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本文分析了污染物在地下水系统中迁移转化规律,建立了变系数动力迁移模型,讨论了对流一扩散方程中动力弥散系数随时间的变化规律,推求出变系数迁移方程的解析解。运用土壤柱物理模型试验的实测资料进行验证比较,结果表明,变系数动力迁移模型的计算值与实测值吻合良好,得到了变系数与常系数动力迁移模型的适用范围。
In this paper, the migration and transformation rules of pollutants in groundwater system are analyzed. The variable coefficient dynamic migration model is established, and the dynamic dispersion coefficient of convection-diffusion equation with time is discussed. The analytical solution of variable coefficient migration equation is deduced. The experimental data of the physical model test of soil column are compared and verified. The results show that the calculated value of the variable coefficient dynamic migration model is in good agreement with the measured data, and the applicable range of variable coefficient and constant coefficient dynamic migration model is obtained.