1. Professor, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung, 402 Taiwan, R.O.C. (corresponding author).
2. Postdoctoral Research Fellow, Dept. of Civil Engineering, National Chung Hsing Univ., Taichung, 402 Taiwan, R.O.C.
3. Associate Professor, Dept. of Hydraulic Engineering, Feng Chia Univ., Taichung, 407 Taiwan, R.O.C.
4. Associate Research Fellow, Hydrotech Research Institute; Associate Professor, Dept. of Bioenvironmental Systems Engineering, National Taiwan Univ., Taipei, 106 Taiwan, R.O.C.