Per‐and polyfluoroalkyl substances (PFAS) are emerging contaminants of critical concern.
As surfactants, PFAS tend to accumulate at air‐water interfaces and may stay in the vadose …

We critically examine historical and recent studies of flow and transport at the local scale
within the capillary fringe (CF). The characterization of subsurface pathways traveled by …

Surface-active solutes that exist in the subsurface either naturally (humic acid) or as a result
of anthropogenic activities (alcohols, surfactants, PFAS) alter the hydraulic and geotechnical …

We examine subsurface uranium (U) plumes at two US Department of Energy sites that are
located near large river systems and are influenced by groundwater–river hydrologic …

We have studied the combined imbibition and evaporation of surfactant solutions into thin
porous media by means of experiments and numerical simulations. Solutions of anionic and …

Water percolation and tracer migration through the vadose zone underneath an ephemeral
channel were studied using a vadose zone monitoring system (VMS) and application of a …

Soil water repellency (SWR) has a substantial effect on soil–water hydrology: it hinders
infiltration, leading to enhanced surface runoff and soil erosion, and causes preferential flow …

Oxygen transport across the capillary fringe is relevant for many biogeochemical processes.
We present a non-invasive technique, based on optode technology, to measure high …

Hydraulic fracturing is expanding rapidly in the US to meet increasing energy demand and
requires high volumes of hydrofracking fluid to displace natural gas from shale. Accidental …

Gasohol spills may easily descend through the soil column down and impact sensitive
receptors as contaminants dissolve into the groundwater. Gasoline formulations are …