News

 

Röthlisberger, V., Zischg, A. P., and Keiler, M.: A comparison of building value models for flood risk analysis, Nat. Hazards Earth Syst. Sci., 18, 2431-2453, https://doi.org/10.5194/nhess-18-2431-2018, 2018.

 

CARRIVICK, J. L., HECKMANN, T., TURNER, A., & FISCHER, M. 2018: An assessment of landform composition and functioning with the first proglacial systems dataset of the central European Alps. Geomorphology, 321, 117-128, doi:10.1016/j.geomorph.2018.08.030

Abstract: Proglacial systems are enlarging as glacier masses decline. They are in a transitory state from glacier-dominated to hillslope and fluvially-dominated geomorphological processes. They are a very important meltwater, sediment and solute source. This study makes the first quantitative, systematic and regional assessment of landform composition and functioning within proglacial systems that have developed in the short term since the Little Ice Age (LIA). Proglacial system extent was thus defined as the area between the LIA moraine ridges and the contemporary glacier. We achieved this assessment via a series of topographic analyses of 10 m resolution digital elevation models (DEMs) covering the central European Alps, specifically of Austria and Switzerland. Across the 2812 proglacial systems that have a combined area of 933 km2 , the mean proportional area of each proglacial system that is directly affected by glacial meltwater is 37%. However, there are examples where there is no glacial meltwater influence whatsoever due to complete disappearance of glaciers since the LIA, and there are examples where N90% of the proglacial area is probably affected by glacial meltwater. In all of the major drainage basins; the Inn, Drava, Venetian Coast, Po, Rhine, Rhone and Danube, the proportions of the combined land area belonging to each landform class is remarkably similar, with N10% fluvial, ~35% alluvial and debris fans, ~50% moraine ridges and talus/scree, and ~10% bedrock, which will be very helpful for considering estimates of regional sediment yield and denudation rates. We find groupings of the relationship between proglacial system hypsometric index and lithology, and of a slope threshold discriminating between hillslope and fluvialdominated terrain, both of which we interpret to be due to grain size. We estimate of contemporary total volume loss from all of these proglacial systems of 44 M m3 a−1 , which equates to a mean of 0.3 mm·a−1 contemporary surface lowering. Overall, these first quantifications of proglacial landform and landscape evolution will be an important basis for inter- and intra-catchment considerations of climate change effects on proglacial systems such as land stability, and changing water, sediment and solute source fluxes. Our datasets are made freely available

The topic of this course were landscape-changing processes and the thereby emerging risks in the Rheintal (CH/A), Vorarlberg (A) and Tirol (A). Diverse topics, like mountain slides, floods, debris flows, landslides or avalanches as well as different management strategies, were prepared and discussed. A special focus was the analyses of the spatial and temporal dynamics of landscape-changing processes and the assessment of the future development with respect to changing natural and social systems.

Thanks for the amazing course!

The staff and the masterstudents of the Research Group for Geomorphology, Natural Hazards and Risk Research visited on their field day the Meierisli landslide, which was reactivated during February 2018. In the field the group discussed the dynamics of the slide, the relevance for the Gürbe River and tried to understand the role of the protective mearues. Subsequently you can see some highlights of the field day:

Die Gruppe beim diskutieren der verschiedenen Rutschgebiete
The group is discussing the several slides in the Gürbe catchement
Grosses Staunen mitten im Rutschgebiet
The group is impressed by the damage
Der Weg ist immer wieder durchbrochen von Bruchlinien
The road is damaged by a lot of tension and shear cracks
Die Meierisli Rutschung erreicht zum ersten Mal das Gerinne der Gürbe
For the first time the Meierisli slide reaches the Gürbe channel