TY - JOUR
T1 - Evolution of large roches moutonnees
AU - Sugden, D. E.
AU - Glasser, N.
AU - Clapperton, C. M.
PY - 1992
Y1 - 1992
N2 - We develop an empirically-based model of the evolution of large roches moutonnees, based on features in eastern Scotland with lee side cliffs up to 160 m high. Block removal by ice begins some way down the lee slope of a hill or spur at a point where cavities start to form at the ice/rock interface. With time, block removal produces a cliff which retreats upglacier, producing a characteristic staircase morphology to the cliff in response to limiting crack length and the presence of pre-existing joints in the rock. The link between plucking and subglacial meltwater help to explain the distribution of roches moutonnees along the axis of the Dee valley, the location of a major ice stream within the former Scottish ice sheet. A narrow ice-marginal zone of plucking may migrate across the landscape as ice sheets wax and wane. -from Authors
AB - We develop an empirically-based model of the evolution of large roches moutonnees, based on features in eastern Scotland with lee side cliffs up to 160 m high. Block removal by ice begins some way down the lee slope of a hill or spur at a point where cavities start to form at the ice/rock interface. With time, block removal produces a cliff which retreats upglacier, producing a characteristic staircase morphology to the cliff in response to limiting crack length and the presence of pre-existing joints in the rock. The link between plucking and subglacial meltwater help to explain the distribution of roches moutonnees along the axis of the Dee valley, the location of a major ice stream within the former Scottish ice sheet. A narrow ice-marginal zone of plucking may migrate across the landscape as ice sheets wax and wane. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0027089062&partnerID=8YFLogxK
U2 - 10.1080/04353676.1992.11880368
DO - 10.1080/04353676.1992.11880368
M3 - Article
AN - SCOPUS:0027089062
SN - 0435-3676
VL - 74 A
SP - 253
EP - 264
JO - Geografiska Annaler, Series A
JF - Geografiska Annaler, Series A
IS - 2-3
ER -