In coastal areas salinity of groundwater may pose problems for the sustainable exploitation of fresh groundwater. Groundwater flow modelling is the adequate tool to produce valid predictions of future development in the groundwater system. In order to set up the groundwater models it is essential to have a comprehensive understanding of the geological subsurface. How geophysical methods can contribute to the geological understanding is shown for the model area Elbe-Weser estuaries at the German North Sea coast. Techniques used are electromagnetic soundings (airborne and ground-based), magnetic resonance soundings and 2-D electrical resistivity tomography.


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