水及溶质在有大孔隙的土壤中运移的研究(Ⅱ):数值模拟

A study of the transport of water and solute in macroporous soils(Ⅱ): numerical simulation

本文根据CT扫描得到的土壤大孔隙分布、离心机法测得的土壤水分特征曲线以及计算得到的土壤大孔隙和基质的饱和水力传导度和弥散度,采用新的数值方法模拟了水及溴离子在原状土中的运移,分析比较了模拟结果,得到了原状土溴离子在各时刻的运移图,定量分析了大孔隙的存在对水及溶质运移的影响和对地下水造成的污染。

On the basis of the distribution of soil macropores obtained by the CT scanning, the soil water retention curves obtained by the centrifugal machine, the saturated hydraulic conductivity and dispersivity of the soil matrix and macropores obtained by calculation, the transport of water and Br^- in the undisturbed soil was simulated using a proposed method, and the simulated results were compared and analyzed and the figure of Br^- transport in the undisturbed soil at different times were obtained. The influence of the macropores on the movement of water and solute in the soil and the pollution to the groundwater was also quantitatively analyzed.