垂直线源灌不同线源直径下的入渗规律及其模型适用性研究

A Study on the Infiltration Rule of Different Line Source Diameters of Vertical Line Source Irrigation and Its Model Applicability

为了提高垂直线源灌的水分利用效率,探明垂直线源灌不同线源直径下的入渗规律,通过模拟试验,研究了垂直线源灌不同线源直径下的入渗规律,比较了三种常规入渗模型的适用性。结果表明,随着线源直径的增加,入渗率和累积入渗量均增大;三种模型均能模拟不同线源直径下的入渗规律,其中Kostiakov入渗公式和Philip入渗模型较精确,Horton(变形)入渗公式更适合于入渗中期和后期的模拟;得出不同线源直径3种入渗模型的经验公式。该研究结果可为垂直线源灌技术推广应用提供理论依据。

In order to improve the water use efficiency of vertical linear irrigation,a simulation experiments was conducted to study the infiltration rule of different line source diameters of vertical line source irrigation,and the applicability of three conventional infiltration models was compared.The results showed that the infiltration rate and cumulative infiltration volume increased with the increase of the diameter of the line source;all the three models could simulate the infiltration law of different line source diameters,among them,the Kostiakov infiltration formula and Philip infiltration model were more accurate,and the Horton(deformation)infiltration formula was more suitable for the simulation of the middle and late infiltration.And the empirical formulas of three infiltration models with line source diameter were obtained.The research results can provide a theoretical basis and practical reference for rational applications of vertical line source irrigation.