THE NUMERICAL SIMULATION OF SOLUTE TRANSFER IN SATURATED AND UNSATURATED SOIL
饱和非饱和土壤中溶质运移的数值模拟

In the present paper, numerical simulation of solute transfer in saturated and unsaturated soil is given. The convection and dispersion terms in the equations governing water and salt motion are solved respectively by using Langrangean moving coordinate and Eulerian fixed coordinate systems. Furthermore, cubic spline interpolation method is employed for the projection from the fixed coordinate to the moving coordinate, which makes the model more exact and simpler. The comparisons with theoretical solution in a specific case and experimental results of a soil column in laboratory verify the correctness and reliability of the model. Finally, this model is used for analysis of fresh water leaching. The numerical computation indicates that using shallow mass wells for pumping and draining, the effect of fresh water leaching for saline land reclamation can be greatly enhanced.