1. Research Associate, National Center for Computational Hydroscience and Engineering, Univ. of Mississippi, Carrier Hall 102, University, MS 38677 (corresponding author).
2. Professor, Dept. of Civil Engineering, National Univ. of Singapore, Singapore 117576.
3. Professor and Director, National Center for Computational Hydroscience and Engineering, Univ. of Mississippi, Carrier Hall 102, University, MS 38677.