1. Ph.D. Student, Irstea, UR HBAN, 1 Rue Pierre-Gilles de Gennes, 92761 Antony, France; formerly, Irstea, UMR G-EAU, 361 rue Jean-François Breton, BP 5095, 34196 Montpellier Cedex 5, France (corresponding author).
2. Research Associate, Irstea, UMR G-EAU, 361 Rue Jean-François Breton, BP 5095, 34196 Montpellier Cedex 5, France.
3. Research Engineer, Irstea, UMR G-EAU, 361 Rue Jean-François Breton, BP 5095, 34196 Montpellier Cedex 5, France.
4. Research Associate, Dept. of Civil Engineering, Univ. of Bristol, University Walk, Bristol BS8 1TR, U.K.
5. Deceased February 8, 2015; formerly, Associate Professor, Delft Univ. of Technology, Faculty of Civil engineering and Geoscience, Stevinweg 1, 2628 CN Delft, Netherlands.