膜孔灌溉单孔入渗Kostiakov模型建立与验证

以非饱和土壤水分运动理论为基础,研究膜孔灌单孔入渗土壤水分运动的数学模型,用SWMS-3D软件对多种典型土壤的单点膜孔入渗特性进行模拟.结果表明:单点膜孔的累积入渗量变化过程符合Kostiakov模型.提出包含膜孔直径、灌溉水深的单点膜孔Kostiakov入渗模型参数计算方法,采用多种土壤单点膜孔入渗室内试验结果与已有文献资料对所建模型进行验证,结果表明,所建模型能较准确地反映单点膜孔入渗特性,可为确定合理的膜孔灌灌水技术要素组合提供理论依据.

Establishment and verification of Kostiakov model for film-hole irrigation with single-hole infiltration

Based on the theory of water movement in non-saturated soil,the mathematical model of film-hole irrigation with single-hole infiltration was investigated and the simulation of infiltration characteristics of various typical soils was performed by using SWMS-3D software.The result showed that the variation of cumulative infiltration through single hole conformed to Kostiakov model.A computation method of parameters such as the film-hole diameter and irrigation depth was presented with single-point film-hole Kostiakov infiltration model.The model was verified by comparing indoor test result of single-point film-hole infiltration for various typical soils to that of other researcher’s experiment.It was shown that the established model was able to reflect more accurately the characteristics of single-point film-hole infiltration and water to provide a theoretical basis for determing a resonable combination of irrigational technological elements with film-hole infiltration.