Numerical simulation of gas flow through unsaturated fractured rock at Yucca Mountain, Nevada

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Numerical analysis is used to identify the physical phenomena associated with barometrically driven gas (air and water vapor) flow through unsaturated fractured rock at Yucca Mountain, Nevada. Results from simple finite difference simulations indicate that for a fractured rock scenario, the maximum velocity of air out of an uncased 10 cm borehole is 0.002 m s{sub {minus}1}. An equivalent porous medium (EPM) model was incorporated into a multiphase, multicomponent simulator to test more complex conceptual models. Results indicate that for a typical June day, a diurnal pressure wave propagates about 160 m into the surrounding Tiva Canyon hydrogeologic unit. Dry ... continued below

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81 p.

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Cooper, C.A. January 1, 1990.

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  • Cooper, C.A. Nevada Univ., Las Vegas, NV (United States). Water Resources Center

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Description

Numerical analysis is used to identify the physical phenomena associated with barometrically driven gas (air and water vapor) flow through unsaturated fractured rock at Yucca Mountain, Nevada. Results from simple finite difference simulations indicate that for a fractured rock scenario, the maximum velocity of air out of an uncased 10 cm borehole is 0.002 m s{sub {minus}1}. An equivalent porous medium (EPM) model was incorporated into a multiphase, multicomponent simulator to test more complex conceptual models. Results indicate that for a typical June day, a diurnal pressure wave propagates about 160 m into the surrounding Tiva Canyon hydrogeologic unit. Dry air that enters the formation evaporates water around the borehole which reduces capillary pressure. Multiphase countercurrent flow develops in the vicinity of the hole; the gas phase flows into the formation while the liquid phase flows toward the borehole. The effect occurs within 0.5 m of the borehole. The amount of water vapor leaving the formation during 1 day is 900 cm{sup 3}. This is less than 0.1% of the total recharge into the formation, suggesting that the barometric effect may be insignificant in drying the unsaturated zone. However, gas phase velocities out of the borehole (3 m s{sup {minus}1}), indicating that observed flow rates from wells along the east flank of Yucca Mountain were able to be simulated with a barometric model.

Physical Description

81 p.

Notes

INIS; OSTI as DE93013213

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  • Other Information: PBD: Jan 1990

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  • Other: DE93013213
  • Report No.: NWPO-TR--014-90
  • Grant Number: FG08-85NV10461
  • DOI: 10.2172/139152 | External Link
  • Office of Scientific & Technical Information Report Number: 139152
  • Archival Resource Key: ark:/67531/metadc618558

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1990

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  • June 16, 2015, 7:43 a.m.

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  • Nov. 24, 2015, 6:31 p.m.

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Cooper, C.A. Numerical simulation of gas flow through unsaturated fractured rock at Yucca Mountain, Nevada, report, January 1, 1990; United States. (digital.library.unt.edu/ark:/67531/metadc618558/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.