1. Senior Research Scientist, Dynaflow, Inc., 10621-J Iron Bridge Rd., Jessup, MD 20794 (corresponding author).
2. Associate Professor, Dept. of Civil Engineering, Univ. of Mississippi, University Ave., Oxford, MS 38677-1848.
3. Professor and Dean of School of Engineering, Dept. of Civil Engineering, Univ. of Mississippi, University Ave., Oxford, MS 38677-1848.