Effects of Diffusive Property Heterogeneity on Effective MatrixDiffusion Coefficient for Fractured Rock

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Heterogeneities of diffusion properties are likely toinfluence the effective matrix diffusion coefficient determined fromtracer breakthrough curves. The objectives of this study are (1) toexamine if it is appropriate to use a single, effective matrix diffusioncoefficient to predict breakthrough curves in a fractured formation, (2)to examine if a postulated scale dependence of the effective matrixdiffusion coefficient is caused by heterogeneity in diffusion properties,and (3) to examine whether multirate diffusion results in the previouslyobserved time dependence of the effective matrix diffusion coefficient.The results show that the use of a single effective matrix diffusioncoefficient is appropriate only if the interchannel and intrachannelvariability of ... continued below

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Zhang, Yingqi; Liu, Hui-hai; Zhou, Quanlin & Finsterle, Stefan August 16, 2005.

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Heterogeneities of diffusion properties are likely toinfluence the effective matrix diffusion coefficient determined fromtracer breakthrough curves. The objectives of this study are (1) toexamine if it is appropriate to use a single, effective matrix diffusioncoefficient to predict breakthrough curves in a fractured formation, (2)to examine if a postulated scale dependence of the effective matrixdiffusion coefficient is caused by heterogeneity in diffusion properties,and (3) to examine whether multirate diffusion results in the previouslyobserved time dependence of the effective matrix diffusion coefficient.The results show that the use of a single effective matrix diffusioncoefficient is appropriate only if the interchannel and intrachannelvariability of diffusion properties is small. The scale dependence of theeffective matrix diffusion coefficient is not caused by the studied typesof heterogeneity. Finally, the multirate diffusion process does notresult in the time dependence of the effective matrix diffusioncoefficient. oefficient is appropriate only if the inter- andintrachannel variability of diffusion properties is small. The scaledependence of the effective matrix diffusion coefficient is not caused byeither type of the studied heterogeneity. Finally, the multi-ratediffusion process does not result in the time dependence of the effectivematrix diffusion coefficient.

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  • Journal Name: Water Resources Research; Journal Volume: 42; Related Information: Journal Publication Date: 11 April2006

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  • Report No.: LBNL--58695
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 895797
  • Archival Resource Key: ark:/67531/metadc886209

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  • August 16, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Sept. 29, 2016, 2:28 p.m.

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Zhang, Yingqi; Liu, Hui-hai; Zhou, Quanlin & Finsterle, Stefan. Effects of Diffusive Property Heterogeneity on Effective MatrixDiffusion Coefficient for Fractured Rock, article, August 16, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc886209/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.