1. SJE Ecohydraulic Engineering GmbH, Viereichenweg 12, Stuttgart 70569, Germany
2. Centre for Biorobotics, Tallinn University of Technology, Akadeemia tee 15A-111, Tallinn 12618, Estonia
3. Department of Signal Processing, Tampere University of Technology, P.O. Box 553, Tampere FI-33101, Finland
4. Institute of Water and River Basin Management, Karlsruhe Institute of Technology, Kaiserstraße 12, Karlsruhe 76131, Germany
5. Institute for Modelling Hydraulic and Environmental Systems, University of Stuttgart, Pfaffenwaldring 61, Stuttgart 70569, Germany