1. Lecturer, College of Water Conservancy and Civil Engineering, China Agricultural Univ., Beijing 100083, China.
2. Associate Professor, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia (corresponding author).
3. Research Scholar, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia.
4. Associate Professor, School of Civil, Mining and Environmental Engineering, Univ. of Wollongong, Wollongong, NSW 2522, Australia.