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Open File Report 171

Forward modelling airborne electromagnetic data for the Riverland, South Australia

Green A, Munday T


The report is a CRCLEME contribution to the South Australian Salinity Mapping and
Monitoring Project (SA-SMMSP) being conducted under the auspices of the National Action Plan for Salinity and Water Quality. It summarises some scoping work undertaken ahead of the call for tenders that concerned the acquisition of airborne geophysical data, and represented an effort to be more considered in their application to natural resource management issues.

Following discussion with South Australian colleagues, concerning issues of relevance to salinity management in the Riverland region of South Australia, we established a scoping study to determine whether the Blanchetown Clay might be a resolvable target for current airborne electromagnetic systems, and if so what system might be most appropriate for its detection. Of particular interest was whether recent advances in EM system technology, improvements in their noise characteristics and data processing and display would enable the reliable mapping of these clay units including their thickness. For modelling purposes, a representative geological model was defined for the Blanchetown Clay along with a corresponding schematic geo-electric model.

This report captures the outcomes of a set of milestone reports submitted to the SA Technical Advisory Committee as part of early scoping studies conducted by CRCLEME on behalf of the SA-SMMSP.

This work indicated that high resolution frequency domain helicopter EM data rather than fixed-wing time domain EM systems were most suited to the detection of the clay at a resolution appropriate for planning purposes

T.J. Munday
Riverland SA-SMMSP Sub-Project Leader


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