1. Associate Professor, College of Water Conservancy and Hydropower Engineering, Hohai Univ., Nanjing 210098, China (corresponding author).
2. Postgraduate Student, College of Water Conservancy and Hydropower Engineering, Hohai Univ., Nanjing 210098, China.
3. Professor, Institute of Applied Mechanics, Graz Univ. of Technology, 8010 Graz, Austria.
4. Assistant Engineer, Dept. of Hydraulic Engineer, Hunan Hydro and Power Design Institute, Changsha 410021, China.