1. Associate Professor, Dept. of Engineering Univ. of Sannio, Piazza Roma 21, 82100 Benevento, Italy.
2. Full Professor, Dept. of Hydraulic, Geotechnical and Environmental Engineering, Univ. of Naples Federico II, Via Claudio 21, 80125 Naples, Italy (corresponding author).
3. Ph.D. Engineer, Centre of Environmental Research C.I.R.AM., Univ. of Naples Federico II, Via Mezzocannone 16, 80134 Naples, Italy.