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Airborne Electromagnetic and Radiometric Peat Mapping A Case Study from a Bog in Germany
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 25th European Meeting of Environmental and Engineering Geophysics, Sep 2019, Volume 2019, p.1 - 5
Abstract
Knowledge on peat volumes of peatlands is essential to estimate carbon stocks accurately and to facilitate appropriate peatland management. This case study uses helicopter-borne electromagnetic and radiometric data to investigate a bog in Germany. Airborne methods provide an alternative to ground-based methods, which are labour intensive and unfeasible to capture large-scale spatial information.
One of the airborne surveys BGR conducted at the North Sea coast over the past two decades covers the Ahlen-Falkenberger Moor, an Atlantic peat bog (39 km2) investigated by the Geological Survey of Lower Saxony. This enables comparison of airborne and borehole results.
The lateral extent of the bog is derived from low radiometric and elevated surface data. The vertical extent results from smooth resistivity models in combination with a steepest gradient approach as well as from radiometric data. The latter requirs scaling of the relative depth values. Depths derived from electromagnetic data are usable for this scaling due to their similarity to borehole peat depths. The mean difference of the combination of electromagnetic and radiometric depths and the peat depths of about 100 boreholes is very small (-0.08 ± 1.09 m), but may differ significantly (>±2 m) at some points.