| Simulation and estimation of impact from climatic changes on irrigation water requirement in Shiyang River Basin |
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| DOI：10.7606/j.issn.1000-7601.2016.01.32 |
| Key Words: climatic change net irrigation water requirement Shiyang River Basin SDSM |
| Author Name | Affiliation | | NIU Ji-ping | College of Water Resources & Civil Engineering, Northwest A＆F University, Yangling, Shaanxi 712100, China
College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China | | SU Xiao-ling | College of Water Resources & Civil Engineering, Northwest A＆F University, Yangling, Shaanxi 712100, China | | TANG Ze-jun | College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China |
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| Abstract: |
| Upon the simulation and estimation of the impact from climatic changes on net irrigation requirement quota of crop, irrigation water requirement (IN) and total crop water demand (Wt) in Shiyang River Basin could provide support for efficient use of water resources and sustainable development of agriculture. While daily ET0 and precipitation in 2020 s, 2050 s and 2080 s were downscaled from HadCM3 (Hadley centre Coupled Model, version 3) outputs under A2 and B2 emission scenarios by SDSM (Statistical Downscaling Model), based on meteorological data from 11 meteorological stations located in and around the Shiyang River Basin during 1951—2012. Net irrigation requirement quota, IN and Wt were calculated by using crop coefficient method, and removing the effective rainfall. The spatial distribution of net irrigation requirement quota was investigated by Inverse Distance Weighted Interpolation. The results showed that net irrigation requirement quota performed an increasing tendency from southwest to northeast gradient for wheat, maize, sweet pepper, cotton, sesame and apple. HadCM3 projected an increasing trend for these six typical crops. The present IN and Wt were 12.65×108 m3 and 15.42×108 m3, respectively in the whole basin. When the present planting structure was maintained, under A2 emission scenario, the IN were 13.45×108 m3, 15.02×108 m3, and 16.94×108 m3, and the Wt were 15.53×108 m3, 16.65×108 m3, and 18.18×108 m3, respectively in 2020 s, 2050 s and 2080 s. Under B2 emission scenario, the IN were 13.55×108 m3, 14.63×108 m3, and 15.51×108 m3, and the Wt were 15.56×108 m3, 16.34×108 m3, and 17.00×108 m3 respectively in 2020 s, 2050 s and 2080 s. A remarkable increasing temporal trend was observed in net irrigation water requirement, IN and Wt. The increase under B2 scenario was lower than that under A2 scenario. There would be a significant increasing trend about requirement of irrigation water in the future, which would especially be more significant after the 2050 s. |
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