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| Reasonable canal-to-well irrigation water quantity ratio in irrigation district based on groundwater balance |
| Li Jiancheng, Wei Xiaomei, Deng Kangjie |
| College of Water Resource and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China |
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Abstract Based on a groundwater balance model, the groundwater balance in different frequency typical years is analyzed in Jinghui Canal Irrigation District in Shaanxi Province. The results show that the precipitation recharge, canal seepage and the field irrigation infiltration and well irrigation regression recharge are the major recharge sources of groundwater in the irrigation district, accounting for 85.99%-82.89% of the total recharge. However, the artificial exploitation is the main discharge way of groundwater, and the exploitation quantity of water accounts for 69.7%-72.86% of the total exploitation for the use of agricultural irrigation, human and animals and the industrial water supply. Regarding 2010 as the reference year and 2020 as the planning year, four different development scenarios are established by considering the irrigation district development plan, then the groundwater depths in those scenarios are calculated by using the groundwater balance model, which is ranged from 0 to 0.07 m. By minimizing the change in groundwater level, the reasonable canal-to-well irrigation water quantity ratio is determined to be in a range of 1.49-1.53 in different frequency typical years acquired. This study provides a basis for groundwater to be utilized in a more sustainable and efficient manner in the irrigation district.
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Received: 26 July 2014
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