1. Swiss Federal Research Institute WSL; Birmensdorf Switzerland
2. Laboratory of Hydraulics, Hydrology and Glaciology VAW; ETH Zürich; Zürich Switzerland
3. Helmholz Centre Potsdam; GFZ German Research Centre for Geosciences; Potsdam Germany
4. Centre de Recherche sur l'Environnement Alpin CREALP; Sion Switzerland