CAJ | 학술논문

AERMOD模型是《环境影响评价技术导则—大气环境》中的推荐模式。为了更好地验证颗粒物干沉降作用对该模型预测结果的影响,选取福州市的煤堆场作为面源污染源,对预测范围内所有网格点PM10、TSP最大地面浓度进行预测。结果表明：所有网格点TSP地面浓度考虑干沉降时,约为不考虑干沉降时的0.13;PM10地面浓度考虑干沉降时,约为不考虑干沉降时的0.70,干沉降对TSP的影响大于PM10。同一粒径分布下,密度对颗粒物干沉降的影响较大,密度增加对可吸入颗粒物干沉降的影响大于总悬浮颗粒物,当密度大于3 g.cm-3时,所有网格点PM10与TSP地面浓度比值的平均值接近于0.98,认为粒径大于10μm的颗粒物基本完全沉降。此后,随着密度增加网格点处地面浓度的减小主要由PM10的沉降引起。AERMOD考虑干沉降时,距离污染源中心500 m外的网格点处地面浓度,PM10/TSP〉0.98,大于10μm的粗颗粒几乎完全沉降。
AERMOD모형시《배경영향평개기술도칙—대기배경》중적추천모식。위료경호지험증과립물간침강작용대해모형예측결과적영향,선취복주시적매퇴장작위면원오염원,대예측범위내소유망격점PM10、TSP최대지면농도진행예측。결과표명：소유망격점TSP지면농도고필간침강시,약위불고필간침강시적0.13;PM10지면농도고필간침강시,약위불고필간침강시적0.70,간침강대TSP적영향대우PM10。동일립경분포하,밀도대과립물간침강적영향교대,밀도증가대가흡입과립물간침강적영향대우총현부과립물,당밀도대우3 g.cm-3시,소유망격점PM10여TSP지면농도비치적평균치접근우0.98,인위립경대우10μm적과립물기본완전침강。차후,수착밀도증가망격점처지면농도적감소주요유PM10적침강인기。AERMOD고필간침강시,거리오염원중심500 m외적망격점처지면농도,PM10/TSP〉0.98,대우10μm적조과립궤호완전침강。
The AERMOD is a recommended atmospheric simulation model by"a guideline of environment impact assessment:atmospheric environment".To validate the effect of particulate matter dry deposition on the results of ground concentration predicted by AERMOD model,a coal storage yard in Fuzhou was selected as a non-point source,and the maximum ground concentrations of PM10 and TSP in each grid point within the forecast range were predicted.The results indicate that the ratio of surface TSP concentration with counting dry deposition and without counting dry deposition is 0.13 in all grid points.The same ratio for PM10 is 0.70.The effect of dry deposition is larger on TSP than on PM10.The effect of density on particulate matter dry deposition is significant within the same particle size,while the effect of density increase is larger on dry deposition of inhalable particulate matter than on that of TSP.When the density is higher than 3 g · cm-3,the PM10/TSP ratios of the average ground concentrations are all close to 0.98 in all grid points.The particles diameters larger than 10 μm are almost deposited completely.Thus,the decrease of surface concentration in the grid point is caused by PM10 deposition with the increase of density.The ratio of the surface concentration of PM10 to that of TSP in the grid point 500 m away from the source center is larger than 0.98 when dry deposition is considered in the AERMOD model,and coarse particles larger than 10 μm are almost deposited completely.