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Hydrogeophysical Imaging and Characterisation

The research group “Hydrogeophysical Imaging and Characterisation” focusses on the high resolution hydrogeophysical imaging and characterisation of the unsaturated and saturated zone using high-frequency electromagnetic geophysical tools, electromagnetic induction (EMI) and ground penetrating radar (GPR).

Electromagnetic tools are important for a wide range of hydrogeological investigations because of their noninvasive character and the fairly quick measurement acquisition. The obtained electromagnetic parameters, electrical conductivity and relative permittivity, are of great interest to determine soil properties, e.g., clay content, porosity or hydrologic state variables including soil water content.
Our research focusses on modeling and inversion tools that explicitly take into account the electromagnetic wave propagation characteristics and return high resolution images of quantitative medium properties. Our three main research areas are:

Full-waveform inversion of off-ground, borehole and surface GPR

Conventional tomograms provided by standard ray-based methods have limited resolution, primarily because only a fraction of the information contained in the radar data is included in the inversion. Higher resolution radar tomograms can be derived by using full-waveform inversion schemes that take into account much of the recorded trace and exploit the full vector wavefield.

Three-dimensional imaging of subsurface structural patterns using quantitative large-scale multi-configuration electromagnetic

Quantitative multi-layer conductivity inversion of multi-configuration electromagnetic induction measurements

A new calibration method that uses electrical resistivity tomography (ERT) inversion eliminates instrumental shifts which often occur in EMI data and returns quantitative apparent electrical conductivity values. Using different orientations, different coil offsets, and different frequencies, different sensing depths are obtained that are used for a multi-layer inversion.

Dispersion inversion of GPR data recorded across surface waveguides

Strong contrasts occurring in the shallow subsurface due to precipitation events, freezing, and thawing events, etc. can result in the presence of electromagnetic waveguides that cause dispersive GPR data. These data need to be inverted using dedicated inversion approaches.



Open Positions:
PhD Position „3D GPR Full waveform inversion


BSc/MSc Thesis and Fellowship/Internship projects:
3D GPR imaging
Full-waveform inversion
Multi-layer multi-configuration EMI inversion
Inversion of waveguide dispersed GPR data
Please contact me for more details about the current projects


Contact:
Prof. Dr. Ir. Jan van der Kruk
Agrosphere (IBG-3)
Forschungszentrum Jülich GmbH
Leo Brandtstrasse
52425 Jülich
Germany

Phone: +49 2461 614077
Fax: +49 2461 612518
Email: j.van.der.kruk@fz-juelich.de

 

Hydrogeophysics Teaching

Faculty of Georesources and Materials Engineering

RWTH Aachen

Links:

IDEA League Joint Masters in Applied Geophysics

SEG-AGU Hydrogeophysics Workshop

Geoscientists Without Borders

The Near-Surface Geophysics Section of the Society of Exploration Geophysicists (SEG)

AGU Hydrogeophysics Committee

AGU Near Surface Focus Group


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