1. Deceased December 2000; formerly, Research Associate, Dept. of Civil Engineering, Kyoto Univ., Yoshida, Sakyo-Ku, Kyoto 606-8501, Japan.
2. Professor, Dept. of Civil Engineering, Kyoto Univ., Yoshida, Sakyo-Ku, Kyoto 606-8501, Japan.
3. Research Engineer, IIHR–Hydroscience & Engineering; formerly, Iowa Institute of Hydraulic Research; and Adjunct Professor, Dept. of Civil and Environmental Engineering, Univ. of Iowa, Iowa City, IA 52242.
4. Professor Emeritus, Kyoto Univ.; Research Institute of Osaka, Foundation of River and Watershed Environment Management, 1-6-4 Ohtemae, Chuo-Ku, Osaka 540-0008, Japan.