The “Physics” of Soil Water Physics

Effect of viscous cross coupling between two immiscible fluids on elastic wave propagation and attenuation in unsaturated porous media

“…The simplest model to describe viscous drag is the Buckingham [9] flux law, which arose in soil physics [28]. This law is an extended version of the Darcy equation allowing for not only a capillary potential but also a saturation-dependent relative permeability.…”