Seite - 584 - in Book of Full Papers - Symposium Hydro Engineering

Fig. 2 Identified glacier blocks and their pathways to the lagoon and corresponding volumes (representative blocks for further investigation marked red) Blocs glaciaires identifiés, leurs voies vers la lagune et les volumes correspondants (blocs représentatifs pour une enquête plus approfondie marqués en rouge) At the base of the valley propagation of quaternary deposits of morainic origin and some colluvial deposits of little thickness are found. The catchment area is 17.78 km2 of which 11.26 km2 (63% of the total surface) are snow /ice covered. The average annual precipitation (snow and rain) in the basin is 1070.5 mm/year – high flow season is between December and March. Fig. 3 Sliding paths of the different identified glacier blocks (left) and their slope distribution compared with findings from [9] (grey bars) (right) Les chemins de glissement des différents blocs glaciaires identifiés (à gauche) et leur distribution de pente par rapport aux résultats de [8] (barres grises) (à droite) The average annual mean flow rate is 0.87 m3/s with a mean annual yield of 18.0 x 106 m3. In general, the climate in the area of the lagoon is very cold with a very dry atmosphere, but with alternating temperatures during day and night. From June to September the average temperature at the lagoon (4’290 m asl) is below 4°C and the average annual minimum temperature is 0.07°C. July is 584