| Cite this article: | 常晓敏,刘思妤,王少丽,等.基于SahysMod模型的节水条件下河套灌区水盐动态模拟[J].灌溉排水学报,2022,():-. |
| CHANG Xiaomin,LIU Siyu,WANG Shaoli,et al.基于SahysMod模型的节水条件下河套灌区水盐动态模拟[J].灌溉排水学报,2022,():-. |
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| DOI： |
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| Dynamic simulation of water and salt in Hetao irrigation area under water saving condition based on SahysModmodel |
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CHANG Xiaomin, LIU Siyu, WANG Shaoli, GUAN Xiaoyan, CHEN Haorui
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China Institute of Water Resources and Hydropower Research
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| Abstract: |
| 【Objective】 In order to explore the long-term changes of regional water and salt dynamics under different water-saving conditions, and to provide data support for the appropriate water-saving scale and irrigation and drainage management in the irrigation area.【Method】A typical Hetao Irrigation District was selected as the study area, the spatial variability of meteorology, hydrogeology, soil, irrigation, crops, etc., were comprehensively considered.
The dynamic changes of water and salt in different scenarios were simulated and predicted by the method of combining SahysMod model and GIS, and the data from 2007 to 2012 and 2013 to 2016 were used to calibrate and verify the model.【Result】The results showed that the annual drain discharge firstly decreases and then gradually stabilizes, and the average annual discharge was 531 million m3; the soil salinity of cultivated land in the middle and upper reaches of the irrigation area decreased slightly and increased significantly in the lower reaches under the existing irrigation and drainage conditions; Under the comprehensive consideration of water saving in the irrigation area and the ecological environment water demand of Wuliangsuhai downstream, the total water diversion from the canal head in the future can be reduced by up to 15% and 646 million m3 of water can be saved at most. If the field irrigation amount remains unchanged, the canal system water utilization coefficient can be increased by 17.6%. When the total water diversion reduction was the same, the scheme of field irrigation amount reduction had a better effect on improving the salt discharge capacity of irrigation district. Therefore, priority should be given to reduce the amount of field irrigation, and then to improve the water utilization coefficient of canal system.【Conclusion】While saving water on a large scale in the irrigation area, it is necessary to comprehensively consider the needs of the downstream ecological environment then determine the best water management scheme in combination with the analysis of the actual ecological water replenishment conditions in the irrigation area. |
| Key words: SahysMod model; water and salt dynamics; Spatial change; irrigation water saving; irrigation and drainage management |
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