1. Department of Geosciences; University of Padova; Via Gradenigo, 6 I-35131 Padova Italy
2. IMAGE and International Centre for Hydrology ‘Dino Tonini’; University of Padova; Via Loredan, 20 I-35131 Padova Italy
3. Nicholas School of the Environment; and Department of Civil and Environmental Engineering; Duke University; Durham North Carolina USA