1. College of Water Resources, North China University of Water Resources and Electric Power, Zhengzhou 450001, China
2. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, UK
3. Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
4. School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China
5. LEHNA - Laboratoire d’Ecologie des Hydrosystemes Naturels et Anthropises, University of Lyon, 69622 Villeurbanne, France