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Evaluating the Impact of the Covariance of the Friction and Potential Gradient on Describing the Infiltration Process
Transport in Porous Media ( IF 2.7 ) Pub Date : 2018-09-08 , DOI: 10.1007/s11242-018-1141-z
Myron van Damme 1
Affiliation  

During infiltration of water in soil, menisci form at the interface of water, grains, and air in the pores, inducing suction due to surface tension. Due to the random distribution of interconnected pores of different sizes, characteristic of porous media, differences in suction and friction inside pores give a diffusing infiltration front. The process of infiltration is often simulated by solving Richards’ equation in which the water flux is calculated with Darcy’s law. Underlying Darcy’s law is the assumption that the gradients in flow potential and the flow resistance due to viscous forces are independent from each other. This paper shows that these parameters are dependent and negatively correlated. A new method for calculating flows in unsaturated porous media has been developed to evaluate the impact of the covariance on infiltration predictions. The results show that the impact is significant and leads to a reduction in infiltration rate and mean friction experienced during infiltration. The method thereby provides a physical explanation for the subdiffusion observed during water infiltration in soil and is consequently expected to provide more insights into the processes of infiltration.

中文翻译:

评估摩擦和势梯度的协方差对描述渗透过程的影响

在水渗入土壤过程中,在孔隙中水、颗粒和空气的界面处形成弯液面,由于表面张力而产生吸力。由于大小不一的连通孔的随机分布、多孔介质的特性、孔内吸力和摩擦力的差异,形成了扩散渗透前沿。入渗过程通常通过求解理查兹方程来模拟,其中使用达西定律计算水通量。达西定律的基础是假设流动势的梯度和由粘性力引起的流动阻力彼此独立。这篇论文表明,这些参数是相关的,并且是负相关的。已经开发了一种计算不饱和多孔介质中流动的新方法,以评估协方差对渗透预测的影响。结果表明,影响是显着的,并导致渗透率和渗透过程中经历的平均摩擦力降低。因此,该方法为土壤中水渗透过程中观察到的亚扩散提供了物理解释,因此有望提供对渗透过程的更多见解。
更新日期:2018-09-08
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