摘要
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。
An analytical model which provides an approximate description of scale-dependent transport is presented. The model is based on the advection-dispersion equation, But with the dispersion coefficient and the porous velocity coefficient dependent on the travel time of the contaminant from a single input source. The time-dependence of the dispersion coefficient and the porous velocity coefficient can be assume any arbitrary functions. Analytical solutions pertaining to a time-varying mass injection in an semi--infinite medium with arbitrary initial distribution of concentration and functional dependence of the dispersion coefficient and the porous velocity coefficient can be easity derived from the model. Results from analytical model of the varying and the constant coefficients were compared with the data from the soil column tests. Predicted resultts are in good agreement with the experimental data.
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
1996年第4期475-484,共10页
Chinese Journal of Hydrodynamics
关键词
地下水
污染物
变系数
迁移模型
动力弥散系数
groundwater, contaminant, varying coefficients, transport model, model test, dispersivity coefficient.
