饱和-非饱和土壤中溶质的溶解-结晶二相模型初探

目前溶质运移的模型主要采用水动力弥散方程来实现,但水动力弥散方程不能考虑到溶解在地下水中的溶质因为溶解-沉淀作用形成结晶而积聚在土壤中的事实,这部分结晶相溶质不能直接通过水动力弥散作用而随地下水迁移。将土壤中的溶质分解成溶解相溶质和结晶相溶质,试图对溶质在随地下水-土壤水分运动而迁移,并同步沉积、释放的动态变化过程进行定量化的描述,建立起更为合理的地下水中溶质迁移和积聚的动态数学模型。

Crystallization and Resolution Modeling Based on Two-phase Solute Transport in Variably Saturated Soil

The numerical simulation of solute transport is commonly built through convection-dispersion equation,but the equation is feeble in explaining the crystalline phase solute accumulation in soils.In this paper,the crystalline phase solute and dissolved phase solute are both taken into account.By the combination of the dissolution deposition mechanism with the reconstructive convection-dispersion equation,the new dynamic simulation model on solution transport and accumulation in variably saturated groundwater flow has been established.The new dynamic model is used to simulate crystalline phase solute accumulation in soils.It is shown from mass balance analysis and comparison analysis that the calculated results are correct and reasonable.In order to extend the application scale and accuracy of the model,further revision and perfection is required.