1. PHD student, Lecturer, Department of Civil and Environmental Engineering, Portland State University, Portland, OR, USA
2. Department of Environmental Engineering, University of Babylon, Babylon, Iraq
3. Professor, Department of Civil and Environmental Engineering, Portland State University, Portland, OR, USA
4. Collaborative Center for Geo-hazards and Eco-Environment in Three Gorges Area, Three Gorges University, Yichang, PR China.