Gudmundsson, Hilmar, Bauder, Andreas, Lüthi, Martin, Fischer, Urs and Funk, Martin (1999) Estimating rates of basal motion and internal ice deformation from continuous tilt measurements. Annals of Glaciology, 28. pp. 247-252. ISSN 0260-3055
Full text not available from this repository.Abstract
Over a two-year period, continuous measurements of temporal changes in tilt, conducted with a string of tilt meters in a borehole on Unteraargletscher, Bernese Alps, Switzerland, have been used to estimate the basal-motion component. This estimation is based on a comparison of the measurements with synthetic tilt curves, computed using a parameterization of a simplified flow field. The best agreement is found for a ratio of basal motion to forward motion due to ice deformation (slip ratio) equal to about 1.2. Measured tilt curves exhibit a number of different transient features. While an overall increase in tilt angle is observed at every tilt-meter location, two of the sensors recorded anomalous tilt behaviour. These anomalies are characterized by sudden and drastic variations in tilt. A particularly intriguing example of such short-term tilt variations was recorded with a tilt meter positioned 40 m above the bed during the 1997 summer melt season.
Item Type: | Article |
---|---|
Subjects: | F800 Physical and Terrestrial Geographical and Environmental Sciences |
Department: | Faculties > Engineering and Environment > Geography and Environmental Sciences |
Depositing User: | Becky Skoyles |
Date Deposited: | 21 Feb 2019 10:19 |
Last Modified: | 10 Oct 2019 23:30 |
URI: | http://nrl.northumbria.ac.uk/id/eprint/38156 |
Downloads
Downloads per month over past year