1. Senior Lecturer, Dept. of Engineering, Univ. of Aberdeen, Aberdeen AB24 3UE, U.K. (corresponding author).
2. Professor, Dept. of Engineering Mechanics, Kunming Univ. of Science and Technology, Kunming 650051, Yunnan, China.
3. Professor, State Key Laboratory of Coastal and Offshore Engineering, Dalian Univ. of Technology, Dalian 116023, China.
4. Ph.D. Student, Dept. of Engineering, Univ. of Aberdeen, Aberdeen AB24 3UE, U.K.