1. Research Fellow, China Renewable Energy Engineering Institute, Beijing 100120, PR China; State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, PR China
2. (IAHR Member), Assistant Research Fellow, State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, PR China
3. (IAHR Member), Professor, State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, PR China(author for correspondence)
4. Professor, Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA
5. Research Fellow, China Three Gorges Corporation, Beijing 100038, PR China