Subsurface airflow in unsaturated zones induced by natural forcings is of importance in
many environmental and engineering fields, such as environmental remediation, water …

The decrease of rock stability is caused by the possible deterioration of rock mechanical
properties under high temperature environment. Therefore, the study of the constitutive …

The fluctuation of the groundwater table can cause upward and downward advection of soil
gas within the vadose zone, just like breathing. In this study, we developed a three …

Modelling of flow and transport in unsaturated soils requires information on two fundamental
hydraulic properties: the soil water retention curve and relative hydraulic conductivity. A …

In this chapter a general model for the two-phase fluid flow in porous media is presented,
together with its simplified form, known as the Richards equation, which is applicable (under …

Diffusive flux is traditionally treated as the dominant mechanism of gas transport in
unsaturated zones under natural conditions, and advective flux is usually neglected …

When the unsaturated zone of the unconfined aquifer is covered by a low‐permeability
upper layer, significant airflow will be generated in the unsaturated zone during water …

Specific yield (S y) is an essential hydrogeological parameter in groundwater-related
modeling and estimation. In this study, we proposed several new analytical expressions of S …

Simulating drainage in volumetric images of porous materials is a key technique for studying
multiphase flow and transport. Image‐based techniques based on sphere insertion are …

Alluvial fan is an important recharge area for arid and semi-arid inland basins. In order to
study groundwater circulation and quantify recharge amount of the groundwater system in …