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On the potential use of glacier and permafrost observations for verification of climate models
(1997)Annals of GlaciologyWhile the capability of global and regional climate models in reproducing current climate has significantly improved over the past few years, the confidence in model results for remote regions, or those where complex orography is a dominant feature, is still relatively low. This is, in part, linked to the lack of observational data for model verification and intercomparison purposes. Glacier and permafrost observations are directly ...Journal Article -
Measurements of ice deformation at the confluence area of Unteraargletscher, Bernese Alps, Switzerland
(1997)Journal of GlaciologyAn experimental study of ice deformation at the confluence area of Unteraargletscher, Bernese Alps, Switzerland, has been carried out. Surface velocities were measured by repeatedly surveying stakes and with the use of remote-sensing methods. The variation of the vertical strain rates with depth was measured in boreholes. The confluence center line is subjected to longitudinal horizontal extension, which is exceeded in magnitude by a ...Journal Article -
Analysing the creep of mountain permafrost using high precision aerial photogrammetry: 25 years of monitoring Gruben Rock Glacier, Swiss Alps
(1997)Permafrost and Periglacial ProcessesAerophotogrammetrical monitoring of Gruben rock glacier over the period 1970 to 1995 results in a unique time series documenting the three‐dimensional surface kinematics of creeping mountain permafrost. In places, the area under study is affected by historical fluctuations of the polythermal Gruben glacier. Changes in elevation and surface velocities were measured over five consecutive five‐year periods using an advanced photogrammetric ...Journal Article -
Ice deformation at the confluence of two glaciers investigated with conceptual map-plane and flowline models
(1997)Journal of GlaciologyUsing analytical and numerical techniques, a two-dimensional (2-D) map-plane model and a 2-D flowline model are utilized to elucidate the horizontal and vertical ice deformation at the confluence of two glaciers. For a perfectly symmetrical confluence, the junction point of the two tributaries can be modeled as a no-slip/free-slip transition. A strongly localized surface depression develops around the junction point, accompanied by two ...Journal Article -
Clast collision frequency as an indicator of glacier sliding rate
(1997)Journal of GlaciologyThe mechanical interaction between a glacier and subglacial sediment can be observed using an instrumented rod that we refer to as the UBC ploughmeter. For clast-rich sediments, the rate of collision between clasts and a rod dragged through these sediments should be related to the glacier sliding rate. By assuming that proglacial measurements of sediment granulometry represent the subglacial granulometry of Trapridge Glacier, Yukon ...Journal Article -
Increase in flood risk due to bedload examples from the Swiss Alps
(1997)International Journal of Sediment ResearchFloods in the Alps often cause bedload aggradation in the lower reaches of rivers. This leads to a reduction of the cross-sectional area of the channel and an overflow of water. To assess the safety against flooding for such areas the bedload potential in the catchment area has to be estimated and compared to the transport capacity of the lower reach. The sensitivity of the results has to be examined considering several scenarios with ...Journal Article -
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Slope stability problems related to glacier shrinkage and permafrost degradation in the Alps
(1997)Eclogae Geologicae HelvetiaeJournal Article -
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Kolk an Quaderelementen
(1997)Österreichische Wasser- und AbfallwirtschaftDie heute vorliegenden Forschungsresultate zum Kolkvorgang an quaderförmigen Flusseinbauten werden vorgestellt. Anhand der Literaturübersicht lassen sich Schlussfolgerungen hinsichtlich der zeitlichen Kolkentwicklung, der Kolkendtiefe und der Kolkgeometrie ziehen. Nahezu alle Aussagen beziehen sich dabei auf Kolke im Zusammenhang mit Brückenwiderlagern, es liegen keine Angaben zu quaderförmigen Flusseinbauten vor. Im Zusammenhang mit den ...Journal Article