The upward surge of saltwater due to a high extraction rate of water plants, tectonic weakness zones or eroded clay layers threatens the fresh water supply in some regions of northern Europe. For monitoring the movement of salt water, the usage of borehole measurements is insufficient as only point information can be retrieved. Our aim is to develop a monitoring system that uses boreholes as electrodes (Long Electrode Electrical Resistivity Tomography - LEERT) in conjunction with surface-electrodes. As a first step we conducted synthetic modelling using the Finite Element Method and the Complete Electrode Model in order to obtain a better insight on the influence of long electrodes ERT measurements. Sensitivity and resolution measures show a reasonable capability of imaging saltwater intrusions if surface electrodes are used in combination with boreholes.


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