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(Article of periodic en Anglais - 2012)

Document title

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

Authors(s) and Affiliation(s)

WATANABE T. (1 2) ; MATSUOKA N. (3) ; CHRISTIANSEN H.H. (2) ;
(1) Graduate School of Life and Environmental Sciences, Univ., Tsukuba, JAPON
(2) Dept. of Geology, Univ. Centre in Svalbard, UNIS, Longyearbyen, NORVEGE
(3) Fac. of Life and Environmental Sciences, Univ., Tsukuba, JAPON

Abstract

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

Source

Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2012, vol. 94, no4 [pp. 445-457]

Bibliographic references : 40 ref.

Collation : 6 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 2704 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/j.1468-0459.2012.00470.x

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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