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为了对比夹层位置和土壤质地变化对层状土入渗特征的影响,选用2种土壤、设置3个夹层位置进行了积水入渗试验.结果表明:在夹层位置为距土表5～10,10～15和20～25 cm这3种情况下,湿润锋到达土层界面的时间和相应的累积入渗量随夹层位置和夹层土壤质地的差异而有所不同.夹层的层位越靠上,湿润锋到达夹层分界线所需要的时间越短,相应的累积入渗量越小.距土表10～15 cm的夹层位置减渗效果最好;夹砂层位置越深,其对入渗率的改变程度越明显,入渗率曲线整体抬高.累积入渗量及湿润锋在水分进入夹层界面前随时间延长而非线性递增,而在水分进入层界面之后趋于线性变化,两者之间具有概化的线性关系,且其线性关系随夹层位置的变化而不同.层状土的土壤含水率分布具有不连续性,同时还受夹层土壤质地的影响.总体上,夹层位置变化对不同质地层状土的入渗有明显影响.
In order to compare the influence of interlayer location and soil texture on the infiltration characteristics of layered soil, two kinds of soil were selected and three intercalation sites were set up to infiltrate water infiltration test.The results showed that the intercalation location was 5 ~ 10 from the soil surface, 10-15 and 20-25 cm, the time when the wetting front reached the interface of the soil layer and the corresponding cumulative infiltration amount differed with the difference between the interlayer location and the interlayer soil texture. , The shorter the time required for the wetting front to reach the boundary of the mezzanine is, the smaller the corresponding cumulative infiltration is. The better intercept effect is achieved at the 10 ~ 15 cm distance from the soil surface. The deeper the sand layer is, The more obvious the rate of change is, the higher the infiltration rate curve is, and the cumulative infiltration and wetting front tend to increase linearly with time until they enter the interlayer interface, but tend to change linearly after the water enters the interface. And the linear relationship between them varies with the location of interlayer.The distribution of soil moisture in layered soil is discontinuous and is also affected by the texture of interlayer soil.Overall, Infiltration of layered soils with different textures Significantly affected.