潮汐による海岸被圧地下水の流動
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概要
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The piezometric head in artesian groundwater oscillates remarkably due to oceanic tide. As is well known, the effect of the tide on the piezometric head prevails even in far inland. The artesian groundwater is generally a very good source of drinking water, because of the purification properties of the soils; it is also used for irrigation, and, where surface water is scarce, for industrial purposes. A large quantity of discharge from an aquifer produces a reduction in water pressure and therefore, at the same time, an increase in the effective stress in the soil skeleton of the porous medium. The latter produces land subsidence (or consolidation) and sea water may infiltrate into artesian groundwater. It is necessary to study the characteristics of the littoral artesian groundwater flow for preventing these groundwater pollution. In this paper we will solve the differential equation for unsteady artesian groundwater flow under various boundary conditions that correspond to the geological structure in the littoral zone.
- 長崎大学工学部の論文
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