1 Department of Water, Atmosphere and Environment, Institute of Water Management, Hydrology and Hydraulic Engineering, BOKU, University of Natural Resources and Applied Life Sciences Vienna, Vienna, Austria. martin.guzelj@yahoo.de.
2 Christian Doppler Laboratory for Sediment Research and Management, Institute of Water Management, Hydrology and Hydraulic Engineering, BOKU, University of Natural Resources and Applied Life Sciences Vienna, Vienna, Austria.
3 Institute of Geography and Geoecology, Karlsruhe Institute of Technology, Karlsruhe, Germany.