1. Research Fellow, DHI-NTU Centre, Nanyang Technological Univ., N1.2-B1-02, 50 Nanyang Ave., Singapore 639798; Associate Research Fellow, Taiwan Typhoon and Flood Research Institute, Taichung 40763, Taiwan.
2. Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., N1-01a-27, 50 Nanyang Ave., Singapore 639798 (corresponding author).
3. Associate Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., N1-01a-27, 50 Nanyang Ave., Singapore 639798.