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The influence of bedrock orientation on the landscape evolution, surface morphology and denudation (10Be) at the Niesen, Switzerland

Auteur(s) et Affiliation(s)

Inst. of Geological Sciences, Univ., Bern, Suisse
DELUNEL, R.
Inst. of Geological Sciences, Univ., Bern, Suisse
Inst. of Geological Sciences, Univ., Bern, Suisse
AKÇAR, N.
Inst. of Geological Sciences, Univ., Bern, Suisse
KUBIK, P.
Inst. of Particle Physics, ETH, Zürich, Suisse


Description :
The study site is located in the Bernese Oberland, between the Frutigen and Diemtigen Valleys. The Niesen nappe presents here a unique setting in which opposite facing flanks host basins underlain by identical lithologies, but contrasting litho-tectonic architectures where lithologies either dip parallel to the topographic slope or in the opposite direction. While the contrasting dip-orientations of the underlying flysch bedrock has promoted hillslope and channelized processes to contrasting extents and particularly the occurrence of large landslides on the dip slope flank, the flank averaged beryllium-10 (10Be)-derived denudation rates are very similar. The denudation rates reveal a positive correlation to mean basin elevation that is interpreted as having been controlled by climatically driven factors. These findings illustrate that while the landscape properties in this part of the northern Alpine border can mainly be related to the tectonic architecture of the underlying bedrock, the denudation rates have a strong orographic control through elevation dependent mean annual temperature and precipitation.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2014, vol. 39, n°. 9, p. 1153-1166, nombre de pages : 14, Références bibliographiques : 2 p.

Date :
2014

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
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