1. Professor, Dept. of Hydraulic Engineering, Tsinghua Univ., Key Laboratory of Water and Sediment Sciences, MOE, Beijing 100084, China.
2. M.E. Candidate, Dept. of Hydraulic Engineering, Tsinghua Univ., Key Laboratory of Water and Sediment Sciences, MOE, Beijing 100084, China.
3. Research, Beijing Institute of Hydraulic Research, Beijing 100044, China.