1. Graduate Student and Research Assistant, Research Center of Water Engineering Safety and Disaster Prevention, Northwest A&F Univ., Yangling, Shaanxi, People’s Republic of China.
2. Professor and Director, Research Center of Water Engineering Safety and Disaster Prevention, Northwest A&F Univ., Yangling, Shaanxi, People’s Republic of China.
3. Associate Professor, Dept. of Civil Engineering, Auburn Univ., Auburn, AL 36849-5337 (corresponding author).