Abstract

Saltwater intrusion in a three-dimensional large-scale coastal aquifer in the northern part of the province Noord-Holland, The Netherlands, is investigated. The computer code MOCDENS3D, which is the code MOC3D of Konikow et al. (1996) but adapted for differences in density, is used to model the displacement of fresh, brackish and saline ground-water in this hydrogeologic system. It appears that a severe salinisation already occurs. This process is initiated by the reclamation of the (low-lying) polders during the past centuries. Though seepage quantities decreases in many polder araes due to an increase in salinity, the salt load increases significantly.

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