1. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, P.R. China
2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong P.R. China
3. Brook Byers Institute of Sustainable Systems and School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States