1. Professor, Dept. of Civil Engineering, Hydraulics Laboratory, Leuven Univ., Kasteelpark Arenberg 40, B-3001, Leuven, Belgium.
2. Consulting Engineer, I.M.D.C., Consulting Engineers, Wilrijkstraat 37-45, B-2140 Antwerp, Belgium.
3. Research Engineer, Dept. of Civil Engineering, Hydraulics Laboratory, Leuven Univ., Kasteelpark Arenberg 40, B-3001, Leuven, Belgium.