1. Postdoctoral Fellow, Tainan Hydraulics Laboratory, National Cheng-Kung Univ., Tainan 701, Taiwan.
2. Assistant Professor, Ocean and Coastal Division, Dept. of Civil Engineering, Texas A&M Univ., College Station, TX 77843.
3. Professor, Dept. of Hydraulics and Ocean Engineering, National Cheng Kung Univ., Tainan 701, Taiwan.
4. Professor, School of Civil and Environmental Engineering, Cornell Univ., Ithaca, NY 14850.