1. Head and Prof., Div. of Envir. and Water Resour. Engrg., School of Civ. and Struct. Engrg., Block N1 #1A-29, Nanyang Technol. Univ., Nanyang Ave., Singapore 639798.
2. Proj. Offcr., Div. of Envir. and Water Resour. Engrg., School of Civ. and Struct. Engrg., Block N1 #1A-29, Nanyang Technol. Univ., Nanyang Ave., Singapore 639798.
3. Asst. Prof., Div. of Envir. and Water Resour. Engrg., School of Civ. and Struct. Engrg., Block N1 #1A-29, Nanyang Technol. Univ., Nanyang Ave., Singapore 639798.