1. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, P. R. China
2. School of Civil Engineering, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China
3. Henan Provincial Communications Planning & Design Institute Co. Ltd., Zhengzhou 450002, P. R. China
4. School of Civil Engineering, Zhengzhou University, Zhengzhou 450002, P. R. China