1. Lecturer, Dept. of Environmental Engineering, Democritus Univ. of Thrace, GR-76100 Xanthi, Greece; formerly Postdoctoral Research Associate, Dept. of Civil Engineering, Univ. of Patras, GR-26500 Patras, Greece.
2. Professor, Dept. of Civil Engineering, Univ. of Patras, GR-26500 Patras, Greece (corresponding author). E-mail: d.e.beskos@upatras.gr