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Titolo:
The interpretation of a tracer experiment conducted in a single fracture under conditions of natural groundwater flow
Autore:
Lapcevic, PA; Novakowski, K; Sudicky, EA;
Indirizzi:
Natl Water Res Inst, Burlington, ON L7R 4A6, Canada Natl Water Res Inst Burlington ON Canada L7R 4A6 gton, ON L7R 4A6, Canada Brock Univ, Dept Earth Sci, St Catharines, ON L2S 3A1, Canada Brock Univ St Catharines ON Canada L2S 3A1 Catharines, ON L2S 3A1, Canada Univ Waterloo, Dept Earth Sci, Waterloo, ON N2L 3G1, Canada Univ WaterlooWaterloo ON Canada N2L 3G1 ci, Waterloo, ON N2L 3G1, Canada
Titolo Testata:
WATER RESOURCES RESEARCH
fascicolo: 8, volume: 35, anno: 1999,
pagine: 2301 - 2312
SICI:
0043-1397(199908)35:8<2301:TIOATE>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSFORM GALERKIN TECHNIQUE; SOLUTE TRANSPORT; ROCK FRACTURE; MASS-TRANSPORT; CHANNEL MODEL; COEFFICIENTS; DISPERSION; DIMENSION; APERTURES; SURFACES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Engineering, Computing & Technology
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Lapcevic, PA Natl Water Res Inst, 867 Lakeshore Rd, Burlington, ON L7R 4A6, Canada Natl Water Res Inst 867 Lakeshore Rd Burlington ON Canada L7R 4A6
Citazione:
P.A. Lapcevic et al., "The interpretation of a tracer experiment conducted in a single fracture under conditions of natural groundwater flow", WATER RES R, 35(8), 1999, pp. 2301-2312

Abstract

The development of conceptual models to describe the hydrogeology of sparsely fractured media requires the characterization of the properties of discrete fractures at the field scale. In this study, a tracer experiment conducted under conditions of natural groundwater flow in a discrete fracture inan interbedded shale and limestone sequence is interpreted. This experiment, which was initiated by injecting a small quantity of tracer into the fracture plane, involved monitoring tracer movement using 27 boreholes within a 35 x 40 m area. Test data revealed a tracer plume which spread both longitudinally and transversely in the direction of mean groundwater flow. The field breakthrough curves were interpreted using a two-dimensional finite element transport model that incorporated longitudinal and transverse dispersion, diffusion into the rock matrix, and constant fracture aperture. Additional simulations which incorporated the effects of aperture variability were conducted in a Monte Carlo format by varying the spatial correlation and variance of the aperture field. The constant aperture analysis found that the mean aperture determined from the tracer experiment was approximately 20% greater than the mean aperture measured by hydraulic methods. Values of matrix porosity ranging between 1 and 3%, a constant longitudinal dispersivity of 0.1 m, and a large range in transverse dispersivity from 0.01 to 0.22m were required to simulate the data. Trends of increasing aperture and matrix porosity with distance were observed, suggesting that tracer transportfollowed increasingly tortuous pathways. Although the variable aperture simulations were not fitted to the field data, the aperture field having an isotropic spatial correlation length of 0.5 m and variance of 10,000 mu m(2)provided simulated plumes that appeared to be most similar to the shape and concentration of the field plume. Evidence from the hydraulic measurementof the aperture distribution suggests that this is a reasonable estimate of the natural aperture field.

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Documento generato il 03/12/20 alle ore 05:36:12