| 不同类型下边界条件对模拟灌溉农田水分渗漏的影响 |
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| 引用本文： | 胡克林,肖新华,李保国.不同类型下边界条件对模拟灌溉农田水分渗漏的影响[J].水科学进展,2006,17(5):665-670. |
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| 作者姓名： | 胡克林 肖新华 李保国 |
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| 作者单位： | 中国农业大学土壤和水科学系, 教育部植物-土壤相互作用重点实验室, 北京, 100094 |
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| 基金项目： | 国家自然科学基金;国家高技术研究发展计划(863计划) |
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| 摘 要： | 以田间试验为基础,采用土壤水动力学模型,分别以自由排水、负压水头和地下水埋深三种情况作为下边界,模拟计算了灌溉农田1998年10月-2001年9月期间2 m土体的水分渗漏情况。采用地下水埋深下边界时所得到的剖面分层土壤含水量的模拟值与实测值都比较吻合,而采用自由排水和负压水头下边界时均存在不同程度的偏差。通过与定位通量法估算的水分渗漏动态及累积渗漏量做进一步比较,发现采用地下水埋深下边界时其水分渗漏的动态变化趋势与定位通量法基本一致,因此模型采用地下水埋深作为下边界比较符合当地的实际情况。
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| 关 键 词： | 灌溉农田 动力学模型 不同下边界 水分渗漏 |
| 文章编号： | 1001-6791（2006）05-0665-06 |
| 收稿时间： | 2005-01-09 |
| 修稿时间： | 2005-05-10 |
Numerical analysis of the effect of the different lower boundary conditions on water drainage in irrigated field |
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| HU Ke-lin,XIAO Xin-hua,LI Bao-guo.Numerical analysis of the effect of the different lower boundary conditions on water drainage in irrigated field[J].Advances in Water Science,2006,17(5):665-670. |
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| Authors: | HU Ke-lin XIAO Xin-hua LI Bao-guo |
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| Affiliation: | Department of Soil and Water Sciences, China Agricultural University, Beijing 100094, China |
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| Abstract: | The effect of three different lower boundary conditions(free drainage,pressure head and fixed ground water table) on water drainage in irrigated field is studied using the numerical simulations based on the field data in Quzhou County on North China Plain.The water drainage in 2 m soil profile is calculated by the HYDRUS-1D model from October 1998 to September 2001 When the fixed ground water table is selected as the lower boundary condition,the soil water content at different depth in 2m soil profile is calculated by the HYDRUS-1D model,which agreeds well with the measured values,however,when taking free drainage and pressure head as the lower boundary condition,the difference exists between the measured and the simulated values. In comparison with the result of dynamic water drainage and accumulated water drainage estimated by using the Darcy law,we found that their dynamic process of water drainage by using the fixed ground water table agreed well with that of the Darcy Law.Therefore,the fixed ground water table being selected as the lower boundary condition is suit-able for the local conditions. |
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| Keywords: | Irrigated field dynamic process model different lower boundary conditions water drainage |
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