Abstract
A joint radiomagnetotelluric (RMT) and transient electromagnetic (TEM) survey was carried out on a profile over an old waste deposit in Cologne to map lateral and vertical boundaries as well as inhomogeneities within the deposit itself. For the RMT method, three pairs of frequencies between 16.4 and 198 kHz, from radio transmitters located in roughly perpendicular directions, were used. The observed apparent resistivity ( ϱ a) and phase (φ) data clearly show the lateral boundary of the deposit to be characterized by strongly decreasing ϱ a values for all frequencies. The penetration depth for the lowest frequency is about 25 m outside and only 12 m inside the deposit. The RMT data were interpreted by one- and two-dimensional inversion techniques. On the waste site there is a resistive overburden over the highly conductive waste. Inhomogeneities within the deposit could also be resolved. However, the bottom of the deposit could not be detected by the RMT method because of the low penetration depths observed over the highly conductive waste site. TEM measurements on the same profile, however, allowed to achieve exploration depths between 10 and 100 m. Interpretation using one-dimensional conductivity models indicates the lower boundary of the waste site (20 m) and completes the two-dimensional conductivity depth section of the waste deposit.
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