DNAPL distribution in the source zone: effect of soil structure and uncertainty reduction with increased sampling density

Journal of Contaminant Hydrology
Marina Pantazidou, Ke Liu

Abstract

This paper focuses on parameters describing the distribution of dense nonaqueous phase liquid (DNAPL) contaminants and investigates the variability of these parameters that results from soil heterogeneity. In addition, it quantifies the uncertainty reduction that can be achieved with increased density of soil sampling. Numerical simulations of DNAPL releases were performed using stochastic realizations of hydraulic conductivity fields generated with the same geostatistical parameters and conditioning data at two sampling densities, thus generating two simulation ensembles of low and high density (three-fold increase) of soil sampling. The results showed that DNAPL plumes in aquifers identical in a statistical sense exhibit qualitatively different patterns, ranging from compact to finger-like. The corresponding quantitative differences were expressed by defining several alternative measures that describe the DNAPL plume and computing these measures for each simulation of the two ensembles. The uncertainty in the plume features under study was affected to different degrees by the variability of the soil, with coefficients of variation ranging from about 20% to 90%, for the low-density sampling. Meanwhile, the increased soil sampl...Continue Reading

References

Dec 19, 2002·Journal of Contaminant Hydrology·Michael C BrooksCarl G Enfield

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Citations

Nov 3, 2010·Journal of Contaminant Hydrology·Michael Dietze, Peter Dietrich
Mar 17, 2010·Journal of Contaminant Hydrology·John A ChristLinda M Abriola

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