1. Professor of Research and Development Initiative, Chuo Univ., 1-13-27 Bunkyo-ku, Kasuga, Tokyo 112-8551, Japan (corresponding author).
2. Professor of Research and Development Initiative, Chuo Univ., 1-13-27 Bunkyo-ku, Kasuga, Tokyo 112-8551, Japan.
3. Professor and Henry Goodrich Chair of Excellence in Civil and Environmental Engineering, Director of the Hydraulics and Sedimentation Lab, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 851 Neyland Dr., Knoxville, TN 37996-2313.
4. Postdoctoral Research Associate, Hydraulics and Sedimentation Lab, Dept. of Civil and Environmental Engineering, Univ. of Tennessee, 851 Neyland Dr., Knoxville, TN 37996-2313.