Geospatial analysis of controls on subglacial bedform morphometry in the New York Drumlin Field - implications for Laurentide Ice Sheet dynamics

Auteur(s) et Affiliation(s)



Description :
The outline and trend of 6566 subglacial bedforms in the New York Drumlin Field have been digitized from digital elevation data. A spatial predictive model has been used to extend values of bedform elongation over an area measuring 200 km × 110 km. The resulting surface is used in conjunction with depth-to-bedrock data and an assumed duration of ice residence to test 3 proposed controls on bedform elongation. Upon comparison, the resulting display of morphometry is best explained by differences in ice velocity across the field of study. The existence of multiple zones of fast-moving ice located along the southern margin of the Laurentide Ice Sheet is implied by the observed patterns of bedform elongation and orientation. The AA. present 2 interpretations that are consistent with the observations.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2009, vol. 34, n°. 8, p. 1126-1135, nombre de pages : 10, Références bibliographiques : 1,5 p.

Date :
2009

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