土壤容重对深层坑渗灌入渗特性影响的试验研究

为了揭示土壤客重对深层坑渗灌入渗量的影响规律,通过室内均质土模拟试验,采用非线性回归法对试验数据进行分析;建立了以土壤容重为参数深层坑渗灌的Kostiakov和Philip改进模型,并进行了验证.结果表明:入渗时间相同时,入渗量随着土壤容重的增大而减小;Kostiakov入渗模型和Philip入渗模型都适用于模拟深层坑深灌的入渗过程,相关系数均在0.99以上;建立的2个改进模型计算精度均很高,效率系数分别为99.7%和99.9%.相比较而言,深层坑渗灌的Philip模型具有一定的理论依据,计算精度较高且模拟效果好,可作为计算深层坑渗灌入渗量的有效模型.

Experimental study on impact of soil bulk density on infiltrationproperties of deep pit infiltration irrigation

In order to reveal the effects of soil bulk density on the infiltration volume of deep pit irrigation,the indoor simulation experiment of heterogeneity soil was done,and then the experimental data was analyzed by the non-linear regression method.Kostiakov and Philip advanced infiltration model with parameter of bulk density were established and proved.The main findings indicate that:the infiltration volume increases with the decrease of soil bulk density at the same time;Kostiakov and Philip infiltration models are applicable to infiltration of deep pit irrigation and their correlation coefficients are both above 0.99.Both models showed very high accuracy and the efficiencies of the model coefficients were 99.7% and 99.9% respectively .Compared to Kostiakov model,Philip model with theoretical basis,high accuracy and better simulation results was considered as an effective model for calculating the volume infiltration of deep pit irrigation.