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The Effects of Water Ponding Depths on Modelling Infiltration Through Hydrophobic Porous Media
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DOI：10.1002/hyp.70639.png)
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Abstract
En 中文
Widespread water-repellent soils in nature exhibit unique hydrological processes, one of which is convex-shaped cumulative infiltration curves. The classical Green-Ampt model fails to simulate this phenomenon. In recent years, researchers have successfully reproduced such curves in subcritical water-repellent soils by incorporating a correction term for decreasing water repellency into the Green-Ampt model. However, whether this model is applicable to hydrophobic soils remains unclear. This study aims to bridge this research gap. Under varying ponded water depths, infiltration experiments were conducted and the hydraulic conductivity of hydrophobic porous media was measured. The Green-Ampt model was then employed to simulate wetting-front positions. By combining these simulations with hydraulic conductivity data, the study investigated how the applicability of the Green-Ampt model varied with ponded water depth. The results showed that the Green-Ampt model had low accuracy in fitting wetting-front positions at a 6 cm ponded water depth, but its performance improved significantly at 17 cm. At a ponded water depth of 28 cm, the model provided a reasonable simulation of the infiltration process. The hydraulic conductivity of the hydrophobic porous media increased with increasing ponded water depth up to a critical threshold of 22.5 cm, beyond which it stabilized and matched the value observed in hydrophilic porous media. The accuracy of the Green-Ampt model in fitting infiltration data was closely related to the variation in hydraulic conductivity with ponded water depth. The underlying mechanisms of the above phenomenon are related to the surface tension effects induced by a hydrophobic surface. The findings suggest that the existing infiltration model cannot be directly applied to hydrophobic soils without modification; the Green-Ampt equation requires adaptation to account for water movement on hydrophobic surfaces.
Keywords:
cumulative infiltration
green-Ampt model
hydraulic conductivity
hydrophobic porous media
ponded water depth
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