1. Professor, College of Water Conservancy and Hydropower Engineering, Hohai Univ., Nanjing 210098, China; Experimental Teaching Center of Water Conservancy Projects, Hohai Univ., Nanjing 210098, China (corresponding author).
2. Postgraduate Student, College of Water Conservancy and Hydropower Engineering, Hohai Univ., Nanjing 210098, China.
3. Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27695-7908.