1. Asst. Prof., Dept. of Civ. Engrg., Indian Inst. of Technol., Kharagpur 721302, West Bengal, India. E-mail: sdey@civil.iitkgp.ernet.in; currently, Visiting Prof., Institut für Wasserbau, Universität Stuttgart, Pfaffenwaldring 61, D-7055, Stuttgart, Germany.
2. Lect., Dept. of Appl. Mech. and Drawing, Bengal Engrg. College, Howrah 711103, West Bengal, India. E-mail: appmech@becs.ernet.in