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Titolo:
Flow and transport in fractured tuff at Yucca Mountain: numerical experiments on fast preferential flow mechanisms
Autore:
McLaren, RG; Forsyth, PA; Sudicky, EA; VanderKwaak, JE; Schwartz, FW; Kessler, JH;
Indirizzi:
Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada Univ WaterlooWaterloo ON Canada N2L 3G1 ci, Waterloo, ON N2L 3G1, Canada Univ Waterloo, Dept Comp Sci, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 ci, Waterloo, ON N2L 3G1, Canada Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 Environm Sci, Stanford, CA 94305 USA Ohio State Univ, Dept Geol Sci, Columbus, OH 43210 USA Ohio State Univ Columbus OH USA 43210 pt Geol Sci, Columbus, OH 43210 USA Elect Power Res Inst, Palo Alto, CA USA Elect Power Res Inst Palo Alto CAUSA Power Res Inst, Palo Alto, CA USA
Titolo Testata:
JOURNAL OF CONTAMINANT HYDROLOGY
fascicolo: 3-4, volume: 43, anno: 2000,
pagine: 211 - 238
SICI:
0169-7722(200005)43:3-4<211:FATIFT>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
NAPL GROUNDWATER CONTAMINATION; SCHEMES; WASTE; ROCK; GAS;
Keywords:
unsaturated zone; fracture-matrix interaction; numerical modeling; dual permeability; fast preferential flow; Yucca Mountain;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: McLaren, RG Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 , ON N2L 3G1, Canada
Citazione:
R.G. McLaren et al., "Flow and transport in fractured tuff at Yucca Mountain: numerical experiments on fast preferential flow mechanisms", J CONTAM HY, 43(3-4), 2000, pp. 211-238

Abstract

Recent discovery of bomb-related Cl-36 at depth in fractured tuff in the unsaturated zone at the Yucca Mountain candidate high-level waste (HLW) repository site has called into question the usual modeling assumptions based on the equivalent continuum model (ECM). A dual continuum model (DCM) for simulating transient flow and transport at Yucca Mountain is developed. In order to ensure properly converged flow solutions, which an used in the transport simulation, a new flow solution convergence criteria is derived. An extensive series of simulation studies is presented which indicates that rapid movement of solute through the fractures will not occur unless there are intense episodic infiltration events. Movement of solute in the environs ofthe repository is enhanced if the properties of the tuff layer at the repository horizon are modified from current best-estimate values. Due to a large advective-dispersive coupling between the matrix and fractures, the matrix acts as a major buffer which inhibits rapid transport along the fractures. Consequently, fast movement of solutes through the fractures to the repository depth can only be explained if the matrix-fracture coupling term is significantly reduced from a value that would be calculated on the basis ofdata currently available. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 05:30:35