Water / Wastewater 61
© WSL-Institut für Schnee- und Lawinenforschung SLF
In the wet sludge layers that contain ice crystals, only low levels of seasonal variation in resistivity are registered. This is likely to be due to latent heat effects. These layers confirm that mountain permafrost can contain a substantial proportion of unfrozen water. The highest seasonal changes in electrical resistance are observed in ice-rich sediments.
The piezometer data indicate the presence of air, water or ice, and register seasonal pressure fluctuations in wet layers. All data collected highlight the heterogeneous and seasonally fluctuating nature of the substrate, as also shown in the various borehole stratigraphies.
Future findings
Future analyses will indicate daily, but also medium to long-term interannual and interseasonal changes in rock glacier water
© WSL-Institut für Schnee- und Lawinenforschung SLF
moisture content. Below a depth of 4.5 m, ground temperatures throughout the whole year are close to 0°C, making it difficult to decipher fluctuations in the ice and/or water content using thermal data. As such, continuous, cross-borehole ERT data provides useful additional information. The data illustrate vertical and lateral changes in resistivity, which enables us to identify phase changes in the active layer, as well as variations in the ice and/or water content in the permafrost lying beneath.
Authors Chasper Buchli, Samuel Weber, Jacopo Boaga, Mirko Pavoni, and Alexander Bast
Author Contact Details Marcia Phillips - Alpine Environment and Natural Hazards/Permafrost Group Leader, WSL Institute KELLER Druckmesstechnik AG • Address: St. Gallerstrasse 119, 8404 Winterthur, Switzerland • Tel: +41 52 235 25 25 • Email:
info@keller-pressure.com • Web:
keller-pressure.com
© Author(s) 2023. This work is distributed under the Creative Commons Attribution 4.0 License.
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© WSL-Institut für Schnee- und Lawinenforschung SLF
content, which will be correlated with meteorological variables. This information will contribute towards closing the gap in terms of directly quantifying the water content of rock glaciers and achieving a better understanding of the effects of climate change. The innovative combination of methods presented here will provide valuable insights into the local substrate characteristics of rock glaciers and, with that, contribute to our understanding of the factors that determine the acceleration of the kinematics of rock glaciers and the future water availability from these land forms.
Acknowledgement
The WSL Institute for Snow and Avalanche Research SLF would like to thank Roger Hübscher, Daniel Fries and Silvan Achtnich from Keller Druckmesstechnik AG for their invaluable support with the piezometers.
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