1. Ph.D. Student, Hydraulics Laboratory, Dept. of Civil Engineering, Ghent Univ., St-Pietersnieuwstraat 41 B5, B-9000 Ghent, Belgium (corresponding author).
2. Ph.D. Student, Hydraulics Laboratory, Dept. of Civil Engineering, Ghent Univ., St-Pietersnieuwstraat 41 B5, B-9000 Ghent, Belgium.
3. Associate Professor, Hydraulics Laboratory, Dept. of Civil Engineering, Ghent Univ., St-Pietersnieuwstraat 41 B5, B-9000 Ghent, Belgium.