Yu Ye, Hohai University, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing, China, Gabriele Chiogna, Technical University of Munich, Arcistrasse 21, Faculty of Civil, Geo and Environmental Engineering, 80333 Munich, Germany; University of Innsbruck, Innrain 52, Institute of Geography, 6020 Innsbruck, Austria, Chunhui Lu, Hohai University, Nanjing, China and Massimo Rolle, Technical University of Denmark, Kgs. Lyngby, Denmark