An integrated geophysical study, including high-resolution reflection seismies and TDEM, was recently carried out at several sites along the Mediterranean coast of Israel (Fig. 1). The coastal aquifer consists of the Quatemary sequence of marine and continental deposits composed predominantly of calcareous sandstone (the Kurkar unit) and including a number of clay layers. Calcareous sandstones are generally porous and hydrologically conductive and considered aquifers, whereas clays are impermeable and act as aquicludes. In the places where the clays are thick and extensive enough, they divide the aquifer into distinct subunits. Fig. 2 represents lithologicallog from borehole 12/A in which various Kurkar units are designated as KAl through KA7. The sequence rests on impermeable black shales and clays of the Saqiye group of Pliocene - Miocene age. The aquifer suffers from severe salinization caused by seawater encroachment reaching as far as 1 km from the sea shore. The general objective of the geophysical survey was a detailed study of the coastal aquifer and, in particular, subdivision of the aquifer into subaquifers separated by impermeable units and evaluation of water quality within each subaquifer. At first stage, the survey was carried out at the Nitzanim site, where several observational wells were located and used for correlation purposes. Then the survey was continued to other areas where the hydrogeological control was limited by a single well at each site. The results of the survey are represented here by an example of the Nitzanim area.


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