基于元胞自动机的污染物潜水面扩散仿真算法

摘要

After pollutants seeping into the underground water surface from the medium,it will be spread in the saturated zone with underground water runoff.Simulating and evaluating this process dynamically can provide a vis-ual method for groundwater pollution emergency decision.Molecular diffusion and mechanical dispersion process model are coupled with cellular automata to simulate the diffusion of groundwater contamination.The parabolic equation is adopted as the simulation pollution source sink input,coefficient of hydrodynamic dispersion in the two-dimensional plane is deducted through the empirical formula to calculate the pollution diffusion flux for each cell. The method was applied to the intersection of Miyun-Huairou-Shunyi area of Beijing, to simulate the diffusion process of pesticides on the surface of the water table dynamically and get a good visual effect.%污染物由介质进入地下潜水面后,会在饱和带随地下水径流发生扩散.对该过程进行动态模拟与评估,可为地下水污染应急决策提供可视化手段.以元胞自动机为基础,耦合地下水污染扩散的分子扩散和机械弥散过程模型,构建了污染物地下水扩散的元胞自动机规则.采用抛物线方程模拟污染源汇项的输入,在二维平面上通过经验公式推演水动力弥散系数,计算元胞的污染扩散通量.将该方法应用到北京密怀顺地区,动态模拟农药在潜水面的扩散过程,具有较好的可视化效果.