1. Professor, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Univ., Chengdu 610064, P.R. China; Uncertainty Decision-Making Laboratory, Sichuan Univ., Chengdu 610064, P.R. China (corresponding author).
2. Master Candidate, Uncertainty Decision-Making Laboratory, Sichuan Univ., Chengdu 610064, P.R. China.
3. Lecturer, Uncertainty Decision-Making Laboratory, Sichuan Univ., Chengdu 610064, P.R. China.
4. Postdoctoral Fellow, Uncertainty Decision-Making Laboratory, Sichuan Univ., Chengdu 610064, P.R. China; Dept. of Civil and Environmental Engineering, Univ. of Washington, P.O. Box 352700, Seattle, WA 98195-2700.