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Theoretical and Experimental Research of Cumulative Infiltration

机译:累积入渗的理论与实验研究

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摘要

The main object of this study is the comparative evaluation of Green & Ampt's (G & A) and Parlange's (P's) models and their ability to describe cumulative infiltration of water through various soil types. Three soil samples of different hydraulic properties were packed separately into a transparent vertical column. A constant head boundary condition was applied at the surface of the soil and the incoming amount of water was measured volumetrically. Soil moisture was measured using TDR waveguides at certain locations of the column. At the early times of cumulative infiltration, sorptivity of each soil sample was estimated. Theoretical research showed that both models converge to the same equation at the early times of infiltration and that the slopes of the two models are the same for large times of infiltration, but the curves of the two models are parallel shifted. P's and G & A's models approximate well the experimental points of cumulative infiltration of the three soil samples at small times of infiltration, but P's model approximates better the experimental points at large times of infiltration.
机译:这项研究的主要目的是对Green&Ampt(G&A)模型和Parlange(P)模型的比较评估,以及它们描述水在各种土壤类型中的累积渗透的能力。将三种具有不同水力特性的土壤样品分别装填到透明的垂直柱中。在土壤表面施加恒定的头部边界条件,并按体积测量进水量。使用TDR波导在柱的某些位置测量土壤湿度。在累积入渗的早期,估计每个土壤样品的吸着性。理论研究表明,两个模型在入渗初期均收敛于相同的方程,并且两个模型的斜率在大量入渗时是相同的,但是两个模型的曲线是平行移动的。 P's和G&A's模型很好地近似了三个土壤样品在小渗透时期的累积入渗实验点,而P's模型则更好地近似了在大渗透时期的三个实验点。

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