1. Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education, Faculty of Geographical ScienceBeijing Normal University Beijing China
2. State Key Laboratory of Earth Surface Processes and Resource EcologyBeijing Normal University Beijing China
3. IIHR—Hydroscience and EngineeringThe University of Iowa Iowa City IA USA
4. Department of Agricultural and Biosystems EngineeringIowa State University Ames IA USA