1. a Department of Civil Engineering , Texas A&M University , College Station, Texas, 77845-3136, USA
2. b Faculty of Engineering , University. of Bologna , Via del Risorgimento 2, 40136, Bologna, Italy
3. c Fugro, Hillcroft, Houston, TX, 6100, USA
4. d Department of Environmental Sciences , University of Virginia , Charlottesville, VA, 22904-4123, USA