Bore-hole video and photographic cameras

Auteurs :
KOERNER, R. M.
FISHER, D. A.
PARNANDI, M.

Description :
35 mm still and television techniques are shown to be of great value in following changes at the bedrock/ice interface and along borehole walls during closure over one or more years in polar or subpolar ice-caps. No evidence has been found of basal slip over a one year period in a 137 m holed at the top of the flow line on an ice-cap in northern Ellesmere Island. However, the bore hole has deformed to an elliptical cross-section near the bed and some pronounced extrusion-like layers have developed within 3 m of the bed in dirty ice in the year since drilling.


Type de document :
Article de périodique

Source :
Annals of Glaciology Cambridge, 1982, vol. 2, p. 34-38, Références bibliographiques : 4 réf.

Date :
1982