1. School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore, 639798 (corresponding author).
2. School of Civil and Environmental Engineering, Nanyang Technological Univ., Nanyang Ave., Singapore, 639798.
3. Maritime Research Centre and Nanyang Environment and Water Research Institute, Nanyang Technological Univ., Nanyang Ave., Singapore, 639798.
4. School of Engineering, Design and Technology, Univ. of Bradford, West Yorkshire, BD7 1DP, United Kingdom.