Advanced In Situ Soil Water Sampling System for Monitoring Solute Fluxes in the Vadose Zone

An Integrated Approach for Modeling Water Flow and Solute Transport in the Vadose Zone

As geographical information systems (GIS) are increasingly being applied to surface and subsurface flow and transport modeling issues, it becomes important to more clearly define potential advantages and achievable objectives with this technology. This chapter describes an integrated conceptual framework for predicting basin-scale solute loading rates through and from the vadose zone. The appro...

An Improved Dual-Permeability Model of Water Flow and Solute Transport in the Vadose Zone

onstrated under field conditions (e.g., Flury, 1996; Jarvis, 2002). We introduce an improved, one-dimensional, non-steady-state dualIn recent years, our knowledge of the mechanisms that permeability model (MACRO 5.1). The model simulates water flow generate and sustain preferential movement of water and solute transport in the vadose zone of structured soils by coupling and solutes has been inc...

An Integrative Approach for Monitoring Water Movement in the Vadose Zone

While ERT surveys are useful, Yeh et al. (2002) showed that uncertainties in tracking moisture movement in the Electrical resistivity tomography (ERT), during the past few years, vadose zone on the basis of ERT surveys alone can has emerged as a potentially cost-effective, noninvasive tool for imaging changes of moisture content in the vadose zone. The accuracy be quite significant. They report...

In situ bioremediation of perchlorate in vadose zone soil using gaseous electron donors: microcosm treatability study.

A series of microcosm experiments were performed to determine the effectiveness of various gaseous electron donors (including hydrogen, 1-hexene, ethyl acetate, and liquefied petroleum gas [LPG]) for supporting biological perchlorate reduction under different electron donor concentrations and soil moistures. Under high soil moisture (16% w/w) conditions, complete or partial perchlorate degradat...

Biodegradation in the Vadose Zone