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为探讨深层坑渗灌双灌水器土壤水分入渗特性,采用Hydrus-2D软件,建立深层坑渗灌双灌水器条件下的土壤水分运动模型,并通过机理试验对比分析,推求模型参数。结果表明:水平、垂直向上以及垂直向下3个方向湿润锋的拟合结果和实测结果的误差分别为1.28%,3.73%和4.04%,观测点土壤含水量拟合结果与实测结果的平均误差为9.1%,说明所建模型模拟的湿润锋和土壤含水量精度较高。在此基础上,采用该模型分析了湿润体内的土壤水分运动过程,结果表明,随入渗时间的增加,土壤水分运动速度逐渐变慢。
In order to study the characteristics of soil water infiltration in double-emitter irrigation with deep pit, Hydrus-2D software was used to establish the model of soil moisture movement under the condition of deep hole irrigation and double irrigation. The model parameters were deduced through mechanistic tests. The results show that the errors of fitting results and measured results of the wetting front in the horizontal, vertical upward and vertical downward directions are 1.28%, 3.73% and 4.04%, respectively. The average error between the fitting results of soil moisture at the observation points and the measured results It is 9.1%, which shows that the wetting front and the soil water content simulated by the model are more accurate. On this basis, the model was used to analyze the process of soil moisture movement in wetting body. The results show that with the infiltration time increasing, the soil moisture moving speed gradually becomes slower.