Université de Fribourg

Dendrogeomorphologische Prozessanalyse zum Schwemmholzaufkommen und Rekonstruktion von Ufererosion zweier voralpiner Wildbachsysteme

Hitz, Oliver Markus ; Monbaron, Michel (Dir.) ; Strunk, Horst (Codir.)

Thèse de doctorat : Université de Fribourg, 2008 ; Nr. 1605.

Due to the global climate change an increase of heavy precipitation events on a regional scale is expected. Especially in Switzerland, damages from natural hazards resulting from heavy precipitation events occur every year. Damages arise from erosion and accumulation of bed load material or driftwood in mountain torrents and rivers. In mountain torrents, erosion of the embankments during high...

Université de Fribourg

Spatial and temporal occurrence of past debris flows in the Valais Alps : Results from tree-ring analysis

Bollschweiler, Michelle ; Monbaron, Michel (Dir.)

Thèse de doctorat : Université de Fribourg, 2007 ; Nr. 1572.

Debris flows are common mass-movement processes in most mountainous regions of the world, where their unpredictable and sudden occurrence represents a major threat to transportation corridors and settlements. Increased anthropogenic activity in regions exposed to debris-flow risk renders a detailed hazard assessment inevitable. However, archival data on past events remains scarce and, most of the...

Université de Fribourg

Spatio-temporal variations of rockfall activity into forests results from tree-ring and tree analysis

Stoffel, Markus ; Monbaron, Michel (Dir.) ; Kienholz, Hans (Codir.) ; Strunk, Horst (Codir.) ; Raetzo, Hugo (Codir.)

Thèse de doctorat : Université de Fribourg, 2005 ; Nr. 1480.

Rockfall represents one of the most common geomorphological processes in mountain regions and has extensively been studied in the past. Nonetheless, detailed data on frequencies (how often), volumes (how large), spatial distributions (where) or the seasonality (when) of rockfall activity remain scarce and most of the time fragmentary. Similarly, tree-ring analysis has only exceptionally been used...

Université de Fribourg

Contribution à l'étude du pergélisol de montagne en zone marginale

Delaloye, Reynald ; Monbaron, Michel (Dir.)

Thèse de doctorat : Université de Fribourg, 2004 ; no 1441.

The main objective of this thesis is the identification of mechanisms controlling the occurrence and the evolution of mountain permafrost in peripheral areas, i.e. where the presence of permafrost is strongly discontinuous, isolated, or even uncertain. This area has not been greatly studied so far. As investigations relating to the effects of climate warming on the alpine environment multiply,...

Université de Fribourg

Cave Genesis and its relationship to surface processes : investigations in the Siebenhengste region (BE, Switzerland)

Häuselmann, Philipp ; Monbaron, Michel (Dir.)

Thèse de doctorat : Université de Fribourg, 2002 ; Nr. 1383.

The Siebenhengste region is one of the most significant cave areas in the world. Its high density of cave passages that extend over 1500 m in altitude makes it a key site for the study of Alpine paleogeomorphology and paleoclimatology. The present thesis concentrates on St. Beatus Cave and Bärenschacht at the southern rim of the cave region. The tectonics, hydrogeology, speleogenesis,...