Abstract
Errors of 1-D interpretation of 3-D Time Domain Electromagnetic (TDEM) data are studied on both theoretical and field examples with regard to the application of seawater intrusion mapping. Synthetic TDEM sounding data for a central loop array were calculated along the profile over a 3-D thin conductive body embedded in a resistive host medium. The results obtained were interpreted using a standard 1-D inversion procedure and the recovered geoelectric parameters were compared with the initial “true” parameters. The main distortions in both the response and recovered parameters were obtained in the region over the edge of a confined conductive body. The distortions manifest themselves in the erroneous values for the thickness and resistivity of the target, as well as in the appearance of fictitious conductive layers nearby. In order to partly overcome this problem, the measurements must be carried out along at least one profile. In such a case, the application of 3-D interpretation can essentially increase the reliability of recovered cross-section parameters. This was confirmed by 3-D interpretation of three field TDEM measurements taken in the Palmahin area.
Published Version
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