TWO-DIMENSIONAL NUMERICAL MODEL FOR SOLUTE TRANSPORT IN VARIABLY SATURATED POROUS MEDIA

抄録

A numerical model to simulate movement of water as well as nonconservative solutes in variably saturated soils is developed based on a Eulerian-Lagrangian method for the transport equation and a finite-difference method coupled with the Newton-Raphson linearization method for Richards' equation in the mass-conservative form. A treatment of boundary conditions in each computational step for the transport equation is proposed. Two examples are presented to demonstrate the performance of the proposed model.