Airborne Electromagnetic, Magnetic, and Radiometric Surveys at the German North Sea Coast Applied to Groundwater and Soil Investigations

Remote Sensing

Annika Steuer¹  Bernhard Siemon¹  Malte Ibs-von Seht¹  Helga Wiederhold²  Nico Deus³ 

[1] Federal Institute for Geosciences and Natural Resources (BGR), 30655 Hannover, Germany;Leibniz Institute for Applied Geophysics (LIAG), 30655 Hannover, Germany;State Authority for Mining, Energy and Geology (LBEG), 30655 Hannover, Germany;

关键词: airborne electromagnetics;    airborne magnetics;    airborne radiometrics;    groundwater;    soil;    freshwater lenses;   

DOI  :  10.3390/rs12101629

来源: DOAJ

【 摘 要 】

The knowledge of the subsurface down to about one hundred meters is fundamental for a variety of economic, ecological, and geoscientific tasks, particularly in coastal zones. Marine and terrestrial processes influence coastal zones and both seawater intrusion and submarine freshwater discharges may occur. The Federal Institute for Geosciences and Natural Resources (BGR) conducted airborne geophysical surveys in the coastal region of the German Bight between 2000 and 2014. The helicopter-borne system used simultaneously collected electromagnetic (HEM), magnetic (HMG), and radiometric (HRD) data. An area of about 5900 km² was covered with parallel flight lines at 250 m line separation and additional tie-lines at larger separations. In total, about 25,000 km of data at sampling distances of 4 m (HEM, HMG) and 40 m (HRD) were acquired. The electrical resistivity (HEM), the anomalies of the magnetic field (HMG), and the exposure rate (HRD) are the resulting geophysical parameters derived from the data. The results are displayed as maps of the geophysical parameters as well as vertical resistivity sections (only HEM). Both data and products are publicly available via BGR’s product center. The airborne geophysical results helped to outline the fresh–saline groundwater interface, freshwater lenses on islands, submarine groundwater discharges, buried tunnel valleys, mires, and ancient landscapes.

【 授权许可】

Unknown