1. Ph.D. Candidate, Faculty of Water Conservancy Engineering, North China Institute of Water Conservancy and Hydroelectric Power, Zheng Zhou, Henan 450011, China (corresponding author).
2. Professor, Faculty of Environmental and Municipal Engineering, North China Univ. of Water Resources and Electric Power, Zheng Zhou, Henan 450011, China.
3. Professor, Faculty of Infrastructure Engineering, Dalian Univ. of Technology, Dalian, Liaoning 116024, China.