非饱和分层土壤中污染物迁移转化规律研究

分析了污染物在分层土壤中随下渗水体向下迁移的机理过程，借助于数值计算模型模拟计算非饱和分层土壤中污染物迁移转化特性，研究了不同土壤层及土壤层的排序对污染物迁移转化的影响状况。

Contaminant Transport and Transformation in Unsaturated Water Flow in Multilayered Soils

On the basis of the finite difference approximation to the water and concentration equation.A numerical model is developed to predict water and contaminant transport through water unsaturated,multilayered soils.Calculated results are presented for two and three layered soils during water infiltration and redistribution.Linear equilibrium adsorption and first order kinetic reaction are used to describe contaminant adsorption in individual soil layers.It has been found that for all adsorption mechanisms considered concentration distribution during infiltration and redistribution is significantly influenced by the order in which the soil layers are stratified.