We derive 1D steady equilibria for partially saturated downslope flow as a solution to the reposed vadose-zone problem. The equilibria are determined by two free parameters: a mean flow and a downstream saturation. Where there is no downstream saturation, a uniform outflow of constant saturation is obtained, but if an isolated zone of excess downstream saturation exists, the upstream flow speed...

Local emissions of SF6 are of interest for studying their impact on the use of SF6 as a groundwater-dating tool near source regions as well as for investigating the spatial distributions of (inert) gaseous compounds spreading from urban or industrial centers. A precondition for the use of SF6 in such studies is the capability to document the temporal and spatial evolution of SF6 in and around s...

The process of how soil moisture profiles evolve into the and reach root zone could be estimated by solving appropriate strong nonlinear Richards’ equation. nonlinearity equation occurs because diffusivity D is generally an exponential function water content. In this work, boundary conditions physical problem are considered fuzzy for various reasons (e.g., machine impression, human errors, etc....