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Radio Soundings On Trapridge Glacier, Yukon Territory,Canada

  • R. H. Goodman (a1), G. K. C. Clarke (a2), G. T Jarvis (a3), S. G. Collins and Robert Metcalfe (a2)...

Abstract

As part of a program to study surge-type glaciers, a radar-depth survey, using a frequency of 620 MHz, has been made of Trapridge Glacier, Yukon Territory. Soundings were taken at 26 locations on the glacier surface and a maximum ice thickness of 143 m was measured. A rapid change in surface slope in the lower ablation region marks the boundary between active and stagnant ice and is suggestive of an “ice dam” or the water “collection zone” postulated by Robin and Weertman for surging glaciers.

Dans le cadre d’un programme d’étude des glaciers à crue, une prospection radar en profondeur dans une fréquence de 620 MHz, a été conduite sur le Trapridge Glacier, Territoire du Yukon. Les échos on¡ été recueillis en 26 points sur la surface du glacier et on a mesuré une épaisseur maximum de glace de 143 m. Un changement rapide dans la pente de la surface dans la zone inférieure d’ablation marque la limite entre la glace active et la glace stagnante, et suggère un “barrage de glace” ou un “bassin collecteur” d’eau dont Robin et Weertman postulèrent l’existence pour des glaciers à crue.

Zusammenfassung

Als Teil eines Programmes zum Studium von Gletschern des Surge-Typs wurde eine Radar-Auslotung des Trapridge Glacier im Yukon Territory durchgeführt. Die Messfrequenz betrug 620 MHz. Die Lotungen an 26 Stellen auf der Gletscheroberfläche ergaben eine Maximal-Dicke von 143 m. Ein jäher Wechsel der Oberflächenneigung im unteren Ablationsgebiet kennzeichnet die Grenze zwischen aktivem und stagnierendem Eis; er lässt einen “Eis-Damm” oder die “Sammelzone” des Wassers vermuten, wie sie von Robin und Weertman für ausbrechende Gletscher postuliert werden.

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Copyright

References

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Classen, D.F., Clarke, G.K.C. 1971 Basal hot spot on a surge type glacier. Nature, Vol. 229, No. 5285 p. 48183.
Collins, S.G. 1972 Survey of the Rusty Glacier area, Yukon Territory, Canada, 1967–70. Journal of Glaciology, Vol. 11, No. 62, p. 23553.
Evans, S., Smith, B.M.E.. 1969 A radio echo equipment for depth sounding in polar ice sheets. Journal of Scientific Instruments (Journal of Physics, E), Ser. 2, Vol. 2, No. 2, p. 13136.
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Goodman, R.H. 1975 Radio echo sounding on temperate glaciers. Jouranal of Glaciology, Vol. 14, No. 70,
Gudmandsen, P. 1969 Airborne radio echo sounding of the Greenland ice sheet. Geographical Journal,Vol. 135, Pt. 4, p. 54851.
Post, A.S. 1969 Distribution of surging glaciers in western North America. Journal of Glaciology,Vol. 8, No. 53, p. 22940.
Robin.de, G.Q, Weertman, J. 1973 Cyclic surging of glaciers. Journal of Glaciohgy, Vol. 12, No. 64, p. 318.
Sharp, R.P. 1947 The Wolf Creek glaciers, St. Elias Range Yukon Territory. Geographical Review,Vol. 37, No. 1, p. 2652.
Smith, B.M.E., Evans, S. 1972 Radio echo sounding: absorption and scattering by water inclusion and ice lenses. Journul of Glaciology, Vol. 11, No. 61, p. 13346

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