1. Postdoctoral Fellow, Dept. of River and Harbor Engineering, National Taiwan Ocean Univ., Keelung 202, Taiwan 20224, ROC.
2. Graduate Student, Dept. of River and Harbor Engineering, National Taiwan Ocean Univ., Keelung 202, Taiwan 20224, ROC.
3. Professor, Dept. of River and Harbor Engineering, National Taiwan Ocean Univ., Keelung 202, Taiwan 20224, ROC (corresponding author).