Large amounts of the deicing chemicals (DIC) propylene glycol (PG) and formate are spread for removal of snow and ice on the aircrafts and airfields every winter. A considerable amount of these chemicals are carried into surrounding areas, where they mix with snow and infiltrate in the soil during snowmelt. Even though DIC are easily degradable, the high mobility and the high biological oxygen ...

Soil beneath a stormwater infiltration basin receiving runoff from a 23 ha predominantly residential watershed in north-central Florida, USA, was amended using biosorption activated media (BAM) to study the effectiveness of this technology in reducing inputs of nitrogen and phosphorus to groundwater. The functionalized soil amendment BAM consists of a 1.0:1.9:4.1 mixture (by volume) of tire cru...

The Nuclear Waste Policy Act required the U.S. Nuclear Regulatory Commission (NRC) to comment on the Yucca Mountain Site Recommendation relative to the sufficiency of the Project’s information to support a potential license application. As part of the NRC’s associated review process a series of meetings held between August, 2000 and September, 2001, the U.S. Department of Energy (DOE) and the N...

Many studies of water flow and solute transport in the vadose zone require estimates of the unsaturated soil hydraulic properties, including the soil water retention curve ~WRC! describing the relationship between soil suction and water content. An artificial neural network ~ANN! approach was developed to describe the WRC using observed data from several soils. The ANN approach was found to pro...

This study characterizes layer- and local-scale heterogeneities in hydraulic parameters (i.e., matrix permeability and porosity) and investigates the relative effect of layer- and local-scale heterogeneities on the uncertainty assessment of unsaturated flow and tracer transport in the unsaturated zone of Yucca Mountain, USA. The layer-scale heterogeneity is specific to hydrogeologic layers with...

For water dynamics investigation in unsaturated (vadose) zones, ground penetrating radar is a popular hydro-geophysical method because it non-invasive for soil, has high resolution and the results have direct link with content. Soil content soil hydraulic properties are two key factors describing vadose zones. There been tremendous progress estimation radar. The purpose of this paper to provide...

Abstract. The biophysical processes occurring in the unsaturated zone have a direct impact on water table dynamics. Representing these through application of models different complexity has an estimates volumes flowing between and aquifer. These fluxes, known as net recharge, are often used shared variable that couples to groundwater models. However, recharge always affected by degree uncertain...