Frequency-domain Helicopter-borne EM Survey for Delineation of the 3D Chloride Distribution in Zeeland, the Netherlands
B. Siemon, E. van Baaren, W. Dabekaussen, J. Delsman, M. Karaoulis, P. de Louw, P. Pauw, T. Vermaas, H. Bootsma, A. Steuer, J. Gunnink, G. Oude Essink and U. Meyer
Event name: Second European Airborne Electromagnetics Conference
Session: Airborne EM
Publication date: 03 September 2017
Info: Extended abstract, PDF ( 4.52Mb )
Price: € 20
In the project FRESHEM Zeeland the entire Province of Zeeland in the south-western part of the Netherlands was surveyed using frequency-domain helicopter-borne electromagnetics (FDHEM). The airborne survey of more than 9000 line-km was conducted in 2014-15 by the German Federal Institute for Geosciences and Natural Resources (BGR). Together with the Dutch partners Deltares and TNO, an approach has been developed to translate the FDHEM data into a full 3D mapping of the chloride concentration of an area of about 1800 km². Verification with an independent dataset showed that groundwater salinity can be accurately calculated based on FDHEM measurements and a stochastic lithological model. Using indicator kriging as interpolation method turns out to be suitable to construct a 3D voxel model, revealing high resolution spatial patterns of groundwater salinity.