PORE CONNECTIVITY, EPISODIC FLOW, AND UNSATURATED DIFFUSION IN FRACTURED TUFF

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We use an integrated approach consisting of experiments and complementary pore-scale network modeling to investigate the occurrence of sparsely connected pore spaces in rock matrices at Yucca Mountain, Nevada, and their implications for matrix diffusion. Imbibition results indicate that pore spaces in devitrified tuff are not well-connected, and that this lack of connectivity is further compounded by episodic flow in fractured devitrified tuff with low matrix permeability. A rigorous methodology for investigating chemical transport in fractured rock under episodic conditions, employing a suite of both sorbing and non-sorbing tracers (including radionuclides U-235, Np-237, and Pu-242), has been developed and implemented. ... continued below

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Hu, Q.; Ewing, R.P.; Tomutsa, L. & Singleton, M.J. February 21, 2006.

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Description

We use an integrated approach consisting of experiments and complementary pore-scale network modeling to investigate the occurrence of sparsely connected pore spaces in rock matrices at Yucca Mountain, Nevada, and their implications for matrix diffusion. Imbibition results indicate that pore spaces in devitrified tuff are not well-connected, and that this lack of connectivity is further compounded by episodic flow in fractured devitrified tuff with low matrix permeability. A rigorous methodology for investigating chemical transport in fractured rock under episodic conditions, employing a suite of both sorbing and non-sorbing tracers (including radionuclides U-235, Np-237, and Pu-242), has been developed and implemented. In addition, gas diffusion and synchrotron microtomography techniques have been under development to examine the scaling issues of diffusion and pore connectivity. Preliminary results from experiments and modeling work are presented in this paper, confirming the need to reexamine our understanding of matrix diffusion and to evaluate the impact on diffusive radionuclide retardation of episodic fracture flow and low pore connectivity.

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  • Report No.: NA
  • Grant Number: NA
  • DOI: 10.2172/884910 | External Link
  • Office of Scientific & Technical Information Report Number: 884910
  • Archival Resource Key: ark:/67531/metadc875077

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  • February 21, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 7, 2016, 7:01 p.m.

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Hu, Q.; Ewing, R.P.; Tomutsa, L. & Singleton, M.J. PORE CONNECTIVITY, EPISODIC FLOW, AND UNSATURATED DIFFUSION IN FRACTURED TUFF, report, February 21, 2006; Las Vegas, Nevada. (digital.library.unt.edu/ark:/67531/metadc875077/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.