1. Postdoctor, State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin Univ., Tianjin 300350, P.R. China.
2. Professor, Key Laboratory of Coast Civil Structure Safety of China Ministry of Education, School of Civil Engineering, Tianjin Univ., Tianjin 300350, P.R. China (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Surrey, Guildford, Surrey GU2 5XH, U.K.
4. Ph.D Candidate, School of Civil Engineering, Tianjin Univ., Tianjin 300350, P.R. China.