1. (IAHR Member), Researcher, Irstea, HHLY, Hydrology-Hydraulics Research Unit, 5 rue de la Doua, CS 70077, 69626 Villeurbanne cedex, France
2. Researcher, Cefas, Lowestoft Laboratory, Pakefield Road, Lowestoft, NR33 0HT, United Kingdom
3. (IAHR Member), Researcher, Irstea, HHLY, Hydrology-Hydraulics Research Unit, 5 rue de la Doua, CS 70077, 69626 Villeurbanne cedex, France