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| DOI：10.13522/j.cnki.ggps.2019478 |
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| Variation in Water Diverted to the Qingtongxia Irrigation District and Its Determinants |
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LIU Kuan, ZHAI Jiaqi, ZHAO Yong, DONG Yiyang, LI Haihong
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1.State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; 2. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
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| Abstract: |
| 【Objective】Agricultural production in Qingtongxia irrigation district relies on water diverted from the Yellow river, which depends on many factors. In this paper, we analyzes its trend over the past two decades as well as the determinants underlying the trend.【Method】The analysis was based on data measured from 1998-2017, and the temporal trend in the diverted water for the whole district and the sub-irrigation districts was calculated using the tendency estimation method. The correlation between the diverted water, water availability, demand of irrigation for water, and irrigation efficiency was analyzed using the Pearson correlation coefficient method.【Result】①The water diverted to Qingtongxia irrigation district, Yinchuan irrigation district, Yinnan irrigation district and Yinbei irrigation district had trended down at rate of 1 330, 570, 520 and 250 million m3 per decade respectively. Intra-annual water diversion was mainly from May to August for summer irrigation, and from October to November for winter irrigation. ②Although the water used by per unit area had trended down in general, there was a spatiotemporal variation across the region. In 1998—2002, water used per unit area for irrigation was the highest in the center followed by the south in the region, whereas the lowest was in the north. While the north still used least water per unit area in 2013—2017, the area that consumed most per unit area had shifted to south, followed by the center and the northwest. ③Water diversion correlated with irrigation efficiency most significantly, followed by irrigation demand. There was a strong correlation between water diversion and planting structure in Qingtongxia, Yinchuan and Yinnan irrigated districts, whereas no correlation was found between water diversion and water source. 【Conclusion】The development in water-efficient irrigation over the past 20 years was the main reason underlying the decline in water diversion from the Yellow river, followed by decrease in irrigation demand. The water sources did not have a noticeable impact on water diversion. |
| Key words: Qingtongxia; irrigation district; diversion water; determinants |
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