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Developing a new air pollution dispersion model with chemical reactions based on multiple cell approach

机译:基于多细胞方法的化学反应开发新的空气污染分散模型

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A two dimensional atmospheric dispersion model for computation of the ambient air concentration of reactive pollutants emitted from ground level sources is described. Atmospheric chemical reactions are the most complicated and stiff part of pollutants dispersion equations. Coupling them with other physical transport processes to assemble an integrated dispersion model is a time consuming and complicated matter. Mechanism of reactions can be present in form of ordinary differential equations (ODEs). Different pollutants, however, may present different variability characteristic due to their specific emission patterns, rates of diffusion, and transport and transformation behaviors like atmospheric reactions. In this article, reaction term was combined with other parts of dispersion model by using a mathematical technique. The program can simulate ground level emission sources and only needs meteorological data and emission source parameters. The outputs from the MATLAB program are presented in graphical form. The program was designed to be user friendly and computationally efficient through the use of variable pollution grids, factorized operations, and memory pre-allocation. Model estimation results show that, pollutant concentration is determined as a function of distance downwind and distant from the surface. Conservation of mass equations for an array of cells or nodes are solved simultaneously by an implicit finite difference method for different representative atmospheric conditions.
机译:描述了一种用于计算从地面源发射的反应性污染物的环境空气浓度的两维大气分散模型。大气化学反应是污染物分散方程的最复杂和僵硬的一部分。将它们与其他物理传输过程耦合以组装集成分散模型是耗时和复杂的事物。反应机制可以以常微分方程(ODES)的形式存在。然而,不同的污染物可能由于其特定的排放模式,扩散率和运输和转化行为而存在不同的可变性特征,以及与大气反应的转化行为。在本文中,通过使用数学技术将反应项与分散模型的其他部分组合。该程序可以模拟地面级发射源,只需要气象数据和发射源参数。来自MATLAB程序的输出以图形形式呈现。该程序旨在通过使用可变污染网格,分解操作和内存预配置来实现用户友好和计算上高效。模型估计结果表明,污染物浓度被确定为距离距离的距离和远离表面的函数。通过针对不同代表性大气条件的隐含有限差分方法同时求解用于细胞或节点阵列的质量方程的守恒。

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