1. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
2. The State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (SKL-WAC), China Institute of Water Resources and Hydropower Research (IWHR), Beijing 100038, China
3. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China
4. College of Water Resources, North China University of Water Resources and Electric Power, Zhengzhou 450001, China
5. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK