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Titolo:
DENSITY-DEPENDENT SOLUTE TRANSPORT IN DISCRETELY-FRACTURED GEOLOGIC MEDIA - IS PREDICTION POSSIBLE
Autore:
SHIKAZE SG; SUDICKY EA; SCHWARTZ FW;
Indirizzi:
UNIV WATERLOO,DEPT EARTH SCI WATERLOO ON N2L 3G1 CANADA OHIO STATE UNIV,DEPT GEOL SCI COLUMBUS OH 43210
Titolo Testata:
Journal of contaminant hydrology
fascicolo: 3, volume: 34, anno: 1998,
pagine: 273 - 291
SICI:
0169-7722(1998)34:3<273:DSTIDG>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADVECTIVE-DISPERSIVE TRANSPORT; POROUS-MEDIA; CONTAMINANT TRANSPORT; MATRIX DIFFUSION; UNSATURATED ZONE; ORGANIC VAPORS; MASS-TRANSPORT; FLOW; SIMULATION; GROUNDWATER;
Keywords:
GROUNDWATER MODELING; HYDROGEOLOGY; FRACTURES; SOLUTE TRANSPORT; DENSITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
S.G. Shikaze et al., "DENSITY-DEPENDENT SOLUTE TRANSPORT IN DISCRETELY-FRACTURED GEOLOGIC MEDIA - IS PREDICTION POSSIBLE", Journal of contaminant hydrology, 34(3), 1998, pp. 273-291

Abstract

The development of a dense solute plume in a fractured geologic medium can be highly irregular due to both the complexity of the fracture network as well as the presence of convection cells that may arise as aresult of the density contrast between the invading solute and the ambient groundwater. A two-dimensional numerical model has been developed here to investigate density-dependent groundwater flow and solute transport in geologic materials that contain discrete fractures in orderto examine some of the complex forms into which plumes can evolve, particularly with regard to fracture-matrix interactions. Results from simulations which involve parallel vertical fractures show that the evolution of the solute plume is affected by the development of convection cells in the porous matrix blocks between the vertical fractures. Ina geologic medium containing a network of regularly spaced horizontaland vertical fractures, complex migration pathways can develop that are unexpected even though the geometry and interconnectivity of the fractures are known a priori. Downward solute migration can occur in some vertical fractures, while upward migration of less dense fluid can occur in others with transient circulation patterns developing in the intervening porous matrix. Because of the inherent uncertainty associated with fracture delineation, and because of the irregular nature of unstable dense plumes, deterministic prediction of dense-plume migration pathways and travel times in fractured geologic media will be subject to considerable uncertainty. (C) 1998 Elsevier Science B.V. All rights reserved.

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Documento generato il 03/12/20 alle ore 12:49:38