Statistical analysis of hydrologic data for Yucca Mountain; Yucca Mountain Site Characterization Project

Rutherford, B.M.; Hall, I.J.; Peters, R.R.; Easterling, Robert G.; Klavetter, E.A.

doi:10.2172/138373

Cited by 4 publications

(7 citation statements)

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“…Based on the fact that different methods were used in Flint and Flint (1990) it was decided not to use these data for the GW"T-95 calculations. Examination of a for the remaining references shows that in the PTn and somewhat in the TSw the mean log(a) is lower in the Peters et al (1984) and Rutherford et al (1992) data sets than those of Flint et al (1996) and Flint'l (Figure 3-7). These differences can be explained by the different sample preparation methods used in each study.…”

Section: Characteristic Curve Parametersmentioning

confidence: 90%

“…Flint, L.E., personal communication, 1995. 11. bid. Distribution of van Genuchten a for the upper three hydrogeological units (TCw, PTn and TSw) from three different sources (data for TCw were not available from Rutherford et al, 1992). Note that the approximate mean log(a's) are higher in the data from Flint et al (1996) and Flint (see footnote 10, page 29) than the other two references.…”

Section: Characteristic Curve Parametersmentioning

confidence: 98%

“…The color-scale for the hydrogeological units refers the hydrogeological unit numbers used in Table 3 Distribution of van Genuchten a for the upper three hydrogeological units (TCw, PTn and TSw) from three different sources (data for TCw were not available from Rutherford et al, 1992). Note that the approximate mean log(a's) are higher in the data from Flint et al (1996) The fault as modeled in the deterministic framework model is shown in (a).…”

Section: List Of Figuresmentioning

confidence: 99%

“…For this reason a review of the available van Genuchten parameter data was made (Table 3-4). There are four sources of data used in Wilson et al (1994) and Arnold et al (1995): Peters et al (1984), Flint and Flint (1990), Rutherford et al (1992), and Voss (1993). The data reported in Voss (1993) were later reported in Flint et al (1996) along with some additional data.…”

Section: Characteristic Curve Parametersmentioning

confidence: 99%

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Flow calculations for Yucca Mountain groundwater travel time (GWTT-95)

Altman¹,

Arnold²,

Barnard³

et al. 1996

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In 1983, high-level radioactive waste repository performance requirements related to groundwater travel time were defined by NRC subsystem regulation 10 CFR 60.113. Although the DOE is not presently attempting to demonstrate compliance with that regulation, understanding of the prevalence of fast paths in the boundwater flow system remains a critical element of any safety analyses for a potential repository system at Yucca Mountain, Nevada. Therefore, this analysis was performed to allow comparison of fast-path flow against the criteria set forth in the regulation. Models developed to describe the conditions for initiation, propagation, and sustainability of rapid groundwater movement in both the unsaturated and saturated zones will form part of the technical basis for total-system analyses to assess site viability and site licensability.This study is an enhancement of previous groundwater travel time analyses. In it the authors attempt to define the appropriate conceptual model for assessing fast-path flow. The conceptual model thus allows disequilibrium flow in the fractures and in the matrix. This conceptual model also allows for spatial and temporal variability of infiltration from the ground surface. In addition, the natural heterogeneity in hydrologic properties and the uncertainty in the values for those properties is expected to play an important role in allowing controlling rapid movement of groundwater. Because of this uncertainty in the distribution of rock properties, a probabilistic approach has been used in the unsaturated zone. Geostatistical simulation techniques, constrained by a geologic framework model, are used to create multiple realizations of the unsaturated domain. Numerical modeling of steady-state groundwater flow in these heterogeneous, two-dimensional domains is accomplished using the TOUGH2 code. A particle tracking method is used to simulate the advective and dispersive movement of groundwater in the simulated flow field and to calculate travel times from the repository to the water table. Numerical modeling of steady-state groundwater flow in the saturated zone is performed within a deterministic, three-dimensional model domain representing the upper 250 m of the saturated zone. Advective and dispersive transport are simulated by particle tracking from the water table to the five km limit of the accessible environment.The results of the groundwater flow modeling provide insights into the implications of the conceptual models employed, the sensitivity of modeling results to specific parameters and assumptions, and distributions of groundwater travel time for a set of base case calcu1,ations. Values of matrix saturation simulated by the unsaturated flow modeling compare favorably with measured matrix saturations from boreholes near the modeled cross-sections. Particle travel times in the unsaturated zone are particularly sensitive to infiltration rates, fracture-matrix connectivity, and fracture frequency. Increased infiltration rate, in concert with reduced fracturematrix co...

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Section: Characteristic Curve Parametersmentioning

confidence: 90%

Section: Characteristic Curve Parametersmentioning

confidence: 98%

Section: List Of Figuresmentioning

confidence: 99%

Section: Characteristic Curve Parametersmentioning

confidence: 99%

See 2 more Smart Citations

Flow calculations for Yucca Mountain groundwater travel time (GWTT-95)

Altman¹,

Arnold²,

Barnard³

et al. 1996

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“…Peters et al (1984) USW GU-3 and USW G-4 NA NA Voss (1993) Tiva Canyon down to Calico Hills NA For each sample, we have derived a range of water-retention curves from the original pressure-head and saturation data from Peters et al (1984), Rutherford et al (1992), Flint (1990), andVoss (1993). Prior determinations of the water-retention curves have generally produced a single curve for a hydrologic unit by averaging data taken from multiple cores from that unit.…”

Section: Pa00002mentioning

confidence: 99%

Stochastic hydrogeologic units and hydrogeologic properties development for total-system performance assessments. Yucca Mountain Site Characterization Project

Schenker¹,

Guerin

Robey

et al. 1995

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Unsaturated-zone fast-path flow calculations for Yucca Mountain groundwater travel time analyses (GWTT-94)

Arnold¹,

Altman²,

Robey³

1995

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YMSCP work is sponsored by the Office of Geologic Repositories (OGR) of the DOE Office of Civilian Radioactive Waste Management (OCRWM)." Issued by Sandia National Laboratories, operated 'for the United States Department of Energy by Sandia Corporation. NOTICE: This report was prepared as an account of work sponsored by a n agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accurac~ completeness, or useklness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe pri-' vately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government, any agency thereof or any of their contractors or subcontractors. The views and opinions expressed herein do not necessarily state or reflect those of the United States Government, any agency thereof or any of their Contractors.

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Statistical analysis of hydrologic data for Yucca Mountain; Yucca Mountain Site Characterization Project

Abstract: The data were gathered under WBS number 1.2.1.4,4; however, the report was completed under WBS n_ber 1.2.1.4.4.1.

Cited by 4 publications

References 0 publications

Flow calculations for Yucca Mountain groundwater travel time (GWTT-95)

Flow calculations for Yucca Mountain groundwater travel time (GWTT-95)

Stochastic hydrogeologic units and hydrogeologic properties development for total-system performance assessments. Yucca Mountain Site Characterization Project

Unsaturated-zone fast-path flow calculations for Yucca Mountain groundwater travel time analyses (GWTT-94)

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