Ground penetrating radar investigations of open system pingos, Adventdalen, Svalbard

Permafrost geomorphological systems in a changing global climate. Special issue

Auteurs :
ROSS, N.
HARRIS, C.
CHRISTIANSEN, H.H.
BRABHAM, P.J.
HUMLUM, O.

Description :
Ground penetrating radar (GPR) investigations conducted on 2 open system pingos, Innerhytte pingo and Riverbed pingo, are described. Surface exposures suggest that both pingos are largely formed in weak Jurassic shales. Little evidence for the presence of large bodies of massive ice was found. Strong subsurface reflections within the core of both pingos are interpreted as representing either the presence of alternating shale and ice units, or variations in the chemistry, ice crystal properties or air content of pingo ice. Both pingos are characterized by conspicuous surface icings, with groundwater flow to the surface in late winter, prior to initiation of actve-layer thawing, suggesting derivation from a deep groundwater source.


Type de document :
Congrès

Source :
PACE21 Field Workshop, Longyearbyen, Norvege, 2004-09-08, Norsk geografisk tidsskrift, issn : 0029-1951, 2005, vol. 59, n°. 2, p. 129-138, nombre de pages : 10, Collation : Illustration, Références bibliographiques : 55 ref.

Date :
2005

Editeur :
Pays édition : Norvege, Oslo, Norske geografiske selskab ; Universitetsforlaget