Buried subglacial valleys are important groundwater reservoirs in Northern Germany. However, relative little is known about their exact locations, their sizes and the internal structure of their sediment fills. Due to the presence of a conductive clay layer at about 40m depth within the Bremerhaven-Cuxhaven valley, no information about the structure below this layer could be obtained by conventional ground TEM, SkyTEM and helicopter electromagnetic measurements. To overcome this problem, the TEM method in the central loop configuration was used with a large transmitter size of 400m by 400m and a high current of 12.7A for early times and 20A for late time measurements. Five soundings could be realized and the data were interpreted by means of OCCAM and Marquardt type 1D inversions. The inversion results were compared with SkyTEM, HEM and seismic sections of the buried valley. A conductive clay layer was found between 30 and 83m within the valley and the bottom of the valley was determined to be at a depth of 285 to 309m


Article metrics loading...

Loading full text...

Full text loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error