1. Professor, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung 402, Taiwan (corresponding author).
2. Postdoctoral Research Fellow, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung 402, Taiwan.
3. Master's Graduate, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung 402, Taiwan; formerly, M.Eng. Candidate, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung 402, Taiwan.
4. Associate Professor, Graduate Institute of Hydrological and Oceanic Sciences, National Central Univ., Taoyuan 320, Taiwan.
5. Professor, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung 402, Taiwan.