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中文摘要：
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2m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。
英文摘要：
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 2 m 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 Darey 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 suitable for the local conditions.
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