Sung Hi Choi, Chungnam National University, Daejeon, Korea, Republic of (South), Ji-In Kim, Chungnam National University, Astronomy, Space Science and Geology, Daejeon, South Korea, Giwon Koh, Department of Water Industry Promotion, Jeju Special Self-Governing Province Institute of Environment Research, Jeju, South Korea, Jun Beom Park, US Army Corps of Engineers Far East District, Seoul, South Korea and Jong-Sik Ryu, Pukyong National University, Department of Earth and Environmental Sciences, Busan, South Korea