1. Research Fellow, Research Group of Hydraulics in Environmental and Civil Engineering, Univ. of Liege, Allée de la Découverte 9, B-4000 Liège, Belgium (corresponding author).
2. Professor, Research Group of Hydraulics in Environmental and Civil Engineering, Univ. of Liege, Allée de la Découverte 9, B-4000 Liège, Belgium.
3. Research Associate, Research Group of Hydraulics in Environmental and Civil Engineering, Univ. of Liege, Allée de la Découverte 9, B-4000 Liège, Belgium.
4. Associate Professor, Research Group of Hydraulics in Environmental and Civil Engineering, Univ. of Liege, Allée de la Découverte 9, B-4000 Liège, Belgium.