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Volumetric variations of glacier de Sarennes, French Alps, during the last two centuries

Abstract : The Glacier de Sarennes is located in the heart of the French Alps and has been observed closely since 1906 and regularly measured since 1948 (snow accumulation, ablation and mass balance). Several publications have stemmed from this research, such as the 1906 glaciological map, the 1958 one and the 1981 and 1991 photogrammetric analysis. In 1992, a field radar campaign determined the ice thickness and allowed the construction of the bedrock map with reasonable accuracy. The "little ice age" stage was reconstructed with the bed-rock tracks, in 1995. Above-mentioned documents were digitized and the computer programm Arc-Info permitted the calculation of the successive volume stages occupied by the glacier between 1850 and 1991. Cross sections and slope profiles illustrate the evolution of the thickness of the Glacier de Sarennes during the last hundred and fifty years. All of these results, consistent with the variation of the mass balance observed or restitued, show the main conclusion : compared with today's stage, the glacier was about 4 times more voluminous (loss of 3/4 of its ice volume) ninety years ago and 5 times bigger one and a half century ago in circa 1850.
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Submitted on : Thursday, May 14, 2020 - 5:29:55 PM
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  • HAL Id : hal-02575960, version 1
  • IRSTEA : PUB00002735



F. Valla, Christian Piedallu. Volumetric variations of glacier de Sarennes, French Alps, during the last two centuries. Annals of Glaciology, Cambridge University Press 1997, pp.2-7. ⟨hal-02575960⟩



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