1. Institute of Earth Surface Dynamics; University of Lausanne; Lausanne Switzerland
2. UMR CARRTEL; INRA-University Savoie Mont Blanc; Thonon les Bains France
3. SEGULA Technologies; Le Bourget du Lac; France
4. Department of Surface Waters Research and Management; Eawag-Swiss Federal Institute of Aquatic Science and Technology; Kastanienbaum Switzerland