膜孔肥液单向交汇入渗特性及数学模型研究

通过室内入渗试验,分析了膜孔肥液单向交汇的入渗特性。在此基础上,根据已知试验资料,提出了Kostiakov模型、分段函数模型、减渗量模型和增渗率模型等4个膜孔肥液单向交汇入渗模型。Kostiakov模型建立的条件是膜孔肥液单向交汇入渗参数均为已知;分段函数模型建立的条件是膜孔肥液自由入渗和单向交汇入渗参数均为已知;减渗量模型建立的条件是膜孔肥液单向交汇入渗相对于膜孔肥液自由入渗的减渗量参数和膜孔肥液自由入渗参数已知;增渗率模型建立的条件是膜孔肥液单向交汇入渗相对膜孔清水单向交汇入渗增渗率和清水单向交汇入渗参数已知。模型验证表明,所提出的4个模型均为描述膜孔肥液单向交汇入渗的有效模型,其中分段函数模型的计算精度相对最高,Kostiakov模型、减渗量模型和增渗率模型稍次之。在实际应用中,可根据不同的已知资料情况加以选用。

Mathematical models for single-line interference infiltration of fertilizer solution in film hole

Based on lab.experiment,characteristics of single-line interference irrigation of fertilizer solution in film hole were analyzed.Four mathematical models were presented based on different measured data,such as Kostiakov model,piecewise function model,reduction volume model and increasing infiltration ratio model for film hole fertilizer solution single-line interference irrigation.Kostiakov model is based on the infiltration parameters of film hole single-line interference infiltration which are known;Piecewise function model is based on the infiltration parameters of two stages of film hole single-line infiltration-film hole free infiltration and interference infiltration which are known;Reduction volume model is based on the rate of reduced infiltration that film hole single-line infiltration compared with film hole free infiltration and the parameters of free infiltration which are known;Increasing infiltration ratio model is based on the rate of increased infiltration that film hole fertilizer solution single-line interference infiltration as compared with film hole single-line interference infiltration and the parameters of fresh water infiltration which are known.The four infiltration models are effective models for film hole fertilizer solution single-line interference irrigation through the measured data.The calculation precision of piecewise function model is the most accurate.The calculation precision of three others’ is relatively less accurate.The models may be selected in the light of measured data.