1. Research Civil Engineer (former graduate student at Mississippi State Univ.), U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180, US, (Corresponding author), e-mail: william.d.carruth@usace.army.mil
2. Ph.D., Associate Professor, Civil and Environmental Engineering, Mississippi State Univ., 501 Hardy Rd. 235 Walker Hall, Mississippi State, MS 39762, US, e-mail: ilhoward@cee.msstate.edu