1. Department of Geology, UAE University, Al Ain, UAE
2. College of Water Resources and Hydrology, Hohai University, Nanjing, China
3. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, China, and College of Water Resources and Hydrology, Hohai University, Nanjing, China
4. 4College of Water Resources and Hydrology, Hohai University, Nanjing, China
5. Department of Geology, UAE University, Al Ain, UAEl X. L. Hou, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, Roskilde, Denmark, and Xi'an AMS centre and SKLLQG Institute of Earth Environment, CAS, Xi'an, China