1. School of Management and Economics, North China University of Water Resources and Electric Power, Zhengzhou, China
2. Department of Civil and Architectural Engineering, University of Wyoming, Laramie, Wyoming, USA
3. Department of Construction Engineering and Management, North China University of Water Resources and Electric Power, Zhengzhou, China
4. Henan Key Laboratory of Water Environment Simulation and Treatment, Zhengzhou, China
5. School of Mathematics and Statistics, North China University of Water Resources and Electric Power, Zhengzhou, China