Journal
EARTH SURFACE PROCESSES AND LANDFORMS
Volume 36, Issue 8, Pages 1105-1112Publisher
WILEY-BLACKWELL
DOI: 10.1002/esp.2138
Keywords
ribbed moraine; instability model; numerical computation
Funding
- Science Foundation Ireland mathematics initiative [06/MI/005]
- NERC [NE/D013070/1]
- NERC [NE/D011175/1] Funding Source: UKRI
- Natural Environment Research Council [NE/D011175/1] Funding Source: researchfish
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We develop numerical solutions of a theoretical model which has been proposed to explain the formation of subglacial bedforms. The model has been shown to have the capability of producing bedforms in two dimensions, when they may be interpreted as ribbed moraine. However, these investigations have left unanswered the question of whether the theory is capable of producing fully three-dimensional bedforms such as drumlins. We show that, while the three-dimensional calculations show realistic quasi-three-dimensional features such as dislocations in the ribbing pattern, they do not produce genuine three-dimensional drumlins. We suggest that this inadequacy is due to the treatment of subglacial drainage in the theory as a passive variable, and thus that the three-dimensional forms may be associated with conditions of sufficient subglacial water flux. Copyright (C) 2011 John Wiley & Sons, Ltd.
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