Environmental cleaning operations in coastal areas by pumping are complicated by the presence of both fresh water and salt water. The density difference makes the flow conditions very complicated to predict especially if the situation is further complicated by highly heterogeneous formations. The present paper gives results from a computer simulation of saltwater movements during pumping in a heterogeneous coastal reservoir. The example problem discussed in the paper is based on data from a polluted area in the north west of Denmark. A chemical plant situated on a small peninsular has caused serious groundwater pollution. Several measures have been taken to contain the pollution including draining and extra pumping.

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