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Université de Fribourg

The length of the world’s glaciers – a new approach for the global calculation of center lines

Machguth, Horst ; Huss, Matthias

In: The Cryosphere, 2014, vol. 8, no. 5, p. 1741–1755

Glacier length is an important measure of glacier geometry. Nevertheless, global glacier inventories are mostly lacking length data. Only recently semi-automated approaches to measure glacier length have been developed and applied regionally. Here we present a first global assessment of glacier length using an automated method that relies on glacier surface slope, distance to the glacier margins...

Université de Fribourg

Robust changes and sources of uncertainty in the projected hydrological regimes of Swiss catchments

Addor, Nans ; Rössler, Ole ; Köplin, Nina ; Huss, Matthias ; Weingartner, Rolf ; Seibert, Jan

In: Water Resources Research, 2014, p. -

Projections of discharge are key for future water resources management. These projections are subject to uncertainties, which are difficult to handle in the decision process on adaptation strategies. Uncertainties arise from different sources such as the emission scenarios, the climate models and their post-processing, the hydrological models and natural variability. Here we present a detailed...

Université de Fribourg

Interdisciplinary assessment of complex regional water systems and their future evolution: how socioeconomic drivers can matter more than climate

Reynard, Emmanuel ; Bonriposi, Mariano ; Graefe, Olivier ; Homewood, Christine ; Huss, Matthias ; Kauzlaric, Martina ; Liniger, Hanspeter ; Rey, Emmanuel ; Rist, Stephan ; Schädler, Bruno ; Schneider, Flurina ; Weingartner, Rolf

In: Wiley Interdisciplinary Reviews: Water, 2014, vol. 1, no. 4, p. 413–426

Modeling of future water systems at the regional scale is a difficult task due to the complexity of current structures (multiple competing water uses, multiple actors, formal and informal rules) both temporally and spatially. Representing this complexity in the modeling process is a challenge that can be addressed by an interdisciplinary and holistic approach. The assessment of the water system...

Université de Fribourg

A high-resolution bedrock map for the Antarctic Peninsula

Huss, Matthias ; Farinotti, Daniel

In: The Cryosphere, 2014, vol. 8, no. 4, p. 1261–1273

Assessing and projecting the dynamic response of glaciers on the Antarctic Peninsula to changed atmospheric and oceanic forcing requires high-resolution ice thickness data as an essential geometric constraint for ice flow models. Here, we derive a complete bedrock data set for the Antarctic Peninsula north of 70° S on a 100 m grid. We calculate distributed ice thickness based on surface...

Université de Fribourg

Hydrological Implications of Covering Wind-Blown Snow Accumulations with Geotextiles on Mount Aragats, Armenia

Nestler, Alexander ; Huss, Matthias ; Ambartzumian, Rouben ; Hambarian, Artak

In: Geosciences, 2014, vol. 4, no. 3, p. 73–92

Snow is an excellent water reservoir, naturally storing large quantities of water at time scales from a few days to several months. In summer-dry countries, like Armenia, runoff due to snow melt from mountain regions is highly important for a sustained water supply (irrigation, hydropower). Snow fields on Mount Aragats, Armenia’s highest peak, often persist until July, providing vital amounts...

Université de Fribourg

Hazard assessment of glacial lake outburst floods from Kyagar glacier, Karakoram mountains, China

Haemmig, Christoph ; Huss, Matthias ; Keusen, Hansrudolf ; Hess, Josef ; Wegmüller, Urs ; Ao, Zhigang ; Kulubayi, Wubuli

In: Annals of Glaciology, 2014, vol. 55, no. 66, p. 34–44

Kyagar glacier is located in the Chinese Karakoram mountains. The glacier tongue entirely blocks the riverbed in the upper Shaksgam valley and impounds a glacial lake, which was the source of several violent and disastrous glacial lake outburst floods (GLOFs). A GLOF early warning system was implemented between 2011 and 2013. We present an integrative analysis of the hazard potential of Kyagar...

Université de Fribourg

The bedrock topography of Starbuck Glacier, Antarctic Peninsula, as determined by radio-echo soundings and flow modeling

Farinotti, Daniel ; King, Edward C. ; Albrecht, Anika ; Huss, Matthias ; Gudmundsson, G. Hilmar

In: Annals of Glaciology, 2014, vol. 55, no. 67, p. 22–28

A glacier-wide ice-thickness distribution and bedrock topography is presented for Starbuck Glacier, Antarctic Peninsula. The results are based on 90 km of ground-based radio-echo sounding lines collected during the 2012/13 field season. Cross-validation with ice-thickness measurements provided by NASA's IceBridge project reveals excellent agreement. Glacier-wide estimates are derived using a...

Université de Fribourg

Assessing the sustainability of water governance systems: the sustainability wheel

Schneider, Flurina ; Bonriposi, Mariano ; Graefe, Olivier ; Herweg, Karl ; Homewood, Christine ; Huss, Matthias ; Kauzlaric, Martina ; Liniger, Hanspeter ; Rey, Emmanuel ; Reynard, Emmanuel ; Rist, Stephan ; Schädler, Bruno ; Weingartner, Rolf

In: Journal of Environmental Planning and Management, 2014, p. 1–24

We present and test a conceptual and methodological approach for interdisciplinary sustainability assessments of water governance systems based on what we call the sustainability wheel. The approach combines transparent identification of sustainability principles, their regional contextualization through sub-principles (indicators), and the scoring of these indicators through deliberative...

Université de Fribourg

An upper-bound estimate for the accuracy of glacier volume–area scaling

Farinotti, Daniel ; Huss, Matthias

In: The Cryosphere, 2013, vol. 7, no. 6, p. 1707–1720

Volume–area scaling is the most popular method for estimating the ice volume of large glacier samples. Here, a series of resampling experiments based on different sets of synthetic data is presented in order to derive an upper-bound estimate (i.e. a level achieved only within ideal conditions) for its accuracy. For real-world applications, a lower accuracy has to be expected. We also quantify...

Université de Fribourg

Towards remote monitoring of sub-seasonal glacier mass balance

Huss, Matthias ; Sold, Leo ; Hoelzle, Martin ; Stokvis, Mazzal ; Salzmann, Nadine ; Farinotti, Daniel ; Zemp, Michael

In: Annals of Glaciology, 2013, vol. 54, no. 63, p. 75–83

This study presents a method that allows continuous monitoring of mass balance for remote or inaccessible glaciers, based on repeated oblique photography. Hourly to daily pictures from two automatic cameras overlooking two large valley glaciers in the Swiss Alps are available for eight ablation seasons (2004–11) in total. We determine the fraction of snow-covered glacier surface from...