1. Institute of Water Resource and Hydropower ResearchNorth A&F UniversityShaanxiYangling712100People's Republic of China
2. Key Laboratory of Agriculture Soil and Water Engineering in Arid and Semiarid AreasMinistry of EducationNorth A&F UniversityShaanxiYangling712100People's Republic of China
3. Department of Energy SystemsSINTEF Energy ResearchTrondheimNorway