1. Professor and Director, Institute of Hydraulic Research, Tianjin Univ., Tianjin 300072, China.
2. Senior Lecturer, Dept. of Aerospace, Civil and Mechanical Engineering, Univ. of Hertfordshire, Hatfield, Herts AL10 9AB, U.K.
3. Professor, Dept. of Civil and Environmental Systems Engineering, Ritsumeikan Univ., Kusatsu, Shiga 525-8577, Japan.