CGRG Bibliography of Canadian Geomorphology
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Author : Fabre, D.; and Ribolini, A.
Date : 2004.
Title : Geoelectrical resistivity of some rock glaciers in the Wrangell-St Elias Range, Alaska-Yukon.
Publication : European Geosciences Union. 1st General Assembly. Nice, France, 25 - 30 April 2004.
Issue : EGU04-A-07883.
Page(s) :
Abstract
Rock glaciers in the Southern (McCarthy sector, Alaska) and the North-Eastern (Kluane sector, Yukon, Canada) flanks of Wrangell-St Elias Range were studied in order to characterize their permafrost contents. This chain, developing between 59 and 62 degrees of Northern latitude, represents a barrier for the atmospheric circulation, dividing a more humid Pacific slope (mean annual precipitation P > 2,000 mm) from a dry internal Canadian slope (P < 500 mm). These different climatic conditions controls the glacier extension and shape and, likely, also the permafrost distribution on the opposite sides of the chain. Dipole-dipole electrical soundings were performed on the Kennicott rock glacier (Mc-Carthy sector), that flows downward from 1,200 m up to 900 m a.s.l. in the proximity of the Kennicott glacier snout. In the Kluane sector, the lower limit of the discontinuous permafrost is established around 800 m a.s.l., a little above the Yukon continental shelf, and the rock glaciers are particularly widespread in piedmont chains of Dalton Range and Kluane Range. The geoelectrical soundings were performed in three sites (Dalton Range, East Slims River, Sheep Mountain rock glaciers) already measured in a previous (1991) field work, using the same BM1 apparatus and array orientation (Evin, Fabre & Johnson, PPP vol. 8, 179-189). The geoelectrical results are interpreted for all the investigated sites. The 1991-2003 variations in permafrost conditions (ice content, thickness) for the Kluane sector are discussed.
Bibliography of Canadian Geomorphology