Model calculations of groundwater conditions on Sternoe peninsula

The groundwater condition within the bedrock of Sternoe was calculated by the use of a two-dimensional FEM-model. Five sections were laid out over the area. The sections had a depth of five km and length between two and six km. First the piezometric head was calculated in two major tectonic zones where the hydraulic conductivity was set to 10-6 m/s. In the other sections of which two cross the tectonic zones, the bedrock was assumed to have hydraulic conductivities of 10-8 m/s in the uppermost 300 m and 10-11 m/s in the rest. From the maps of the piezometric head obtained, the flow time was calculated for the groundwater from 500 meters depth to a tectonic zone or to the 300 meters level below the sea. This calculation was performed for two sections both with and without tectonic zones. Also the influence of groundwater discharge from a well in one point in one of the tectonic zones was calculated. The kinematic porosity was assumed 10-4. The result showed that the flow time varied between 1000 to 500 000 years within the area with the exception of the nearest 100 m zone to any of the tectonic zones. For further calculations the use of three-dimensional models was proposed. (Auth.)