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| DOI：10.13522/j.cnki.ggps.2023536 |
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| Groundwater Dynamics Method for Evaluating the Irrigation Infiltration of Farmland |
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ZHANG Yameng, KANG Bo, CHEN Kun, LI Yanjun, TAO Yuezan, YANG Jie, HE Zhenyu
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Hefei University of Technology, Hefei 230009, China
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| Abstract: |
| 【Objective】In the irrigated area crisscrossed by canals, variation of unconfined groundwater table is controlled by the irrigation infiltration of farmland and the phreatic flow between the canal and unconfined aquifer. The purpose of this paper is reduce the influence of canal on the groundwater table. 【Method】A one-dimensional transient phreatic flow model subjected to the canal boundary and the irrigation infiltration was established. Based on the linearization and homogenization about the model, analytical solution of the model was given by using the Fourier transformation. Based on this solution, the method was established to inverse the infiltration intension according to the variation of groundwater table, and the variation regulation of groundwater table influenced by canal was discussed. 【Result】An observation hole 65 m from a main irrigation canal in the HuaiBei Plain of Anhui province was take as example, and the inversion process was demonstrated. At the end of the calculation period, about 62.8% of the groundwater table fluctuation was contributed by the effects of the canal. 【Conclusion】The method for inversing the infiltration intension proposed in the paper, requires relatively accessible data and offers straightforward and convenient practical application. |
| Key words: irrigated area; unconfined groundwater; irrigation infiltration; Fourier transformation; canal |
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