Three-dimensional numerical simulation of density-dependent groundwater flow and salt transport due to groundwater pumping in a heterogeneous and true anisotropic coastal aquifer system

摘要

A series of three-dimensional numerical simulations using a multidimensional hydrodynamic dispersion numerical model is performed to analyse seawater intrusion under groundwater pumping in an unsaturated fractured porous coastal aquifer system, which is heterogeneous and true anisotropic. The numerical simulation results show that such heterogeneity and true anisotropy have significant effects on spatial and temporal distributions of density-dependent groundwater flow and salt transport. Therefore, it may be concluded that both heterogeneity and true anisotropy must be properly considered when more rigorous and reasonable predictions of long-term density-dependent groundwater flow and salt transport induced by groundwater pumping are to be obtained for the optimal management of coastal groundwater resources.