la ard sity o ersity 05; ac line 5 1. Thematic background and aim magnitude/high frequency events), and rock slides and saturated in ice, including massive ice lenses. Ice-supersaturated debris bodies deform under the influence of gravitational stress. This process leads to the for-Available online...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.487.2129 http://folk.uio.no/kaeaeb/publications/geomorph07.pdf |
| Summary: | la ard sity o ersity 05; ac line 5 1. Thematic background and aim magnitude/high frequency events), and rock slides and saturated in ice, including massive ice lenses. Ice-supersaturated debris bodies deform under the influence of gravitational stress. This process leads to the for-Available online at www.sciencedirect.com Geomorphology 93 (2008)⁎Rockglaciers are periglacial debris accumulations produced, deposited, and deformed over time scales of centuries tomillenia. They are efficient transport systems of rock-debris in the periglacial alpine environment. Rockglaciers originate from talus (‘talus-derived ’ rock-glaciers, see Fig. 1) and/or glacier-transported debris. Talus-derived rockglaciers are located at the foot of headwalls with a high supply of debris and represent a process chain linking frost weathering and rockfall (low debris flows (high-magnitude/low frequency events) from headwalls with debris displacement by permafrost creep. In general, the occurrence of these landforms is influenced primarily by climatic, topographic and geo-logical preconditions. Measured ice contents in active rockglaciers are in the order of 50 and 90 % (e.g. Haeberli et al., 1998; Konrad et al., 1999; Vonder Mühll et al., 2001; Arenson, 2002), i.e. the ice content is significantly larger than the pore volume. This implies that active rockglaciers are super-distribution patterns. The designed prototype model allows the numerical simulation of the spatial and temporal occurrence of talus-derived rockglaciers in the Upper Engadine (eastern Swiss Alps) during the Holocene. The dynamic model considers processes in the spatial and temporal domain and accounts for both external and internal processes, implemented by means of six |
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