A green-Ampt model considering unsaturated zone and pore air pressure

作者：You‐Liang Peng, Liangjun Fei, Fangyuan Shen, Runqiao Zheng, Qian Wang, Qianwen Fan · 发表于：Geoderma · 年份：2025 · DOI：10.1016/j.geoderma.2025.117198 · 被引用次数：7 · 研究领域：Wind and Air Flow Studies、Groundwater flow and contamination studies、Soil and Unsaturated Flow

• Increased the soil bulk density and pressure head will increase pore air pressure; • Clarify the relationship between soil moisture content and infiltration time; • The Green-Ampt formula considering air pressure and unsaturated zone has been proposed; The relationship between infiltration time and the depth of the wetting front can be solved using Darcy’s law. According to this, the infiltration rate is equal to the derivative of the infiltration amount regarding time. However, the traditional Green-Ampt model considers the infiltration amount on the basis of the complete saturation of the wetting regions while ignoring the effect of pore gas pressure. This limits the calculation accuracy of the relationship between infiltration time and wetting front depth. As a response to this problem, this paper analyses the effects of soil bulk density and surface water depth on soil moisture content and pore air pressure at varying depths during water infiltration. It then constructs models for the unsaturated regions and additional pore gas pressure as a means of adjusting the cumulative infiltration volume and infiltration time separately. The results demonstrate that as the bulk density of the soil increased, the infiltration rate decreased while the time required for the wetting front to reach the measurement point increased. As the surface water depth increased, the infiltration rate also increased. During the water infiltration process, the change in pore gas pressure was a con...