上层土壤密度对模拟指流层状土壤水分入渗的影响

The Effect of upper Soil Bulk Density on Water Infiltration in Simulate Finger Flow of Layered Soil

通过室内模拟指流,利用回归分析法进行分析,建立了以上层土壤密度为参数的Kostiakov和Philip模型对模拟指流的层状土壤入渗的改进模型,并进行了验证。结果表明,入渗时间相同时,累积入渗量随着上层土壤密度的增加而减小;Kostiakov和Philip模型都适合于模拟有指流产生的层状土壤的入渗,其相关系数都在0.99以上;建立的2个改进模型其计算精度都很高,效率系数分别为97.7%和97.6%。相比而言,Philip模型具有一定的理论依据,可以作为层状土产生指流入渗的有效模型。

In order to reveal the influence law of upper soil bulk density to layered soil of simulate the finger flow, though simulate the finger flow in the lab and regression analysis method in this experiment. The improved Kostiakov and Philip model, which simulate the layered soils of imitate the finger flow, are established and verified through the soil bulk density ＂γ＂ as the model parameter. The results show that. when the infiltration time is same, accumulation infiltration amount decreases with the increase of the upper soil bulk density; Kostiakov and Philip models are suitable for simulating layered soil of engender finger flow, which correlation coefficient is above 0.99;the calculation accuracy is very high of the two improved models which is established. The efficiency coefficients are 97.7% and 97.6% respectively. Compare but talks, Philip model has certain theoretical basis, and can be used as an effective model of infiltration for layered soil of engender finger flow.