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Ice- and soil-wedge dynamics in the Kapp Linné Area, Svalbard, investigated by two- and three-dimensional GPR and ground thermal and acceleration regimes

Auteur(s) et Affiliation(s)

WATANABE, T.
Graduate School of Life and Environmental Sciences, Univ., Tsukuba, Japon
Dept. of Geology, The Univ. Centre in Svalbard, Longyearbyen, Norvege
MATSUOKA, N.
Fac. of Life and Environmental Sciences, Univ., Tsukuba, Japon
CHRISTIANSEN, H.H.
Dept. of Geology, The Univ. Centre in Svalbard, Longyearbyen, Norvege


Description :
GPR is applied to image subsurface structures below non-sorted polygons in Kapp Linné, Svalbard, where ice and active-layer soil wedges co-exist within a small area. Two-dimensional GPR images ice wedges as hyperbolic reflections extending down from the frost table. However, some ice-wedge signals are obscured or masked by similar hyperbolic reflections produced by stones or active-layer soil wedges. Three-dimensional GPR images ice wedges as linear amplitude anomalies, which excludes the possibility of misinterpretation and offers more reliable results. GPR investigations show that ice wedges are distributed sporadically in lower (younger) beach ridges, but not in higher (older) ones. Inter-site monitoring of ground temperature, soil moisture, slow ground deformation and cracking during 2004–09 and the determination of near-surface soil texture and stratigraphy suggest that snow cover and soil thermal properties determine the distribution of ice wedges.


Type de document :
Article de périodique

Source :
Permafrost and periglacial processes, issn : 1045-6740, 2013, vol. 24, n°. 1, p. 39-55, nombre de pages : 17, Références bibliographiques : 2 p.

Date :
2013

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais
Droits :
Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI)