A characteristic splitting mixed finite element method for three-dimensional saltwater intrusion problem

A combined method is developed for solving saltwater intrusion problem. A splitting positive definite mixed element method is used to solve the parabolic-type water head equation and a characteristic finite element method is used to solve the convection-diffusion type concentration equation. The convergence of this method is considered and the optimal L-2-norm error estimate is also derived. (C) 2016 All rights reserved.