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Mudboil and ice-wedge dynamics investigated by electrical resistivity tomography, ground temperatures and surface movements in Svalbard

Auteur(s) et Affiliation(s)

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


Description :
The AA. applied electrical resistivity tomography (ERT) to understand near-surface conditions of 2 types of patterned ground, ice-wedge polygons and mudboils in Svalbard. Automated monitoring shows surface movement characterized by annual cycles of frost heave and thaw settlement, the amounts and rates of which are influenced by the intensity of ice segregation. A time series of ERT shows (1) a distinct resistivity boundary delimiting the active-layer depth, (2) seasonal variation in resistivity controlled by thermo-hydrological dynamics and (3) spatial variation in resistivity reflecting desiccation in summer and intensive ice segregation in winter. These results demonstrate ERT as a useful complementary technique for monitoring active-layer depths and near-surface hydrological conditions at periglacial patterned ground sites, where automated soil thermal and moisture measurements are limited.


Type de document :
Article de périodique

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2012, vol. 94, n°. 4, p. 445-457, nombre de pages : 13, Références bibliographiques : 40 ref.

Date :
2012

Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi

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