Abstract
A two-dimensional steady state hydrodynamic dispersion model is used, with the fresh-salt water interface model, to investigate the motion of the coastal confined groundwater in the presence of various pumping patterns. Two expressions of the dispersion coefficient are considered; one is constant over the entire region of the aquifer, and the other is dependent on the flow velocity of the groundwater. The main results are as follows : 1) As the groundwater is pumped more inland, salt water intrudes more inland, whereas the pumping in the lower layer of the aquifer near the coast is effective to prevent the seawater intrusion; 2) in the upper layer pumping, the fresh-salt water interface model serves as a convenient method for approximate analyses and predictions of seawater intrusion into the coastal confined aquifers.
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