Journal cover Journal topic
Geographica Helvetica
Geogr. Helv., 73, 1-9, 2018
https://doi.org/10.5194/gh-73-1-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Standard article
08 Jan 2018
The bedrock topography of Gries- and Findelengletscher
Nadine Feiger1,2, Matthias Huss3,4, Silvan Leinss5, Leo Sold4, and Daniel Farinotti1,3 1Swiss Federal Institute for Forest, Snow and Landscape Research (WSL), Birmensdorf, Switzerland
2Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Zurich, Switzerland
3Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, Zurich, Switzerland
4Department of Geosciences, University of Fribourg, Fribourg, Switzerland
5Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland
Abstract. Knowledge of the ice thickness distribution of glaciers is important for glaciological and hydrological applications. In this contribution, we present two updated bedrock topographies and ice thickness distributions for Gries- and Findelengletscher, Switzerland. The results are based on ground-penetrating radar (GPR) measurements collected in spring 2015 and already-existing data. The GPR data are analysed using ReflexW software and interpolated by using the ice thickness estimation method (ITEM). ITEM calculates the thickness distribution by using principles of ice flow dynamics and characteristics of the glacier surface. We show that using such a technique has a significance advantage compared to a direct interpolation of the measurements, especially for glacier areas that are sparsely covered by GPR data. The uncertainties deriving from both the interpretation of the GPR signal and the spatial interpolation through ITEM are quantified separately, showing that, in our case, GPR signal interpretation is a major source of uncertainty. The results show a total glacier volume of 0.28 ± 0.06 and 1.00 ± 0.34 km3 for Gries- and Findelengletscher, respectively, with corresponding average ice thicknesses of 56.8 ± 12.7 and 56.3 ± 19.6 m.

Citation: Feiger, N., Huss, M., Leinss, S., Sold, L., and Farinotti, D.: The bedrock topography of Gries- and Findelengletscher, Geogr. Helv., 73, 1-9, https://doi.org/10.5194/gh-73-1-2018, 2018.
Publications Copernicus
Download
Short summary
This contribution presents two updated bedrock topographies and ice thickness distributions with a new uncertainty assessment for Gries- and Findelengletscher, Switzerland. The results are based on ground-penetrating radar (GPR) measurements and the ice thickness estimation method (ITEM). The results show a total glacier volume of 0.28 ± 0.06 and 1.00 ± 0.34 km3 for Gries- and Findelengletscher, respectively, with corresponding average ice thicknesses of 56.8 ± 12.7 and 56.3 ± 19.6 m.
This contribution presents two updated bedrock topographies and ice thickness distributions with...
Share