1. Institute for Fluid Dynamics and Ship Theory, Hamburg University of Technology 1 , Am Schwarzenberg-Campus 4, D-21075 Hamburg, Germany
2. Institute of Coastal Ocean Dynamics 2 , Helmholtz-Zentrum Hereon, Max-Planck-Straße 1, D-21502 Geesthacht, Germany
3. Modeling, Simulation and Optimization of Complex Systems, Universität Koblenz-Landau 3 , Universitätsstraße 1, D-56070 Koblenz, Germany
4. School of Marine Science and Policy, University of Delaware 4 , Newark, Delaware 19716, USA