[1] Delft Univ Technol, Fac Civil Engn & Geosci, Environm Fluid Mech Sect, NL-2600 GA Delft, Netherlands
[2] Univ Catholique Louvain, G Lemaitre Inst Astron & Geophys, B-1348 Louvain, Belgium
[3] Univ Catholique Louvain, Ctr Syst Engn & Appl Mech, B-1348 Louvain, Belgium