ABSTRACTNumerical analysis based on the finite‐difference and boundary element methods is used to investigate the impact of the Dupuit‐Forchheimer approximation on results of salt‐water intrusion simulation. It is found that for sinks or sources (drain, ditch) that are small compared to the freshwater‐zone thickness, the use of the Dupuit‐Forchheimer approximation may cause substantial errors. For such cases, a correction method is proposed and
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