1. Member, ASCE
2. Prof., Ctr. for Envir. Engrg. Res., Dept. of Civ. Engrg., Univ. of Hong Kong, Pokfulam Rd., Hong Kong (corresponding author).
3. Res. Fellow., Ctr. for Envir. Engrg. Res., Dept. of Civ. Engrg., Univ. of Hong Kong, Pokfulam Rd., Hong Kong.