1. Research Assistant, Institute of Water Saving Agriculture in Arid Regions of China, Northwest A&F Univ., No. 3, Taicheng Rd., Yangling, Shaanxi 712100, China (corresponding author).
2. Professor, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, No. 1, Yuyuantan South Rd., Haidian District, Beijing 100038, China.
3. Associate Professor, College of Water Conservancy and Hydropower, Hebei Univ. of Engineering, Guangming South St. 199, Handan, Hebei 056038, China.
4. Master Degree Candidate, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, No. 1, Yuyuantan South Rd., Haidian District, Beijing 100038, China.