1. Research Fellow, Geoenvironmental Research Centre, Cardiff School of Engineering, Cardiff Univ., Cardiff, UK (corresponding author).
2. Lecturer, Geoenvironmental Research Centre, Cardiff School of Engineering, Cardiff Univ., Cardiff, UK.
3. Professor and Director, Geoenvironmental Research Centre, Cardiff School of Engineering, Cardiff Univ., Cardiff, UK.
4. Lecturer, Computer Science, Cardiff Univ., Cardiff, UK.
5. Professor, Dept. of Computer Science and Centre for Computational Sciences, Mississippi State Univ., Starkville, MS 39759.