均质土中考虑溶质蜕变效应的污染物迁移模型的解析解

摘要

Due to the decay of some organic pollutants solute, a one-dimensional computational model is established to calculate the migration of pollutants in the homogeneous soil. The separation of variables method is used for solving the analytical solution and the corresponding program is made to give the solution. A typical case study is conducted for verification of the presented method. The calculation results keep consistent with the results from classic software GAEA Pollute, which proves the reliability and validity of the proposed method. Through the parameters study, it is found that the decay has an important impact on the calculation results, and the pollutant concentration is drastically reduced with the decrease of the half-life. Diffusion coefficient has a great impact on the calculation results, so an accurate value of the diffusion coefficient is important to improve the prediction accuracy. The analytical solution can be used to predict pollutant migration considering the decay of pollutants , which can provide a reference for the landfill liner design.%针对一些有机污染物溶质具有蜕变的性质,建立了均质土中考虑污染物蜕变的一维迁移模型,采用分离变量法获得了模型的解析解.典型算例计算结果表明,上述模型的计算结果与经典的GAEA Pollute分析软件的计算结果基本一致,说明了该方法的正确性和可靠性.通过对该模型的参数进行讨论分析发现:考虑蜕变效应对计算结果有一定影响;随着污染物半衰期的减小,污染程度急剧降低;扩散系数对计算结果存在较大影响,准确获取该参数对提高预测精度至关重要.提出的解析方法可用于预测具有蜕变性质污染物的迁移规律,从而为相关填埋场垫层设计提供参考.