1. Assistant Professor, Dept. of Environmental and Civil Engineering, Florida Gulf Coast Univ., 10501 FGCU Blvd. South, Fort Myers, FL 33965.
2. Ph.D. Student, Dept. of Civil and Environmental Engineering, Duke Univ., Box 90287, Durham, NC 27708-0287.
3. Ph.D. Candidate, Dept. of Civil and Environmental Engineering, Duke Univ., Box 90287, Durham, NC 27708-0287.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Duke Univ., Box 90287, Durham, NC 27708-0287 (corresponding author).