Abstract
The main task in studying saline intrusion into an aquifer is to determine the position of the saline water-freshwater interface. For a confined aquifer this position is determined mainly by the roof length of the aquifer extending under the sea. This information can be obtained from fluctuations of the groundwater level caused by tidal fluctuations of the sea. In this paper, a mathematical model of confined groundwater-level fluctuations is constructed on the condition that the roof length is finite. Taking account of the continuity of flow between the inland and offshore aquifers allows a general formula to be calculated for the groundwater-level fluctuations in terms of the tidal fluctuations and the length of the confined aquifer under the sea. The actual roof length can be computed by comparison of the observed groundwater-level fluctuations with those computed by the formula under various assumptions concerning the roof length. The method is applied to an aquifer on the Beihai Peninsula, in the Guangxi province of China.
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