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Characteristics and origin of rock glaciers in northern Tien Shan (Kazakhstan/Kyrgyzstan)


Bolch, Tobias; Gorbunov, Aldar P (2014). Characteristics and origin of rock glaciers in northern Tien Shan (Kazakhstan/Kyrgyzstan). Permafrost and Periglacial Processes, 25(4):320-332.

Abstract

Northern Tien Shan is characterised by a distinct periglacial belt that contains many rock glaciers with an area of 1km² or more. To investigate the reason for their large size and variable occurrence, we analysed a representative subsample of the rock glaciers with respect to topographic and climatic variables. A simple permafrost model indicates that the rock glaciers originate in the zone where permafrost occurrence is very likely and some large rock glaciers flow down to elevations where permafrost is unlikely to exist outside the rock glaciers themselves. Correlation and multiple regression analyses revealed that the occurrence and characteristics of the rock glaciers can only be partly explained by the characteristics of the contributing area (e.g. its area or the headwall height). The correlation is greater with talus-type rock glaciers than with moraine-type rock glaciers. The climate can explain the general occurrence of rock glaciers but not their specific characteristics. It is hypothesised that the main reason for the specific distribution and characteristics of these large rock glaciers relates to the interaction with polythermal glaciers, topographic characteristics, intensive weathering and rock avalanches triggered by seismic activity.

Northern Tien Shan is characterised by a distinct periglacial belt that contains many rock glaciers with an area of 1km² or more. To investigate the reason for their large size and variable occurrence, we analysed a representative subsample of the rock glaciers with respect to topographic and climatic variables. A simple permafrost model indicates that the rock glaciers originate in the zone where permafrost occurrence is very likely and some large rock glaciers flow down to elevations where permafrost is unlikely to exist outside the rock glaciers themselves. Correlation and multiple regression analyses revealed that the occurrence and characteristics of the rock glaciers can only be partly explained by the characteristics of the contributing area (e.g. its area or the headwall height). The correlation is greater with talus-type rock glaciers than with moraine-type rock glaciers. The climate can explain the general occurrence of rock glaciers but not their specific characteristics. It is hypothesised that the main reason for the specific distribution and characteristics of these large rock glaciers relates to the interaction with polythermal glaciers, topographic characteristics, intensive weathering and rock avalanches triggered by seismic activity.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2014
Deposited On:09 Dec 2014 14:27
Last Modified:05 Apr 2016 18:35
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:1045-6740
Additional Information:This is the accepted version of the following article: Bolch, Tobias; Gorbunov, Aldar P (2014). Characteristics and origin of rock glaciers in northern Tien Shan (Kazakhstan/Kyrgyzstan). Permafrost and Periglacial Processes, 25(4):320-332., which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/ppp.1825/abstract
Publisher DOI:https://doi.org/10.1002/ppp.1825
Permanent URL: https://doi.org/10.5167/uzh-101925

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