实际特征。通过与P-G和IAEA扩散参数比对得出,CALPUFF数值模式结果确定的厂址大气扩散参数符合大气扩散特征的一般规律;在考虑厂址实际下垫面和流场特征情况下,CALPUFF数值模式确定的扩散参数整体较P-G扩散参数偏大,其扩散参数值能较真实地反映该地区气载污染物的扩散能力。

Determining the atmospheric diffusion parameters in a site using numerical simulation and tracer test

A Weather Research and Forecasting Model(WRF)and atmospheric diffusion model(CALPUFF)have been used to numerically simulate and analyze the atmospheric diffusion parameters in coastal area of a site.Compared with the results of atmospheric tracer test,whether from value range or from distribution of diffusion factor,CALPUFF diffusion model can better reflect the local atmospheric diffusion characteristics.Compared with P-G diffusion parameters,atmospheric diffusion parameters obtained from CALPUFF model are more consistent with the general law of atmospheric diffusion.In consideration of the actual underlying surface and flow field characteristics of the site,the diffusion parameters determined by the CALPUFF numerical model which are larger than the P-G diffusion parameters and smaller than the IAEA diffusion,can more truly reflect the diffusion capacity of pollutants in the area.