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Titolo:
INFLUENCE OF ALTERNATIVE DISSOLUTION MODELS AND SUBSURFACE HETEROGENEITY ON DNAPL DISAPPEARANCE TIMES
Autore:
UNGER AJA; FORSYTH PA; SUDICKY EA;
Indirizzi:
HYDROGEOLOG,1165 HERNDON PKWY HERNDON VA 22070 UNIV WATERLOO,DEPT COMP SCI WATERLOO ON N2L 3G1 CANADA UNIV WATERLOO,WATERLOO CTR GROUNDWATER RES WATERLOO ON N2L 3G1 CANADA
Titolo Testata:
Journal of contaminant hydrology
fascicolo: 3-4, volume: 30, anno: 1998,
pagine: 217 - 242
SICI:
0169-7722(1998)30:3-4<217:IOADMA>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
NONAQUEOUS PHASE LIQUID; SATURATED POROUS-MEDIA; MASS-TRANSFER CHARACTERISTICS; NONSYMMETRIC LINEAR-SYSTEMS; CONTAMINANT TRANSPORT; TRANSFER RATES; SAND AQUIFER; FLOW; REMEDIATION; SIMULATION;
Keywords:
NONEQUILIBRIUM; DISSOLUTION; MULTIPHASE; COMPOSITIONAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
38
Recensione:
Indirizzi per estratti:
Citazione:
A.J.A. Unger et al., "INFLUENCE OF ALTERNATIVE DISSOLUTION MODELS AND SUBSURFACE HETEROGENEITY ON DNAPL DISAPPEARANCE TIMES", Journal of contaminant hydrology, 30(3-4), 1998, pp. 217-242

Abstract

The numerical model CompFlowC + + is used to examine the relative importance of different formulations of a forward dissolution rate model,within the range of parameters measured from laboratory and field studies, for predicting the mean and uncertainty in dense nonaqueous phase Liquids (DNAPL) dissolution times in heterogeneous sandy aquifers. We also investigate whether uncertainty in the DNAPL distribution due to imprecise knowledge of the form of the nonaqueous phase relative permeability curves and the variance of the heterogeneous permeability field are more important factors affecting the dissolution of a DNAPL source zone than the formulation and parameter values of the forward dissolution rate. Results indicate that the mean dissolution time is particularly sensitive to the exponent associated with the nonaqueous phase saturation term, in the kinetic formulation of the forward dissolution rate expression, while the uncertainty is sensitive to the Reynoldsnumber associated with aqueous phase flow. Uncertainty in the DNAPL distribution due to imperfect knowledge of parameters controlling multiphase flow or the geostatistical nature of the aquifer exert less influence on the dissolution behaviour of the DNAPL source zone than the formulation of, or parameters associated with, the forward dissolution rate. (C) 1998 Elsevier Science B.V.

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Documento generato il 27/11/20 alle ore 02:07:39