1. Institute of General Mechanics; RWTH Aachen University; 52062 Aachen Templergraben 64 Germany
2. Vienna Doctoral Programme on Water Resource Systems; Vienna University of Technology; 1040 Vienna Karlsplatz 13/222 Austria
3. Center for Mechanics and Structural Dynamics; Vienna University of Technology; 1040 Vienna Karlsplatz 13/206 Austria