1. Professor, State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
2. Professor, Department of Geography and Earth Sciences, University of Malawi, Chancellor College, P.O. Box 280, Zomba, Malawi
3. Emeritus Professor, Department of Geosciences, University of Oslo, P.O. Box 1047 Blindern, N-0316 Oslo, Norway