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| DOI：10.13522/j.cnki.ggps.2019159 |
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| Study on Optimal Allocation of Water Resources in Irrigation District Based on Linear Programming and MODFLOW Coupling Technology |
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HU Yanling , HUANG Zhongdong, QI Xuebin, LIANG Zhijie, ZHAO Zhijuan
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1. Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 2.Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 3.Key Laboratory of High Efficient and Safe Utilization of Agriculture Water Resources, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
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| Abstract: |
| 【Objective】The linear programming method is combined with MODFLOW groundwater numerical model to determine the reasonable optimal allocation scheme of agricultural water resources in the Peoples Victory Canal Irrigation Area. 【Method】The distribution of water resources was unreasonable, and the ecological environment was deteriorating gradually in the Peoples Victory Canal Irrigation Area. The irrigation area was divided into three calculation units( I, II and III) according to the landform, engineering type and irrigation water source characteristics of the irrigation area. Based on the linear programming method and MODFLOW groundwater numerical model, the optimal allocation of water resources was carried out for each calculation unit in different hydrological years, and the dynamic change of groundwater level was simulated.【Result】 The optimal allocation scheme of water resources was determined in irrigation districts in different hydrological years: well-canal ratios of the irrigation district calculation units I, II and III were different in different hydrological years. Well-canal ratio were 1/3.14, 1/3.25 and 1/2.92 respectively in flat water years, 1/3.47, 1/3.66 and 1/3.24 respectively in wet years and 1/2.75, 1/2.77 and 1/2.60 respectively in dry years. Compared with the initial depth of groundwater, the simulated depth of groundwater decreased by 0.01 meters in Area I in flat water years, and the total amount of water resources was basically balanced. The simulated groundwater depth increased by 0.12 m and 0.15 m relative to the initial depth in the calculation units II and III; The simulated groundwater depth respectively increased by 0.1 m, 0.23 m and 0.3 m compared with the initial depth in the calculation units I, II and III of the irrigation area in rainy years; In dry years, the simulated groundwater depth in calculation units I, II and III of irrigation district decreased by 0.17 m, 0.08 m and 0.04 m respectively compared with the initial depth. 【Conclusion】The combination of linear programming method and MODFLOW groundwater numerical model can better simulate the groundwater flow field and predict the dynamic change trend of groundwater in the irrigation district, and then a reasonable optimal allocation scheme of water resources is defined. |
| Key words: well-canal irrigation area; linear programming; MODFLOW; optimal allocation of water resources |
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