1. Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore(author for correspondence)
2. EDF, LNHE and Saint-Venant Laboratory for Hydraulics, 6 quai Watier, 78400 Chatou, France
3. Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore
4. EDF, CIH, La Motte-Servolex, France