高架污染源的最大地面浓度及位置  

Maximum ground concentration and its location formed by an elevated pollution source

作　　者：李玉平[1] 

机构地区：[1]北京理工大学化工与环境学院,北京100081

出　　处：《安全与环境学报》2010年第6期89-91,共3页Journal of Safety and Environment

摘　　要：为预测高架污染源排放的污染物在地面上形成的最大浓度及其位置,根据高斯方程和由Turner的数据拟合的经验公式,导出了计算公式并给出了其解法。结果表明,出现最大浓度的位置随有效源高的增高和大气稳定性的增大而远离污染源;最大地面浓度随有效源高的增高而降低。在有效源高较低时,大气稳定度对地面最大浓度的影响不明显,当有效源高大于55 m时,最大地面浓度随大气稳定性的增大而降低。Gaussian plume models are widely used for elevated point sources. According to the Gaussian plume models, there is a maximum ground concentration downwind of the elevated point sources. This concentration and its location are very important to the atmospheric environmental impact assessment. To predict the maximum ground concentration and its location formed by an elevated pollution source, the derivatives of dispersion coefficients respect to x are required. But the dispersion coefficients used now is a set of discrete data, cannot obtain the accurate and continuous derivatives, so there is only an approximative formula for the C stability. In order to calculate accurately the maximum ground concentration and its location for all stability categories, basic equations and solution method were given according to Gaussian plume equation and a set of experiential equations about the dispersion coefficients. The results show that the location of maximum ground concentration goes far from the source with the effective stack height ; if the effective stack height is very low （for example, lower than 2 m）, the location of maximum concentration is very close to the source, there is no maximum concentration for some stability categories, the elevated source is similar to the surface source ; if the effective stack height is very high, the location of maximum concentration is very far to the source so that it far than the calculation range in this paper. The location of maximum ground concentration goes far from the source with the atmosphere stability. The maximum ground concentration decreases with the effective stack height. The maximum concentration decreases fast when the effective height is less than 40 m, and slower if the effective height of the stack is higher than 40 m. The atmosphere stability has less influence on the maximum ground concentration if the effective stack height is less than 55 m, but if the effective stack height is higher than 55 m, the maximum ground concentration decreases with the atmosph

关 键 词：环境科学技术基础学科 高架污染源 最大地面浓度 高斯扩散方程 

分 类 号：X820[环境科学与工程—环境工程]