摘要
评价区域内的气象条件是影响大气环境影响预测结果的重要因子.为寻找可能的最大影响,须设置可能发生的不利于污染物传输与扩散的气象条件.分别以城市和郊区的高、中和低架源为例,计算其在各种风速和稳定度组合情况下的最大地面浓度,利用Screen3模式,寻找各类污染源对环境影响最大时的不利气象条件,以及需关注的环境空气敏感点(区).结果表明:小风速和强不稳定度是城市和郊区2类源的不利气象条件;而城市源的不利气象条件还可能出现在小风速和稳定类的情况下.由于城市高架源影响范围广,评价时更应关注整个评价区域的环境空气敏感点;虽然城市高架源的影响程度比郊区高架源小,但城市低架源的影响程度却大于郊区低架源.
Meteorological data in environmental impact assessment （EIA） region is an important factor affecting the EIA results. Therefore, searching for the worst impact of emission sources is equivalent to the setting the unfavorable meteorology for transport and diffusion of pollutants in modeling. The worst meteorological conditions and sensitive locations in EIA region for emission sources with high, medium and low stacks were obtained by Screen3 calculating of the concentrations at surface level for different wind speeds and stabilities combination, Generally, in EIA, lower wind speed and very unstable condition is the unfavorable meteorology. However, low wind speed and stable condition could also be the unfavorable meteorology for the emission sources in urban area. Since the elevated emission sources affect bigger area, attention should be paid to all possible sensitive locations. The impact of elevated emission sources in urban area has less significant impact than those in rural area. On the contrary, the impact of emission sources with lower stack in urban area has more significant impact than those in rural area.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2007年第5期26-30,共5页
Research of Environmental Sciences
关键词
大气环境影响预测
不利气象条件
环境空气敏感点(区)
atmospheric environmental impact prediction
worst case meteorological conditions
sensitive sites or area
