1. Professor, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Univ., Chengdu 610064, P. R. China; and Uncertainty Decision-Making Laboratory, Sichuan Univ., Chengdu 610064, P. R. China (corresponding author).
2. Ph.D. candidate, Uncertainty Decision-Making Laboratory, Sichuan Univ., Chengdu 610064, P. R. China.
3. Senior Engineer, Ertan Hydropower Development Company, Ltd., Chengdu 610051, P. R. China.