1. Assistant Professor, Dept. of Civil and Environmental Engineering, Mississippi State Univ., Mississippi State, MS 39762 (corresponding author).
2. Assistant Professor, Dept. of Forest Engineering, Resources and Management, Oregon State Univ., Corvallis, OR 97331.
3. Graduate Student, Dept. of Civil and Environmental Engineering, Mississippi State Univ., Mississippi State, MS 39762.
4. Professor, Dept. of Civil and Environmental Engineering, Colorado School of Mines, Golden, CO 80401.