In the present paper a set of physically based expressions for estimating the infiltrated volume and the flow rate from hemispherical and disc sources are presented. The proposed formula depends on four parameters: the initial and the saturated soil water contents, the saturated hydraulic conductivity and the wetting front suction head. The developed models allow the accurate estimation of the infiltrated flow when compared with the same phenomena simulated with Richardś equation. Dimensionless expressions were also deduced which help draw general conclusions on the infiltration processes. Taking advantage of the small number of parameters included in the developed expressions, it was proposed a simple procedure for soils characterization. The method requires measuring both the initial and saturated soil water content and the infiltrated volume over time from a disc source and, aided with the developed expressions, allows deducing both the saturated hydraulic conductivity and the wetting front suction head.

在本文中，提出了一组基于物理的表达式，用于估计半球形和盘状源的渗透量和流速。所提出的公式取决于四个参数：初始和饱和土壤水含量，饱和导水率和润湿前吸头。与用理查兹方程模拟的相同现象相比，开发的模型可以准确估计渗透流量。还推导了无量纲表达式，这有助于对渗透过程得出一般结论。利用开发的表达式中包含的少量参数，提出了一种简单的土壤表征方法。