1. Postdoctoral Research Fellow, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, P.R. China; currently, Associate Professor, School of Civil Engineering, Beijing Polytechnic Univ., Beijing 100022, P.R. China.
2. Professor, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, P.R. China.
3. Postgraduate Research Assistant, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, P.R. China.
4. Doctoral Research Assistant, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, P.R. China.