The unsaturated hydraulic characteristics of the Bandelier Tuff

Rogers, David B.; Gallaher, B.M.

doi:10.2172/109668

Cited by 21 publications

(34 citation statements)

References 8 publications

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“…The pattern of increasing moisture content at the base of the Tshirege seen at R-15 and R-25 is also seen in Cafiada del Buey well CDBM-1 (Rogers and Gallaher 1995), at several wells at MDA G (Rogers and Gallaher, 1995;Neeper and Giikeson, 1996), in LADP-4 at TA-21 (Broxton et al 1995), and at TA-49 (Neeper and Gilkeson 1996). The occurrences of these moisture maxima probably relate to changes in pore sizes of the rock at interfaces between layers.…”

Section: Moisture Content From Boreholes R-15 R-25 and R-31mentioning

confidence: 78%

“…The moisture content profile from R-15 shows relatively high moisture contents in the Bandelier Tuff and much lower values in the underlying Cerros del Rio Basalts (Figure 4.2.1-l). The moisture content in the Otowi member is about 20Y0, corresponding to a saturation of about 53% (assuming bulk density of 1.2 g/cm3 and porosity of 45Y0, Rogers and Gallaher, 1995). Moisture content in the basalt ranges from 0.5 to 14.6%, which probably reflects Iithologies ranging from intact or vesicular basalt to fracture fill or interbedded materials.…”

Section: Moisture Content From Boreholes R-15 R-25 and R-31mentioning

confidence: 99%

See 1 more Smart Citation

Groundwater Annual Status Report for Fiscal Year 1999

Nylander¹,

Bitner²,

Henning³

et al. 2000

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Section: Moisture Content From Boreholes R-15 R-25 and R-31mentioning

confidence: 78%

Section: Moisture Content From Boreholes R-15 R-25 and R-31mentioning

confidence: 99%

Groundwater Annual Status Report for Fiscal Year 1999

Nylander¹,

Bitner²,

Henning³

et al. 2000

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“…The tuff A system follows the physical configuration and material parameters used by Nitao [1991]. The tuff B is heavily fractured, with a reported average fracture spacing of 2 m. Parameters for the tuff B system were from measured values [Rogers and Gallaher, 1995]. Tuff A capillarity is significantly greater (2-3 orders of magnitude) than that of tuff B, while tuff B porosity and permeability are much higher than those of tuff A.…”

Section: Methodsmentioning

confidence: 99%

“…All simulations were run with a 0.05 initial matrix saturation, which is the average measured in situ saturation for the specific physical system represented [Rogers and Gallaher, 1995 Two different top fracture boundary conditions were applied for the tuff B single fracture runs. In one set of simulations the IBC was applied, while in another set of simulations the PBC was applied.…”

Section: Tuff B Fracture-matrix Systemmentioning

confidence: 99%

The influence of coatings and fills on flow in fractured, unsaturated tuff porous media systems

Soll¹,

Birdsell²

1998

Water Resources Research

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Abstract. A numerical study of a single fracture embedded in a porous matrix was performed to investigate the role of fracture coatings and fills on water movement in permeable, fractured porous media. The variables considered were conductivity and continuity of fracture coatings; location, length, and conductivity of fracture fills; combinations of fills and coatings; initial matrix saturation; and inflow boundary conditions. Results from the simulations indicate that in low-saturation, high-capillarity tuff systems, the conditions under which fractures act as rapid flow paths are limited. These conditions include a continuous coating with conductivity several orders of magnitude lower than that of the neighboring matrix, and large inflow rates. However, as initial matrix saturation increases, the amount of fracture flow also increases.Discontinuities in coatings substantially reduce their effectiveness in preventing matrix imbibition. The presence of any coating, however, does produce increased infiltration depths. Fills appear to be effective barriers to fracture flow.

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“…Resulting capilkuy pressure profile for evaporation along the surge beds at the Unit 2/iv-u interface compared with infiltration alone and with data from Rogers et al (1995) for Borehole G-5. Three-dimensional stratigraphy for the vadose-zone model of Area G.…”

Section: List Of Figuresmentioning

confidence: 99%

Simulations of Groundwater Flow and Radionuclide Transport in the Vadose and Saturated Zones beneath Area G, Los Alamos National Laboratory

Birdsell¹,

Bower²,

Wolfsberg³

et al. 1999

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This report was preparedas an acconnt of work sponsoredby an agenq of the United States Government. Neither The Regents of the University of Gdifbnzia, the United States Government nor any agmq thereo~nor any of their etnpioyees,makesany warranty, express or implied, or assn?nesany legal Ziabilityor responsibilihJforthe accnracy,cotnpleteness,or ZIs#nlnessofany information, apparatus, product, or processdisclosed,or represents that its use would not iqfringe pn"vatelyowned n"ghts. R@rence herein to any specificconnnercial prodnct, process, or smvice ty trade name, tradenlark,nzamfactww-, or othenuise, does not necessars"ly wnstitute or imply its endorsement, recommendation,orfavoring by TheRegents of the U?ziversihJ of Calz@rtda,the United States Govmnnent, or any agency thereof. The views and opinions of authors expressedhereindo not necessarilystate or rflect those of TheRegents of the University of (ld~ornia, tile United States Govennnent, or any agency thereoj LOSAlamos National hboratoq strongly snpports acadetnicji-eedomand a researcher'sright to publish; as an institutiml, however, the bborafory does not endorsethe viewpoint of a publication or guarantee its technicalwrrectness.

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The unsaturated hydraulic characteristics of the Bandelier Tuff

Cited by 21 publications

References 8 publications

Groundwater Annual Status Report for Fiscal Year 1999

Groundwater Annual Status Report for Fiscal Year 1999

The influence of coatings and fills on flow in fractured, unsaturated tuff porous media systems

Simulations of Groundwater Flow and Radionuclide Transport in the Vadose and Saturated Zones beneath Area G, Los Alamos National Laboratory

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