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, China Three Gorges Corporation, No.1 Jianshe Rd., Xiba District, Yichang 443002, P.R. China.