| Cite this article: | 刘宽,翟家齐.青铜峡灌区引水变化趋势及影响因素解析[J].灌溉排水学报,0,():-. |
| liukuan,zhaijiaqi.青铜峡灌区引水变化趋势及影响因素解析[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Analysis on Changing Trend and Influencing Factors of Water Diversion in Qingtongxia Irrigation Area |
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liukuan, zhaijiaqi
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China Institute of Water Resources and Hydropower Research
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| Abstract: |
| 【Objective】Analyse the spatial and temporal variation law of water diversion in Qingtongxia irrigation area and analyse the influence degree of each factor on water diversion.【Method】Linear tendency estimation method was used to analyse the changing trend of diversion water in Qingtongxia irrigation area and each sub-irrigation area from 1998 to 2017. Besides, Pearson correlation coefficient method was used to analyse the correlation between diversion water and water source conditions, irrigation demand and irrigation efficiency.【Result】①Temporally, the annual variation of water diversion of Qingtongxia irrigation area and Yinchuan irrigation area, Yinnan irrigation area and Yinbei irrigation area showed negative annual trends, which were 1 330, 570, 520 and 250 million m3/10a. During the year water diversion was mainly concentrated in the irrigation period from May to August and the winter irrigation period from October to November. The decrease of water diversion was most significant during irrigation period. ② Spatially, irrigation water per unit area showed a downward trend, and the rate of decline was significantly different in each region. The distribution pattern of irrigation water per unit area in different periods changed significantly. The spatial distribution changed from 1998—2002, when the per unit area irrigated water amount was the largest in the middle of the irrigated area, the second in the south and the smallest in the north, to 2013—2017, when the spatial distribution pattern was the largest in the southeast of the irrigated area, the second in the middle and southwest, and the smallest in the north. The maximum per unit area irrigated area was transferred from the middle to the southeast of the irrigated area. ③ The results showed that the correlation between water diversion and irrigation efficiency was the strongest. The relationship between irrigation water diversion and irrigation demand in irrigated areas was the second strongest, and there was a strong correlation between water diversion and planting structure in Qingtongxia, Yinchuan and Yinnan irrigated areas. Besides, there was no correlation between water diversion and water source. 【Conclusion】For the past 20 years, with promoting water-efficient irrigation vigorously, the improvement of irrigation efficiency is the most important factor driving the decrease of water diversion in irrigated areas, followed by irrigation demand. The influence of water source conditions on water diversion in irrigated areas is relatively weak. |
| Key words: irrigation area; irrigation water; Influencing factors; Changing trend |
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