1. a State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2. b College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
3. c Department of Geography, National University of Singapore, Arts Link, Kent Ridge 117570, Singapore
4. d School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, China