oa Hydrogeophysical mapping with the transient electromagnetic sounding method

The transient electromagnetic sounding method is an effective reconnaissance exploration tool for mapping good conductors like day and salt water. In the Bredebro area in Southem Jutland, Denrnark, the method has been used for mapping an aquifer situated in a Tertiary valley system eroded out in heavy day. The area was previously mapped with gravity measurements and this investigation indicated the presence of a Tertiary valley system. The transient electromagnetic investigation has confmed the location of the Tertiary valley found in the gravity investigation and added more information about the boundaries of the valley system.