1. Assistant Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., 50 Nanyang Ave., Singapore 639798, Singapore (corresponding author).
2. Professor, Faculty of Engineering, Univ. of Regina, Regina, Saskatchewan S4S 0A2, Canada; and Chinese Research Academy of Environmental Science, Beijing Normal Univ., Beijing 100012–100875, China.
3. Ph.D. Student, Faculty of Engineering, Univ. of Regina, Regina, Saskatchewan S4S 0A2, Canada.