1. Associate Professor, Dept. of Hydraulics, Transportation and Roads, Sapienza Univ. of Rome, Via Eudossiana 18, 00184 Rome, Italy. E-mail: roberto.magini@uniroma1.it
2. Postdoctoral Fellow, Dept. of Hydraulics, Transportation and Roads, Sapienza Univ. of Rome, Via Eudossiana 18, 00184 Rome, Italy. E-mail: isabella.pallavicini@uniroma1.it
3. Full Professor, Dept. of Hydraulics, Transportation and Roads, Sapienza Univ. of Rome, Via Eudossiana 18, 00184 Rome, Italy. E-mail: roberto.guercio@uniroma1.it