1. Department of Geography, Environment and Tourism Western Michigan University Kalamazoo Michigan USA
2. Center for Dryland Water Resources Research and Watershed Science, Key Laboratory of West China's Environmental System (Ministry of Education) College of Earth and Environmental Sciences, Lanzhou University Lanzhou China
3. Department of Geography University of Tennessee Knoxville Tennessee USA
4. water@leeds, School of Geography University of Leeds Leeds UK
5. water@leeds, School of Politics and International Studies University of Leeds Leeds UK