Well bore boundary conditions are incorporated in a three-dimensional ®nite element model that solves the variably saturated groundwater ̄ow equation. One-dimensional line elements, which are used to discretize the ̄ow equation along the well screen, are superimposed onto three-dimensional porous media elements. The use of line elements allows the inclusion of well bore storage e€ects, and also...

Reactive transport in saturated/unsaturated porous media is numerically upscaled to the space–time scale of a hypothetical measurement through coarse-grained (CGST) averages. The reactive modeled at fine-grained Darcy by actual number molecules involved reactions which undergo advective and diffusive movements described global random walk (GRW) simulations. CGST averages verify identities simil...

Abstract A constitutive framework is developed for variably saturated water-active swelling rocks undergoing chemical damage using modified mixture theory and continuum mechanics. The Helmholtzian thermodynamic potential the skeletal system derived as a function of state variables including deformation, damage, two-phase fluid pressures, potential. Using this, in addition to chemo-poroelastic e...

Abstract This paper presents the results of centrifuge tests on rainfall-induced instabilities in variably saturated slopes. The roles rainfall intensity and initial conditions, such as slope angle, porosity degree saturation soil, failure initiation postfailure kinematics are considered. patterns, infiltration profile deformation at prefailure stages characterized. indicate that failures usual...

Interactions between surface and groundwater are a key component of the hydrologic budget on the watershed scale. Models that honor these interactions are commonly based on the conductance concept that presumes a distinct interface at the land surface, separating the surface from the subsurface domain. These types of models link the subsurface and surface domains via an exchange flux that depen...

The assessment of groundwater conditions within an unconfined aquifer with a periodic boundary condition is of interest in many hydrological and environmental problems. A two-dimensional numerical model for density dependent variably saturated groundwater flow, SUTRA (Voss, C.I., 1984. SUTRA: a finite element simulation model for saturated–unsaturated, fluiddensity dependent ground-water flow w...