Yu Zhang, Tsinghua University, State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Beijing, China, Leonora King, Kwantlen Polytechnic University, Geography and the Environment, Surrey, Canada, Marwan A Hassan, Univ British Columbia, Vancouver, BC, Canada, Xudong Fu, Tsinghua University, Department of Hydraulic Engineering, Beijing, China and Erkan Istanbulluoglu, University of Washington, Civil and Environmental Engineering, Seattle, WA, United States