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Seasonally intermittent water flow through deep fractures in an Alpine Rock Ridge : Gemsstock, Central Swiss Alps

Titelangaben

Phillips, Marcia ; Haberkorn, Anna ; Draebing, Daniel ; Krautblatter, Michael ; Rhyner, Hansueli ; Kenner, Robert:
Seasonally intermittent water flow through deep fractures in an Alpine Rock Ridge : Gemsstock, Central Swiss Alps.
In: Cold Regions Science and Technology. Bd. 125 (2016) . - S. 117-127.
ISSN 0165-232X
DOI: https://doi.org/10.1016/j.coldregions.2016.02.010

Angaben zu Projekten

Projekttitel:
Offizieller Projekttitel
Projekt-ID
Influences of snow cover on thermal and mechanical processes in steep permafrost rock walls
Ohne Angabe

Projektfinanzierung: Deutsche Forschungsgemeinschaft (KR3912/1-1)
Swiss National Science Foundation (Project No. 200021E-135531)

Abstract

Geological investigations and seismic refraction tomography reveal a series of 70° steep, parallel and continuous fractures at 2950masl within the Gemsstock rock ridge (Central Swiss Alps), at the lower fringe of alpine permafrost. Temperature measurements in a 40m horizontal borehole through the base of the ridge show that whilst conductive heat transfer dominates within the rock mass, brief negative and positive temperature anomalies are registered in summer. These have very small amplitudes and coincide with summer rainfall events lasting longer than 12h. In contrast, a complete lack of anomalous thermal signals during spring snowmelt suggests that runoff does not penetrate the open joints, despite high snow water equivalents of around 400mm. This is attributed to the development of an approximately 20cm thick, continuous and impermeable basal ice layer which forms at the interface between the snow cover and the cold rock on the shady North facing rock wall during snowmelt. Spring snowmelt water therefore does not affect rock temperatures in the centre of the rock mass, despite the presence of deep open joints. The mechanical impact of snowmelt infiltration on rock wall stability at depth is thus assumed to be negligible at this site.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Rock joints; Rock temperature; Rainwater infiltration; Basal ice layer; Snowmelt; Rock wall stability
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Geomorphologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
Eingestellt am: 08 Apr 2019 09:37
Letzte Änderung: 29 Aug 2023 10:53
URI: https://eref.uni-bayreuth.de/id/eprint/48596