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Université de Fribourg

Two-dimensional inversion of wideband spectral data from the capacitively coupled resistivity method – first applications in periglacial environments

Mudler, Jan ; Hördt, Andreas ; Przyklenk, Anita ; Fiandaca, Gianluca ; Maurya, Pradip Kumar ; Hauck, Christian

In: The Cryosphere, 2019, vol. 13, no. 9, p. 2439–2456

The DC resistivity method is a common tool in periglacial research because it can delineate zones of large resistivities, which are often associated with frozen water. The interpretation can be ambiguous, however, because large resistivities may also have other causes, like solid dry rock. One possibility to reduce the ambiguity is to measure the frequency-dependent resistivity. At low...

Université de Fribourg

Mountain permafrost degradation documented through a network of permanent electrical resistivity tomography sites

Mollaret, Coline ; Hilbich, Christin ; Pellet, Cécile ; Flores-Orozco, Adrian ; Delaloye, Reynald ; Hauck, Christian

In: The Cryosphere, 2019, vol. 13, no. 10, p. 2557–2578

Mountain permafrost is sensitive to climate change and is expected to gradually degrade in response to the ongoing atmospheric warming trend. Long-term monitoring of the permafrost thermal state is a key task, but problematic where temperatures are close to 0 ∘C because the energy exchange is then dominantly related to latent heat effects associated with phase change (ice–water), rather...

Université de Fribourg

The European mountain cryosphere: a review of its current state, trends, and future challenges

Beniston, Martin ; Farinotti, Daniel ; Stoffel, Markus ; Andreassen, Liss M. ; Coppola, Erika ; Eckert, Nicolas ; Fantini, Adriano ; Giacona, Florie ; Hauck, Christian ; Huss, Matthias ; Huwald, Hendrik ; Lehning, Michael ; López-Moreno, Juan-Ignacio ; Magnusson, Jan ; Marty, Christoph ; Morán-Tejéda, Enrique ; Morin, Samuel ; Naaim, Mohamed ; Provenzale, Antonello ; Rabatel, Antoine ; Six, Delphine ; Stötter, Johann ; Strasser, Ulrich ; Terzago, Silvia ; Vincent, Christian

In: The Cryosphere, 2018, vol. 12, no. 2, p. 759–794

The mountain cryosphere of mainland Europe is recognized to have important impacts on a range of environmental processes. In this paper, we provide an overview on the current knowledge on snow, glacier, and permafrost processes, as well as their past, current, and future evolution. We additionally provide an assessment of current cryosphere research in Europe and point to the different...

Université de Fribourg

Resolution capacity of geophysical monitoring regarding permafrost degradation induced by hydrological processes

Mewes, Benjamin ; Hilbich, Christin ; Delaloye, Reynald ; Hauck, Christian

In: The Cryosphere, 2017, vol. 11, no. 6, p. 2957–2974

Geophysical methods are often used to characterize and monitor the subsurface composition of permafrost. The resolution capacity of standard methods, i.e. electrical resistivity tomography and refraction seismic tomography, depends not only on static parameters such as measurement geometry, but also on the temporal variability in the contrast of the geophysical target variables (electrical...

Université de Fribourg

Numerical modelling of convective heat transport by air flow in permafrost talus slopes

Wicky, Jonas ; Hauck, Christian

In: The Cryosphere, 2017, vol. 11, no. 3, p. 1311–1325

Talus slopes are a widespread geomorphic feature in the Alps. Due to their high porosity a gravity-driven internal air circulation can be established which is forced by the gradient between external (air) and internal (talus) temperature. The thermal regime is different from the surrounding environment, leading to the occurrence of permafrost below the typical permafrost zone. This phenomenon...

Université de Fribourg

New insights on permafrost genesis and conservation in talus slopes based on observations at Flüelapass, Eastern Switzerland

Kenner, Robert ; Phillips, Marcia ; Hauck, Christian ; Hilbich, Christin ; Mulsow, Christian ; Bühler, Yves ; Stoffel, Andreas ; Buchroithner, Manfred

In: Geomorphology, 2017, vol. 290, p. 101–113

The talus slope at Flüelapass was the first mountain permafrost study site in Switzerland in the 1970s and the presence of ice-rich permafrost at the foot of the slope has been investigated in the context of several studies focusing on the role of snow cover distribution. We review previously developed hypotheses and present new ones using various data sources, such as temperature...

Université de Fribourg

Monitoring soil moisture from middle to high elevation in Switzerland: set-up and first results from the SOMOMOUNT network

Pellet, Cécile ; Hauck, Christian

In: Hydrol. Earth Syst. Sci., 2017, vol. 21, no. 6, p. 3199–3220

Besides its important role in the energy and water balance at the soil–atmosphere interface, soil moisture can be a particular important factor in mountain environments since it influences the amount of freezing and thawing in the subsurface and can affect the stability of slopes. In spite of its importance, the technical challenges and its strong spatial variability usually prevents soil...

Université de Fribourg

Semi-automated calibration method for modelling of mountain permafrost evolution in Switzerland

Marmy, Antoine ; Rajczak, Jan ; Delaloye, Reynald ; Hilbich, Christin ; Hoelzle, Martin ; Kotlarski, Sven ; Lambiel, Christophe ; Noetzli, Jeannette ; Phillips, Marcia ; Salzmann, Nadine ; Staub, Benno ; Hauck, Christian

In: The Cryosphere, 2016, vol. 10, no. 6, p. 2693–2719

Permafrost is a widespread phenomenon in mountainous regions of the world such as the European Alps. Many important topics such as the future evolution of permafrost related to climate change and the detection of permafrost related to potential natural hazards sites are of major concern to our society. Numerical permafrost models are the only tools which allow for the projection of the future...

Université de Fribourg

Warming permafrost and active layer variability at Cime Bianche, Western European Alps

Pogliotti, P. ; Guglielmin, M. ; Cremonese, E. ; Morra di Cella, U. ; Filippa, G. ; Pellet, C. ; Hauck, Christian

In: The Cryosphere, 2015, vol. 9, no. 2, p. 647–661

The objective of this paper is to provide a first synthesis on the state and recent evolution of permafrost at the monitoring site of Cime Bianche (3100 m a.s.l.) on the Italian side of the Western Alps. The analysis is based on 7 years of ground temperature observations in two boreholes and seven surface points. The analysis aims to quantify the spatial and temporal variability of ground surface...

Université de Fribourg

A multi-method field experiment to determine local groundwater flow in a glacier forefield

Kobierska, Florian ; Jonas, Tobias ; Griessinger, Nena ; Hauck, Christian ; Huxol, Stephan ; Bernasconi, Stefano M.

In: Hydrological Processes, 2015, vol. 29, no. 6, p. 817–827

We implemented multiple independent field techniques to determine the direction and velocity of groundwater flow at a specific stream reach in a glacier forefield. Time-lapse experiments were conducted using two electrical resistivity tomography (ERT) lines installed in a cross pattern. A circular array of groundwater tubes was also installed to monitor groundwater flow via discrete salt...