沟灌二维入渗参数的影响因素与计算模型研究

The influencing factors of two-dimension infiltration parameters of Furrow irrigation and calculation model study

为简化沟灌二维入渗参数的获取,本文以室内入渗试验为基础,分析了土壤容重、初始含水量、入渗水头这三个因素对二维和一维入渗参数参数比值的影响,初步建立了由一维垂直入渗参数推求二维入渗参数的多因子计算模型,并对模型分析简化,增加了模型的稳健性,通过大田试验对所建计算模型进行检验。结果表明文中所建二维入渗参数计算模型所求结果为整个灌水田块的均值,其与整个田块全部灌水沟由水流运动数据推求的入渗参数平均值误差不大,且入渗参数k、a增减相反,对累积入渗量的计算结果影响较小,说明本文所建模型对精度要求不高的沟灌灌水方案设计具有一定的指导意义。

In order to simplify the access of the furrow irrigation two-dimensional infiltration parameters, this article analyzes the impact of soil bulk density, initial water content, infiltration head three factors on the pa- rameters of two-dimensional and one-dimensional infiltration parameters ratio, based on indoor infiltration ex- periment. It initially established multi-factor calculation model deriving the two-dimensional infiltration pa- rameters by one-dimensional vertical infiltration parameters and simplified and analyzed the models, increas- ing the robustness of the model, built by the computational model to be tested through field trials. The results show that the results calculated by the two-dimensional infiltration parameter calculation model is equal to the mean values of the entire irrigation parcel, which has less different from seeking infiltration parameters deriv- ing from flow movement data, and decreased with infiltration parameters k, a, has the less impact on the cal- culation results of the cumulative infiltration. The model mentioned in the article has some guiding significance for furrow irrigation program which has less precision design.