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This paper describes the application of finite element method to the analysis of the interface problem in coastal groundwater flow.Firstly are introduced the principle of finite element method in the analysis of groundwater flow and its application to the two-dimensional interface problem in steady groundwater flow, especially on the shape of interface and the position of seepage-out point. Secondly are shown three examples of the finite element analysis.One of them is an interface problem in coastal groundwater flow without drain, then the numerical solution is compared with the theoretical one for the purpose of confirming the accuracy of the numerical method. The second one is the problem with a sink or a source, which is well-known as an upconing phenomenon. The last one is the intrusion of salt water into a coastal unconfined aquifer.

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