Geoelectrics & Electromagnetics
The section conducts experimental and theoretical research to image the subsurface structure and to characterize processes that change the subsurface using electromagnetic methods. Imaging und chracterization therefore base on the physical properties electrical conductivity, dielectric permitivity and magnetic permeability.
Research
The research of section 2 aims on the advancement of existing and the development of new electromagnetic methods. We focus our work on improving the ability to image dynamic processes such as the spatial and temporal variation of the salt/fresh water interface in coastal regions. Further, we develop scale- and method-independent approaches to enhance the reliability of parameter distributions used to inform subsurface modeling. Finally, we deliver high-resolution subsurface models to allows for sedimentological investigations.
Within the research field of Geoelectrics we target on the dc-resistivity method. Of special interest are large-scale layouts and monitoring experiments as well as developing data interpretation software. The research field surface-NMR advances the technique to conduct NMR experiments by using large coils placed at the Earths surface that allows for deriving hydrological parameter. The Georadar group conducts research in the field of high-frequency electromagnetic wave to investigate groundwater-systems, sedimentological questions and the detection of explosive ordnances. The developments in the fields of measurement equipment as well as modeling and inversion technqiues are focussed on the above mentioned methods while the modeling and inversion group deals with handling partial differential equations, mainly maxwells-equations. Further they develop modern inverse modeling approaches and data-processing algorithms, mainly for improved characterization of coastal aquifers and the critical zone.
Selected current projects
- DESMEX 2 & DEXMEX real
Deep Electromagnetic Soundings for Mineral EXploration - DynaDeep
The Dynamic Deep Subsurface of High-Energy Beaches - BlueTransition
How to make my region climate resilient - KiSNeT
Königshafen Submarine Groundwater Discharge Network - MoreSpin
Mobile Magnetic Resonance Sensor with supraconducting coil for prepolarization in the near surface soil - TONIA
plot-specific optimized nutrition management in precision agriculture - Counter-IED 3
Detection of Improvised Explosive Devices (IEDs) with GPR
News & Dates
- 1.-3.2. BlueTransition Kick-Off
- 27.2.-3.3. DynaDeep comparison campaign
- 5.-9.3. DGG conference
- 17.-21.4., 12.-16.6., 1.-4.8. DynaDeep ERT
- 4.-8.9. IP Summer School
- 11.-22.9. DESMEXreal campaign Harz
- 20.-22.9. Blue Transition Workshop
- 25.-29.9. EMTF Workshop
- 15.-19.10. Saltwater Intrusion Meeting
- 13.-15.11. 3D EM Symposium
Selected Publications
- Rochlitz, R., Becken, M. & Günther, T. (2023): Three-dimensional inversion of semi-airborne electromagnetic data with a second-order finite-element forward solver, Geophysical Journal International 234(1), 528-545. doi:10.1093/gji/ggad056.
- Wadas, S.H., Buness, H., Rochlitz, R., Skiba, P., Günther, T., Grinat, M., Tanner, D.C., Polom, U., Gabriel, G. & Krawczyk, C.M. (2022): Geophysical analysis of an area affected by subsurface dissolution – case study of an inland salt marsh in northern Thuringia, Germany. Solid Earth, 13: 1673-1696, doi:10.5194/se-13-1673-2022.
- Stadler, S. & Igel, J. (2022): Developing Realistic FDTD GPR Antenna Surrogates by Means of Particle Swarm Optimization. - IEEE Transactions on Antennas and Propagation, 70(6): 4259-4272. doi:10.1109/TAP.2022.3142335
- Hiller, T., Costabel, S., Dlugosch, R. & Müller-Petke, M. (2021): First Measurements of Surface Nuclear Magnetic Resonance Signals Without an Oscillating Excitation Pulse–Exploiting Non-Adiabatic Prepolarization Switch-Off. -Geophysical Research Letters, 48(23), e2021GL095371, doi:10.1029/2021GL095371
- Hiller, T., Costabel, S., Radic, T., Dlugosch, R. & Müller-Petke, M. (2021): Feasibility study on prepolarized surface nuclear magnetic resonance for soil moisture measurements. - Vadose Zone Journal, 20(5): e20138. doi:10.1002/vzj2.20138
- Rochlitz, R., Seidel, M. & Börner, R.-U. (2021): Evaluation of three approaches for simulating 3-D time-domain electromagnetic data. - Geophysical Journal International, 227 (3), 1980-1995. doi:10.1093/gji/ggab302
- Skibbe, N., Günther, T. & Müller-Petke, M. (2021): Improved hydrogeophysical imaging by structural coupling of two-dimensional magnetic resonance and electrical resistivity tomography. - Geophysics, 86 (5): WB135-WB146. doi:10.1190/geo2020-0593.1
