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| Simulation of effect of water-saving renovation on spatial distribution of groundwater in Jinghui Canal irrigation area |
| Dai Fenggang1,2, Cai Huanjie1, Liu Xuan3, Liang Hongwei3 |
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Abstract In order to evaluate objectively environment impact of water saving renovation on groundwater and figure out a reasonable agricultural water saving scheme and a rational development and utilization mode of groundwater in Jinghui Canal irrigation area, by integrally applying GMS and ArcGIS software, a groundwater distribution model was built. Combining water-saving irrigation canal lining with farmland water saving and agricultural planting structure, eight assumed scenes and actual scenes are used to analyze the effect of water saving renovation on spatial distribution of groundwater. The results show that field water saving engineering can help reduce well irrigation water of 18.5%~33.4% and is very effective in alleviating groundwater level′s falling. Through canal system water saving enginee-ring, water use coefficient is increased by 16.9%, next to which is the role of reducing groundwater exploitation. In Jingyang, Yangfu, Loudi and Zhangbu, the agricultural planting structure and spatial distribution of soil and water resources do not work well together, which offsets the water-saving renovation effect of slowing down the fall of ground water levels, which inevitably led to the increasing trend of groundwater drop funnel. It is recommended that the artificial groundwater regulation and storage, the perfection of groundwater exploitation permit system and the adjustment of agricultural planting structure, could help achieve the sustainable use of the water resources and the sustainable development of water-saving agriculture in the irrigation area.
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Received: 29 July 2012
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