Two-dimensional Inversion of wideband spectral data from the Capacitively Coupled Resistivity method – First Applications in periglacial environments

Jan Mudler, Andreas Hördt, Anita Przyklenk, Gianluca Fiandaca, Pradip Kumar Maurya, Christian Hauck
2019 The Cryosphere Discussions  
<p><strong>Abstract.</strong> The Capacitively Coupled Resistivity (CCR) method determines the electrical resistivity and permittivity by analysing the spectra of magnitude and phase shift of the electrical impedance. The CCR is well suited for the application in cryospheric and periglacial areas, because these areas provide the required physical conditions and logistical advantages of the method regarding the problems of coupling on highly resistive grounds and in some cases hard surfaces.
more » ... e the electrical properties of ice and frozen material have a strong frequency dependence, broad spectral measurements can deliver complementary information compared to conventional low-frequency techniques. For the inversion of the data, we modified an existing 2-D inversion code originally developed for low-frequency Induced Polarization data by including a Cole-Cole parametrization of electrical permittivity. We discuss the application of the code and particular aspects related to capacitively coupled measurements using data from two sites with cryospheric influence: the Schilthorn massif in the Swiss Alps and the frozen lake Prestvannet in the northern part of Norway. We investigate the effect of capacitive sensor height above the surface and corroborate the assumption that it is negligible for highly resistive conditions. The first results agree reasonably well with known subsurface structure and measurements reported in the literature. We conclude that a spectral 2-D inversion with a Cole-Cole parametrization of permittivity is a feasible tool to invert CCR data in periglacial environments.</p>
doi:10.5194/tc-2018-288 fatcat:43v6vioxrbg4jiz3zhw4yozicy