1. Huadian Electric Power Research Institute Company Limited, Hangzhou, Zhejiang 310000, China
2. Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China
3. College of Water Resources and Architectural Engineering, Northwest A & F University, Yangling, Shaanxi 712100, China