1. Senior Researcher, International Hydraulic Research Center, Rural Research Institute, Korea Rural Community Corporation, 870 Haean-ro, Sangnok-gu, Ansan 15634, Republic of Korea.
2. Professor, Dept. of Civil and Environmental Engineering, Sejong Univ., 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of Korea (corresponding author).
3. Associate Professor, Dept. of Civil and Environmental Engineering, Seoul National Univ., 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.