1. Professor, Dept. of Civil Engineering, Univ. of Calgary, Alberta, Canada T2N 1N4.
2. Research Professor, Unité de Recherche Erosion Torrentielle Neige et Avalanches, Cemagref, BP 76 F38402 Saint Martin d’Hères Cedex, France.
3. Professor, Laboratoire Sols Solides Structures, UJF-INP-CNRS, BP 53 F38041 Grenoble, France.