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| DOI：10.13522/j.cnki.ggps.2020528 |
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| Using Numerical Simulation to Aid Surface and Subsurface Water Irrigation in Baoshan of Heilongjiang Province |
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JIA Yanhui1, YAN Wei2, GAO Wei3, MA Chunya1, LI Jinshan
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(1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;
2.Investigation Design and Research Institute of Water Conservancy and Hydropower of Hebei Province, Tianjin 300250, China;
3.The Second Design and Research Institute of Water Conservancy and Hydropower of Hebei Province, Shijiazhuang 050021, China)
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| Abstract: |
| 【Background】The project of transforming drylands to paddy fields in Sanjiang Plain in the northeast China has increased its rice cultivation areas from 266 700 hm2 prior to the project to 1 733 300 hm2 after implementing the project. As a result, its demand for water also increased. Baoshan Farm is in the upper reach of Sanjiang plain on a piedmont, and its agricultural production had relied on groundwater since its establishment. Since 1992, it has gradually converted drylands to paddy field, and such a land conversion has resulted in a conflict between increased demand for water and limited water availability.【Objective】The purpose of this paper is to analyze how to optimize the use of surface water and groundwater to resolve the conflict between limited water supply and the increased demand for water due to the land use change, so as to avoid waterlogging while in the meantime alleviating continued groundwater table dropping.【Method】The calculation was based on groundwater flow with the groundwater dynamics under different managements simulated using the software Modflow-2000. The aquifer parameters, model validation and sensitivity analysis of the parameters were carried out using long-term hydrogeological data measured from the area. We then compared groundwater dynamics under irrigations using different combinations of surface water and groundwater.【Result】The calibrated groundwater dynamics model correctly reproduced the measured changes in groundwater level in the studied area; sensitivity analysis revealed that the initial groundwater level did not have a noticeable influence on long-term groundwater variation. Using the river water to irrigate areas 10 km in the proximity of the river while irrigating other areas using the groundwater can keep groundwater resource balance while in the meantime alleviating waterlogging. In contrast, irrigating too many areas using transferred river water could raise the groundwater table and result in waterlogging in a wide range of areas.【Conclusion】Rational use of groundwater and surface water in irrigation can maintain groundwater balance and avoid waterlogging in the farmlands of Baoshai; a monitoring system should be in place to timely measure the change in groundwater table. |
| Key words: Baoshai; groundwater model; surface water; groundwater; irrigation |
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