Numerical simulation for soil water infiltration under double irrigators of deep pit infiltration | 深层坑渗灌双灌水器土壤水分入渗数值模拟

Chinese. 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。

English. In order to discuss the soil water infiltration characteristics of deep pit infiltration irrigation with double irrigators,soil moisture movement model under the condition of double emitters of deep pit infiltration was built with Hydrus-2D software,And the model parameters were calculated by analyzing and comparing with the mechanism test. The results show that： the errors between simulation results and experiment results are 1.28%, 3.73% and 4.04% respectively in horizontal, vertical upward and vertical downward direction of wetting front, and the average error between simulation results and measured results is 9.1% in soil moisture content of observation points, which proved the model has higher precision on simulating wetting front and soil moisture content. Thus, the rationality of the model was corroborated. Moreover, based on the above works, the soil moisture dynamic change regulation of the intersection infiltration of deep pit with double irrigators under the conditions of different infiltration time was obtained by using the model proved above. It is found that the soil water movement speed slow down gradually with the increase of the infiltration time.