Quantitative effects of changes in agricultural irrigation on potential evaporation
Congying Han
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing, China
Search for more papers by this authorCorresponding Author
Baozhong Zhang
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing, China
Correspondence
Baozhong Zhang, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Email: [email protected]
Search for more papers by this authorSongjun Han
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing, China
Search for more papers by this authorCongying Han
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing, China
Search for more papers by this authorCorresponding Author
Baozhong Zhang
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing, China
Correspondence
Baozhong Zhang, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
Email: [email protected]
Search for more papers by this authorSongjun Han
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China
National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing, China
Search for more papers by this authorAbstract
Evaporation is a key element to the basin's water cycle. Agricultural irrigation has resulted in a significant variation of regional potential evaporation (Epen). The spatiotemporal variation of Epen and influencing factors in natural, agricultural, and desert areas in different developmental stages of irrigation in Heihe River Basin (HRB) from 1970 to 2017 were comparatively analysed in this study. This work focused on the correction effect of irrigation on the variation of Epen. Agricultural water consumption in HRB significantly varied around 1998 due to agricultural development and water policy. Under the influence of irrigation, annual variations of Epen in agricultural, natural, and desert areas were significantly different. From 1970 to 1998, the annual trend slope of Epen in natural area only reduced by 1 mm decade−1, while that in agricultural area significantly decreased by 39 mm decade−1. After the implementation of water-saving irrigation, Epen in natural and agricultural areas increased by 11 and 54 mm decade−1, respectively, from 1998 to 2017. In contrast with natural and agricultural areas, Epen in desert area decreased by 80 mm decade−1 from 1970 to 1998 and continuously decreased by 41 mm decade−1 from 1998 to 2017. However, the regulatory effect of irrigation on Epen in desert area started to manifest due to the expansion of cultivated land area from 2010 to 2017. Irrigation had a significant regulatory effect on the variation of Epen in HRB. The regulatory effect was mainly reflected on the aerodynamic term (Eaero). Results indicated that the main meteorological factors influencing Epen in each region were wind speed, which is 2 m above the surface (U2), and water vapour deficit (VPD).
Open Research
DATA AVAILABILITY STATEMENT
Research data are not shared.
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