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

Pantazidou, M; Liu, K

dc.contributor.author	Pantazidou, M	en
dc.contributor.author	Liu, K	en
dc.date.accessioned	2014-03-01T01:28:10Z
dc.date.available	2014-03-01T01:28:10Z
dc.date.issued	2008	en
dc.identifier.issn	0169-7722	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/18746
dc.subject	DNAPL infiltration	en
dc.subject	Field-scale heterogeneity	en
dc.subject	Hazardous waste site characterization	en
dc.subject	Multiphase fluid flow	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Water Resources	en
dc.subject.other	Aquifers	en
dc.subject.other	Computer simulation	en
dc.subject.other	Hydraulic conductivity	en
dc.subject.other	Impurities	en
dc.subject.other	Multiphase flow	en
dc.subject.other	Thermal plumes	en
dc.subject.other	DNAPL infiltration	en
dc.subject.other	Field-scale heterogeneity	en
dc.subject.other	Hazardous waste site characterization	en
dc.subject.other	Soils	en
dc.subject.other	Aquifers	en
dc.subject.other	Computer simulation	en
dc.subject.other	Hydraulic conductivity	en
dc.subject.other	Impurities	en
dc.subject.other	Multiphase flow	en
dc.subject.other	Soils	en
dc.subject.other	Thermal plumes	en
dc.subject.other	aquifer	en
dc.subject.other	estimation method	en
dc.subject.other	heterogeneity	en
dc.subject.other	hydraulic conductivity	en
dc.subject.other	nonaqueous phase liquid	en
dc.subject.other	numerical model	en
dc.subject.other	plume	en
dc.subject.other	pollutant source	en
dc.subject.other	pollutant transport	en
dc.subject.other	soil structure	en
dc.subject.other	spatial distribution	en
dc.subject.other	article	en
dc.subject.other	geostatistical analysis	en
dc.subject.other	hydraulic conductivity	en
dc.subject.other	plume	en
dc.subject.other	priority journal	en
dc.subject.other	qualitative analysis	en
dc.subject.other	quantitative analysis	en
dc.subject.other	simulation	en
dc.subject.other	soil analysis	en
dc.subject.other	soil pollution	en
dc.subject.other	soil structure	en
dc.subject.other	statistical analysis	en
dc.subject.other	Computer Simulation	en
dc.subject.other	Filtration	en
dc.subject.other	Pressure	en
dc.subject.other	Soil	en
dc.subject.other	Uncertainty	en
dc.title	DNAPL distribution in the source zone: Effect of soil structure and uncertainty reduction with increased sampling density	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jconhyd.2007.11.002	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jconhyd.2007.11.002	en
heal.language	English	en
heal.publicationDate	2008	en
heal.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 sampling frequency resulted in reductions of uncertainty varying from 7% to 69%, for low- and high-uncertainty variables, respectively. In view of the varying uncertainty in the characteristics of a DNAPL plume, remedial designs that require estimates of the less uncertain features of the plume may be preferred over others that need a more detailed characterization of the source zone architecture. (C) 2007 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Journal of Contaminant Hydrology	en
dc.identifier.doi	10.1016/j.jconhyd.2007.11.002	en
dc.identifier.isi	ISI:000254134400011	en
dc.identifier.volume	96	en
dc.identifier.issue	1-4	en
dc.identifier.spage	169	en
dc.identifier.epage	186	en