1. a Department of Hydraulic, Environmental, Infrastructures and Surveying Engineering (D.I.I.A.R.) , Politecnico di Milano (POLIMI) , Piazza Leonardo da Vinci 32, 20133, Milano, Italy
2. b Department of Hydraulic, Environmental, Infrastructures and Surveying Engineering (D.I.I.A.R.) , Politecnico di Milano (POLIMI) , Piazza Leonardo da Vinci 32, 20133, Milano, Italy E-mail:
3. c Laboratory of Hydraulic Constructions (LCH) , Ecole Polytechnique Fédérale de Lausanne (EPFL) , Station 18, 1015, Lausanne, Switzerland E-mail: