冻融土壤Philip入渗模型参数的非线性传输函数模型研究

为满足季节性冻土地区越冬期间储水灌溉管理的需求,基于山西省汾河灌区季节性冻土的冬季大田土壤水分入渗试验,得到了120组Philip入渗模型参数实测样本,借助MATLAB软件,建立了以土壤温度、有机质质量分数、土壤含水率、土壤体积质量、物理性黏粒量为输入因子、以Philip入渗模型参数吸渗率和稳渗率为输出因子的多元非线性传输函数模型,并用实测资料对该模型进行了精度检验。结果表明,预测参数的相对误差均小于11%,预报精度在可接受范围之内。

Estimating Philip Infiltration Parameter Using Nonlinear Transfer Function for Water Infiltration in Seasonal Frozen Soil

This paper investigated the demand for water storage forirrigation in winter. We took Linfen Irrigation District in Shanxin Province as an example and measured water infiltrations in frozen soil. We first fitted the infil-tration results to the Phillip infiltration formula and obtained 120 sets of parameters, and we then linked the pa-rameters to other easy-to-measure soil properties including soil temperature, soil organic matter, soil moisture content, soil bulk density and clay content using the multivariate nonlinear transfer function. The transfer func-tion model could predict infiltration rate and steady infiltration rate in the Philip infiltration formula. The accura-cy of the model was tested against measurements. The results showed that the errors of all predicted parameters were less than 11%.