1. Professor, Dept. of Water Resources and Environmental Engineering, Tamkang Univ., Taipei, Taiwan, 251, Republic of China.
2. Associate Professor, Dept. of Hydraulics and Ocean Engineering, National Cheng-Kung Univ., Tainan, Taiwan, 701, Republic of China.
3. Former Graduate Student, Dept. of Water Resources and Environmental Engineering, Tamkang Univ., Taipei, Taiwan, 251, Republic of China.