Internal structure and permafrost characteristics of the rock glaciers of Southern Carpathians (Romania) assessed by geoelectrical soundings and thermal monitoring

Auteur(s) et Affiliation(s)



Description :
Six rock glaciers in the Southern Carpathians have been investigated by means of geoelectrical soundings in order to detect their internal stratigraphy and the existence of frozen sediments. In the case of 3 relict rock glaciers, the electrical resistivity measurements indicated a typical internal structure. Low resistivity values which are typical of unfrozen fine-grained materials were obtained, but high resistivity values measured in the Pietroasa, Ieşu and Pietrele rock glaciers denote the presence of sediments cemented by interstitial ice and ice lenses. Based on the moderate resistivity values, the ice content is probably low to medium in the upper portion of these rock glaciers. At 2 sites (Pietroasa and Văiuga rock glaciers), ground surface temperature (GST) evolution was monitored using digital dataloggers. Considering the thick active layer, the reduced ice content and the presence of scarce vegetation on their surface it could be assumed that the permafrost exists in marginal conditions in the Southern Carpathians.


Type de document :
Article de périodique

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2013, vol. 95, n°. 3, p. 249-266, nombre de pages : 18, Références bibliographiques : 2 p.

Date :
2013

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