1. Assoc. Prof., Dept. of Hydr., Maritime, and Geotech. Engrg., Univ. of Padova, Via Ognissanti 39, 35129 Padova, Italy. E-mail: simonini@ geomar.ing.unipd.it
2. Res. Fellow, Dept. of Hydr., Maritime, and Geotech. Engrg., Univ. of Padova, Via Ognissanti 39, 35129 Padova, Italy.