Modelling Of Contaminant Migration In
Unsaturated Soils
Author(s)
G. Siracusa, A. D. La Rosa, L. Musumeci & G. Maiolino
Abstract
Laboratory studies are useful for understanding the behaviour of chemical
contaminants in soil, although such investigations do not always relate directly to
field conditions. This paper reports an application of a model in order to
investigate the migration of nitrates through the soil. The model calibration was
carried out using the experimental data obtained from two different soil samples
collected in the countryside of Catania (Italy). The device used for laboratory
scale study was a permeameter loaded with the soil samples; acqueous solutions
containing different percentage of nitrate were used as chemical contaminant.
Two software products, SEEP/W and CTRAN/W, are used in tandem to analyze
the contaminant transport for unsaturated conditions: SEEP/W computes the
water flow velocity, volumetric water content, and water flux; CTRAN/W uses
these parameters to compute the contaminant migration. Unsaturated zone
models are useful tools in predicting the effects of measures and can be used to
optimise agricultural practice aiming to minimise the impact on the environment.
Keywords: contaminant migration, soil protection, unsaturated zone model,
permeability, nitrate concentration.
1 Introduction
Nitrate is the most abundant anion reported in contaminated groundwater, soils,
and sediment due to agricultural practice. A considerable mass of nitrate may
accumulate by natural processes in the unsaturated zone (UZ) in arid and
semiarid climates, where infiltration of water at the surface is low [1].
Groundwater quality maybe significantly impacted when this sink of nitrate is
Keywords
contaminant migration, soil protection, unsaturated zone model,
permeability, nitrate concentration.
Related Book
Other papers in this volume
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