Shao-Yiu Hsu¹, Yi-Zhih Tsai¹, Qun-Zhan Huang¹, Ming-Liang Cheng², Wei-Cheng Lo³ and Ming-Hsu Li⁴, (1)National Taiwan University, Department of Bioenvironmental Systems Engineering, Taipei, Taiwan, (2)National Taiwan University, Department of Bioenvironmental system engineering, Taipei, Taiwan, (3)National Cheng Kung University, Department of Hydraulic and Ocean Engineering, Tainan, Taiwan, (4)National Central University, Graduate Institute of Hydrological and Oceanic Sciences, Taoyuan, Taiwan