1. Professor, Dept. of Civil Engineering, National Central Univ., 300 Jhong-Da Rd., Jhong-Li, Taoyuan, Taiwan 32001, ROC (corresponding author).
2. Master of Science, Dept. of Civil Engineering, National Central Univ., 300 Jhong-Da Rd., Jhong-Li, Taoyuan, Taiwan 32001, ROC.
3. Associate Professor, Institute of Hydrological and Oceanic Sciences, National Central Univ., 300 Jhong-Da Rd., Jhong-Li, Taoyuan, Taiwan 32001, ROC.
4. Professor, Dept. of Civil Engineering, National Central Univ., 300 Jhong-Da Rd., Jhong-Li, Taoyuan, Taiwan 32001, ROC.