1. Ph.D. Student, College of Engineering, Ocean Univ. of China, Qingdao 266100, China.
2. Reader, School of Engineering, Univ. of Aberdeen, Aberdeen AB24 3UE, U.K. (corresponding author).
3. Professor, College of Engineering, Ocean Univ. of China, Qingdao 266100, China.
4. Professor, College of Civil Engineering, Tongji Univ., Shanghai 20092, China.
5. Professor, State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan Univ., Chengdu 610065, China.