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The motion of the coastal confined groundwater in the presence of various pumping patterns was investigated by numerical analyses, based on one and two-dimensional , unsteady fresh-salt water interface models. Approximate equations describing the temporal variation of groundwater level and freshsalt water interface were utilized in the numerical computations together with appropriate boundary conditions. The results were as follows : 1) Groundwater level varied very quickly in response to sudden change in pumping amount, whereas the interface varied very slowly ; 2) movement of the interface was faster when the groundwater was pumped in the fresh water region as compared to that in the saline water region ; 3) movement of the interface was faster when retreating toward the sea as compared to when it was advancing inland ; 4) artificial recharge through wells in the fresh water region and the saline water region was effective to retreat the toe of the interface and to decrease the thickness of salt water layer, respectively ; 5) in the two-dimensional model, results similar to those in the one-dimensional model were obtained for movement of the interface in the presence of various pumping patterns ; 6) characteristic features of the two-dimensional model in the presence of areal distribution of pumping points were also found, e. g., the speeds of interface toe movement close to and far from pumping points were considerably different.

The motion of coastal confined groundwater in the presence of various patterns of pumping. I Numerical analysis by fresh-salt water interface model.