1. a Department of Civil Engineering , Micron Engineering Center, Boise State University , Room 403A, 1910 University Drive, Boise, ID, 83725-2075, USA
2. b Department of Civil and Environmental Engineering , The Hong Kong University of Science and Technology , Room 3569, Clear Water Bay, Kowloon, Hong Kong SAR, People's Republic of China E-mail:
3. c V.T. Chow Hydrosystems Laboratory, Department of Civil and Environmental Engineering , University of Illinois at Urbana-Champaign , 2535a Hydrosystems Laboratory, MC-250. 205 North Mathews Avenue, Urbana, IL, 61801, USA E-mail:
4. d V.T. Chow Hydrosystems Laboratory, Department of Civil and Environmental Engineering , University of Illinois at Urbana-Champaign , 2535b Hydrosystems Laboratory, MC-250. 205 North Mathews Avenue, Urbana, IL, 61801, USA E-mail: