<div class="csl-bib-body">
<div class="csl-entry">Moser, C., Roser, N. S., Keller, S., Radlbauer, D., Morra di Cella, U., Hauck, C., & Flores-Orozco, A. (2023, June). <i>3D Spectral Induced Polarization for the estimation of ice content and hydraulic properties in an active rock glacier</i> [Conference Presentation]. European Conference on Permafrost 2023, Puigcerda, Spain. http://hdl.handle.net/20.500.12708/189587</div>
</div>
-
dc.identifier.uri
http://hdl.handle.net/20.500.12708/189587
-
dc.description.abstract
Active rock glaciers play a major role in the hydrological cycle of high-mountain environments, for instance as they store water in form of ice and can act as a buffer for heavy rainfalls. However, methods to quantify subsurface ice and hydrogeological properties of rock glaciers are still an open area of research. Ice and water content can be measured by in situ methods in boreholes, which are spatially limited and expensive, while geophysical methods can provide high resolution yet indirect information about these subsurface properties. Here, we aim to quantify water content and hydraulic conductivity in the active layer and ice content in the permanently frozen layer by using the spectral induced polarization (SIP) method, which provides the frequency dependent conductive (conductivity) and capacitive properties (polarization) of the subsurface at low frequencies. While the water content is linked to the electrical conductivity through Archie’s law, the capacitive properties are used to define geophysical length scales, which relate to the pore geometry, to predict the hydraulic conductivity. Ice content estimations are associated with induced polarization effects observed above 10 Hz in SIP field measurements. We collected SIP mapping data along 8 crossing profiles in a frequency range of 0.1-200 Hz on the Gran Sometta rock glacier (Aosta Valley, Italy), consisting of two lobes, in October 2022. Estimations of the hydraulic conductivity are validated by high resolution resistivity monitoring data collected during the injection of a tracer-test, while ice content estimations are validated by laboratory investigations of frozen rock samples. The results demonstrate that both lobes of the Gran Sometta rock glacier contain a high ice content, with a lower ice content between the lobes. The highest hydraulic conductivity values based on SIP data are found in a range of cm/s which is in agreement with results of the tracer test.
en
dc.language.iso
en
-
dc.subject
Geophysics
en
dc.subject
Spectral Induced Polarization
en
dc.subject
Permafrost
en
dc.subject
3D
en
dc.subject
Rock glacier
en
dc.title
3D Spectral Induced Polarization for the estimation of ice content and hydraulic properties in an active rock glacier
