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本文对渗灌条件下的非饱和土壤水二维流动问题进行了探讨。对水平二维流及垂直二维流均进行了重复实验,并建立了相应的非饱和土壤水二维流的数学模型。按有限差分的计算方法求到数学解且与实验结果相符合,验证了该数学模型的可行性。同时应用数学模型对田间渗灌在不同条件下(如不同初始含水量、不同的土质、不同的密实度及不同直径供水管等几个主要因素)的非饱和土壤水二维流进行了模拟计算。根据计算结果分别就上述各影响因素对田间渗灌的非饱和二维流动的差异性进行了分析,由此对田间渗灌中若干问题提出初步看法。
In this paper, the problem of two-dimensional flow of unsaturated soil water under seepage irrigation is discussed. Two-dimensional flow and vertical two-dimensional flow are repeated experiments were carried out, and established the corresponding unsaturated soil water two-dimensional flow mathematical model. According to the finite difference method, the mathematical solution is obtained and the result is in good agreement with the experimental result, which verifies the feasibility of the mathematical model. At the same time, mathematical model was applied to simulate the two-dimensional flow of unsaturated soil water under different conditions (such as different initial water content, different soil quality, different densities and different diameters of water supply pipes) . According to the calculation results, the differences of unsaturated two-dimensional flow in field seepage irrigation are analyzed respectively based on the above factors, and some preliminary opinions on some problems in field seepage irrigation are put forward.