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Allometric development of glacial cirque form: Geological, relief and regional effects on the cirques of Wales

Evans, I.S.



Headward and downward erosion near glacier sources, at rates exceeding fluvial erosion, is important in recent discussions of orogen development and the limits to relief. This relates to a long history of debate on how the form of glacial cirques develops, which can be advanced by relating shape to size in large data sets. For 260 cirques in Wales, this confirms different rates of enlargement in the three dimensions: faster in length than in width, and slower in vertical dimension whether expressed as overall height range, axial height range or wall height. Maximum gradient, plan closure and number of cols increase with overall size. This allometric development applies over different cirque types, regions and rock types. Headwall retreat, often by collapse following glacial erosion at the base, is faster than downward erosion. Welsh cirques form a scale-specific population and, as in other regions, size variables follow Gaussian distributions on a logarithmic scale. As in England, width commonly exceeds length. Vertical dimensions correlate with length more than with width. Cirque form varies with geology, but also with relief as both vary between mountain groups. The main contrast is between larger, better-developed cirques and higher relief on volcanic rocks in the north-west, and smaller, less-developed cirques and lower relief on sedimentary rocks in the south.


Evans, I. (2006). Allometric development of glacial cirque form: Geological, relief and regional effects on the cirques of Wales. Geomorphology, 80(3-4), 245-266.

Journal Article Type Article
Publication Date 2006-10
Deposit Date Mar 19, 2008
Publicly Available Date Mar 19, 2008
Journal Geomorphology
Print ISSN 0169-555X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 80
Issue 3-4
Pages 245-266
Keywords Glacial erosion, Cirque form, Allometry, Morphometry, Wales, Statistical graphic.


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