1. Postdoctoral Fellow, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, and College of Water Conservancy and Hydropower Engineering, Hohai Univ., Nanjing, 210098, P. R. China; formerly, Associate Professor, Dept. of Civil Engineering, Shandong Univ., Jinan, 250061, P. R. China.
2. Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910; and Cheung Kong Scholar, State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai Univ., Nanjing, 210098, P. R. China (corresponding author).