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12 - GPR soundings of rock glaciers on Svalbard

Published online by Cambridge University Press:  22 August 2009

By
I. Berthling ,
B. Etzelmüller ,
H. Farbrot ,
K. Isaksen ,
M. Wåle  and
R. Ødegård
Edited by
C. Hauck  and
C. Kneisel
C. Hauck
Affiliation:
Université de Fribourg, Switzerland
C. Kneisel
Affiliation:
University of Würzburg, Germany
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Summary

Introduction

GPR has been used for rock glacier investigations on the following four sites on Svalbard: Hiorthfjellet rock glacier (78° 15′ N, 15° 47′ E) close to Longyearbyen; four rock glaciers on the northwestern part of Prins Karls Forland (Forlandet) (78° 50′ N, 10° 30′ E); Brøggerbreen rock glacier (78° 54′ N, 11° 53′ E) close to Ny Ålesund; and on Nordenskiöldkysten (77° 53′ N 13° 54′ E). The Hiorthfjellet rock glacier is a typical tongue-shaped, talus-derived rock glacier, which is confined by the large bowl in the Hiorthfjellet mountainside. The Brøggerbreen and Forlandet rock glaciers are lobe-shaped talus-derived rock glaciers situated at the break of slope between the backing rockwall/talus slope and the valley bottom (Brøggerbreen) or strandflat area (Forlandet). On Nordenskiöldkysten, a large, complex talus-derived rock glacier, with a similar setting as those on Forlandet, was investigated.

Methods

All GPR profiles were collected using antennae of 50 MHz centre frequency, aligned perpendicular to the profile direction. Data from the Hiorthfjellet rock glacier were obtained during the winter season in 1997 and followed the central flowline of the Hiorthfjellet rock glacier. The length of the profile was 303 m. The radar used was of the type pulseEKKO 100 (Sensors & Software Inc. Mississauga, Canada). The transmitter/receiver antenna spacing was 2 m. Topographic data from the rock glacier on Hiorthfjellet were obtained from a geodetic survey and a digital altimeter.

Type
Chapter
Information
Applied Geophysics in Periglacial Environments , pp. 172 - 177
Publisher: Cambridge University Press
Print publication year: 2008

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References

Berthling, I., Etzelmüller, B., Isaksen, K. and Sollid, J. L. (2000). The rock glaciers on Prins Karls Forland (II): GPR soundings and the development of internal structures. Permafrost and Periglacial Processes, 11, 357–369.3.0.CO;2-6>CrossRefGoogle Scholar
Berthling, I., Etzelmüller, B., Wåle, M. and Sollid, J. L. (2003). Use of ground penetrating radar (GPR) soundings for investigating internal structures in rock glaciers. Examples from Prins Karls Forland, Svalbard. Zeitschrift für Geomorphologie, Supplement, 132, 103–121.Google Scholar
Farbrot, H., Isaksen, K., Eiken, T., Kääb, A. and Sollid, J. L. (2005). Composition and internal structures of a complex rock glacier at Nordenskiöldkysten, Svalbard. Norwegian Journal of Geography, 59, 139–148.Google Scholar
Isaksen, K., Ødegård, R. S., Eiken, T. and Sollid, J. L. (2000). Composition, flow and development of two tongue-shaped rock glaciers in the permafrost of Svalbard. Permafrost and Periglacial Processes, 11, 241–257.3.0.CO;2-A>CrossRefGoogle Scholar
Ødegård, R. S., Isaksen, K., Eiken, T. and Sollid, J. L. (2003a). A conceptual model of Hiorthfjellet rock glacier, Svalbard. Proceedings of the 8th International Conference on Permafrost, Zürich, Switzerland, 839–844.Google Scholar
Ødegård, R. S., Isaksen, K., Eiken, T. and Sollid, J. L. (2003b). Terrain analyses and surface velocity measurements of the Hiorthfjellet rock glacier, Svalbard. Permafrost and Periglacial Processes, 14, 359–365.CrossRefGoogle Scholar

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