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The topography of drumlins; assessing their long profile shape

Auteur(s) et Affiliation(s)

SPAGNOLO, M.
Environment and Geography Dep., Univ., Aberdeen, Royaume-Uni
CLARK, C.D.
Dep. of Geography, Univ., Sheffield, Royaume-Uni
HUGHES, A.L.C.
School of the Environment and Society, Univ., Swansea, Royaume-Uni
DUNLOP, P.
School of Environmental Sciences, Univ., Ulster, Royaume-Uni


Description :
Here the shape of the drumlin longitudinal profile of 29,238 drumlins in the British Isles has been analysed. Drumlins were grouped into flowsets for which a palaeo ice flow direction was inferred independently of the drumlin shape. Given such ice flow directions it was then possible to identify the upflow and downflow ends of each drumlin and to trace and extract its longitudinal profile. The results indicate that drumlin longitudinal profile is far from being the classically asymmetric shape widely reported in text-book descriptions. Drumlins are mostly symmetrical in shape with a very slight tendency towards the classical shape. This demonstrates that the idealized stoss–lee shape of classically-asymmetric drumlins is not representative of the population and should be replaced with that of mostly symmetric bumps. Drumlin shape is not a good indicator of the palaeo ice flow direction.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 6, p. 790-804, nombre de pages : 15, Références bibliographiques : 2 p.

Date :
2011

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

Langue :
Anglais
Droits :
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