1. Project Manager, IUB Engineering AG, Technoparkstrasse 1, CH-8005 Zürich, Switzerland; formerly, Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, CH-8093 Zürich, Switzerland (corresponding author).
2. Research Engineer, Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, CH-8093 Zürich, Switzerland.
3. Professor and Director, Laboratory of Hydraulics, Hydrology and Glaciology (VAW), ETH Zurich, CH-8093 Zürich, Switzerland.