Abstract
For the large-scale 2D and quasi-3D groundwater flow numerical simulation based on FEM, spatial discretization scale has significant influence on the result of simulation. A large element size may result in inappropriate local water balance, and then lead to spurious oscillation. Although Zhang et al.(2001) showed the criterion on “time step” to avoid the spurious oscillation for the fully implicit quasi-3D groundwater flow finite element scheme, the criterion of “spatial scale” against spurious oscillation in quasi-3D groundwater flow finite element solution has not been given. In this paper, the criteria to select spatial scale L for the 2D and quasi-3D groundwater finite element schemes are derived based on Zhang et al.(2001), and the effects of spatial scale on spurious oscillation solutions in the finite element solutions of 2D and quasi-3D groundwater flow models are discussed using two examples.
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