1. Dipartimento di Energia, Politecnico di Milano, Via Lambruschini 4a, 20156 Milano, Italy
2. Computational Earth Science Group (EES-16), Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
3. Dipartimento di Ingegneria Civile e Ambientale, Politecnico di Milano, Piazza L. Da Vinci 32, 20133 Milano, Italy
4. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, Arizona 85721, USA