| 引用本文: | 张雅梦,康 博,陈 坤,等.灌区田间下渗强度的渗流力学算法[J].灌溉排水学报,2023,42(S1):202-205. |
| ZHANG Yameng,KANG Bo,CHEN Kun,et al.灌区田间下渗强度的渗流力学算法[J].灌溉排水学报,2023,42(S1):202-205. |
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| 摘要: |
| 【目的】在沟渠纵横灌区，潜水水位变动是田间灌溉下渗、沟渠与潜水含水层之间潜水渗流作用的叠加结果，为消减沟渠对潜水水位影响。【方法】依据含灌溉入渗作用的沟渠边界控制下的一维潜水非稳定渗流模型，对模型线性化与齐次化处理后，采用Fourier变换，求出模型的解析解；依据模型的解析解，讨论沟渠对潜水水位变动的影响规律，建立依据潜水水位动态反演田间灌溉下渗强度的算法。【结果】以安徽省淮北平原上一口距离灌溉干渠65 m处的观测孔中潜水水位动态为例，演示反演田间灌溉下渗强度的计算过程；实例中，干渠对潜水水位变动幅度的影响比例，在计算期末达62.8%。【结论】文中提出的依据潜水水位动态反演田间灌溉下渗强度算法，所需资料比较容易获得，实际应用简单、方便。 |
| 关键词: 灌区；潜水；田间灌溉下渗；Fourier变换；沟渠 |
| 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 |
