Abstract
The unsaturated zone, also termed the vadose zone, is the portion of the subsurface above the groundwater table. It contains air as well as water in the pores. This zone is also high in organic matter and clay, which promotes sorption, biological degradation and transformation of contaminants. In industrial or agricultural areas, where the ground surface is contaminated by hazardouswastes or fertilizers and pesticides, the unsaturated zone may be thought of as a buffer zone, which provides protection to the underlying aquifers. Unsaturated zone is often regarded as a filter removing undesirable substances before they affect aquifers, and the hydrogeologic properties of unsaturated zone are the most important factor for groundwater deterioration induced by surface contamination (Stephens 1996; Selker et al. 1999).
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Rumynin, V.G. (2011). Water Movement and Solute Transport in Unsaturated Porous Media. In: Subsurface Solute Transport Models and Case Histories. Theory and Applications of Transport in Porous Media, vol 25. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1306-2_2
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