Miage Glacier (Mont Blanc Massif, Italy)

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Recent evolution of the largest debris covered glacier of the Italian Alps: Miage Glacier (Mont Blanc Massif, Italy) C. D’Agata (1) , G. Diolaiuti (1), A. Riccardi (1), C. Smiraglia (1), A. Zanutta (2) (1) “A. Desio” Department of Earth Sciences, University of Milan, Italy [email protected] (2) DISTART, University of Bologna, Italy This contribution focuses on the recent (last 30 years) evolution of Miage debris covered Glacier (Mont Blanc Massif, Italy) derived from historical maps, remote sensing measurements and field investigations. Historical cartography (1975 and 1991 maps) was processed by GIS and DEMs were calculated; in addition 2003 aerial photographs were analysed to obtain an orthophoto and a DEM to be compared with the others from cartography. The volume and area changes from 1975 up to 2003 were calculated and their accuracy was evaluated Dedicated Differential GPS (DGPS) field campaigns were carried out from 2002 summer up to now to evaluate the glacier surface velocity; the measurement network was constituted by 12 benchmarks located on the glacier surface along a longitudinal profile (from 1850 to 2350 m a.s.l.), in addition during the last summer season other 30 points, placed on the glacier surface along transversal profiles, were surveyed. At these locations also the glacier ablation and the debris cover thickness were measured. Miage debris covered Glacier in the period 1975-1991 showed a volume increase, it was followed by a strong volume loss occurred between 1991 and 2003. The surface velocity measured along the whole glacier tongue show higher values in the upper sector (range 60-90 m/y) and smaller ones in the lower sector close to glacier lobes (range 20-5 m/y). These data results in agreement with previous ones from literature. The 2006 velocity data confirm this pattern and permit further evaluations on glacier dynamics. .

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1 34 HISTORY OF THE INNOMINATA FACE them difficult but solved the problem by the most exposed, airy and exhilarating ice-climb I ever did. I reckon sixteen essentially different ways to Mont Blanc. I wish I had done them all ! NOTE ON THE ILLUSTRATIONS FIG. 1. This was taken from the inner end of Col Eccles in 1921 during the ascent of Mont Blanc by Eccles' route. Pie Eccles is seen high on the right, and the top of the Aiguille Noite de Peteret just shows over the left flank of the Pie. FIG. 2. This was taken from the lnnominata face in 1919 during a halt at 13.30 on the crest of the branch rib. The skyline shows the Aiguille Blanche de Peteret on the extreme left (a snow cap), with Punta Gugliermina at the right end of what appears to be a level summit ridge but really descends steeply. On the right of the deep gap is the Aiguille Noire de Peteret with the middle section of the Fresney glacier below it. The snow-sprinkled rock mass in the right lower corner is Pie Eccles a bird's eye view. FIG. 3. This was taken at the same time as Fig. 2, with which it joins. Pie Eccles is again seen, in the left lower corner. To the right of it, in the middle of the view, is a n ear part of the branch rib, and above that is seen a bird's view of the Punta lnnominata with the Aiguille Joseph Croux further off to the left.
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