Expected results of climate change in the North Sea region are rising groundwater table and sea level rise, both affecting the dynamics of the groundwater systems. In the EU INTERREG North Sea Programme project TOPSOIL consequences of climate change on groundwater and soil are investigated in 16 areas around the North Sea. In two German areas on both sides of the river Elbe groundwater flooding and saltwater intrusions are in the focus of interest. To quantify the enhanced demand for drainage and changes in groundwater salinity, groundwater flow models based on geological models are established. The contribution of geophysical measurements to the geological models is shown.

Area GE-1 in Schleswig-Holstein consists of flat marshland with marine sediments covering the aquifer. Resistivity methods give thickness of the covering layer and the aquifer, borehole NMR gives a first assessment of the hydraulic properties of both layers. Area GE-2 in Niedersachsen consists of moraine areas and marshland. Resistivity formation factor was determined from borehole results, formation factor combined with resistivity logs and HEM data gives the electrical resistivity of the groundwater, which was converted to chloride content. Interpolation of these values gives a map of groundwater salinization in different depths.


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