1. Associate Professor, School of Civil, Urban, and Geosystem Engineering, Seoul National Univ., San 56-1 Shillim-dong Gwanak-gu, Seoul 151-742, Korea (corresponding author). E-mail: yokim05@snu.ac.kr
2. Ph.D. Student, School of Civil, Urban and Geosystem Engineering, Seoul National Univ., San 56-1 Shillim-dong Gwanak-gu, Seoul 151-742, Korea.
3. School of Civil, Urban and Geosystem Engineering, Seoul National Univ., San 56-1 Shillim-dong Gwanak-gu, Seoul 151-742, Korea; formerly, Masters Student.
4. Director, Hydrosystem Engineering Center, Korea Institute of Water and Environment, Jeonmin-dong, Useong-gu, Daejeon 305-730, Korea.