摘要：According to the actual situation oflandfill site. it is assuming a three-layered system of compacted clay liner, unsaturated aquifer underlain the landfill and one-dimensional governing equations for leach-ate transport in each layer of three-layered system are established. The governing equation are solved by numerical methods, which taken into account the effects of equilibrium nonlinear sorption of com-pacted clay liner and nonlinear sorption of unsatu-rated soil. The numerical simulation are carried out by varied the parameters, and the results show that the nonlinear sorption of unsaturated soil is more sensitive to pollutant transport than nonlinear sorp-tion in compacted clay liner, and it became the con-trolling factor of pollutant transport in unsaturated soil. The nonlinear sorption parameter beffects on the pollutant transport are more obviously than the nonlinear sorption parameter Sml. In the meantime, degree of saturation of unsaturated soil is the con-trolling factor of pollutant transport.
关键词：Unsaturated soil;volumetric water content;degree of sat-urationLandfill;compacted clay liner
