A simulation study of moisture movement in proposed barriers for the subsurface disposal area, INEL

Magnuson, S.O.

doi:10.2172/10134757

Cited by 14 publications

(21 citation statements)

References 1 publication

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“…The average wind speed for the periods 1950-1954 and 1971-1981 and the dewpoint data were obtained from the NOAA weather station located at the Pocatello airport. Magnuson (1993) found a good correlation between weather parameters measured at the Pocatello airport and at the CFA.…”

Section: Boundary Conditionsmentioning

confidence: 58%

“…Specifically, the code has the ability to account for (a) liquid and vapor water movement, (b) heat transfer by conduction and convection, (c) evaporation at the soil surface, and (d) transpiration by plants. The UNSAT-H code was verified and benchmarked by Baca and Magnuson (1990) and was successfully applied to simulate moisture transport at several semi-arid locations (Fayer et al, 1992;Baca et al, 1992;Magnuson, 1993;Martian and Magnuson, 1993).…”

Section: Selected Modelmentioning

confidence: 99%

“…Because the daily precipitation records collected at the NOAA weather station included all forms of precipitation including both rain and snow, the precipitation amounts were modified during the winter months to account for snow accumulation and melting following the method outlined in Magnuson (1993). The results of this modification were to concentrate winter precipitation into a short period of snowmelt each spring.…”

Section: Boundary Conditionsmentioning

confidence: 99%

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UNSAT-H infiltration model calibration at the Subsurface Disposal Area, Idaho National Engineering Laboratory

Martian¹

1995

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Section: Boundary Conditionsmentioning

confidence: 58%

Section: Selected Modelmentioning

confidence: 99%

Section: Boundary Conditionsmentioning

confidence: 99%

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UNSAT-H infiltration model calibration at the Subsurface Disposal Area, Idaho National Engineering Laboratory

Martian¹

1995

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“…me code has also been used elsewhere to evaluate infiltration through surface covers (Magnuson 1993) and surfIcial sediments (Martian and Magnuson 1994).…”

Section: C4mentioning

confidence: 99%

Recharge Data Package for the Immobilized Low-Activity Waste 2001 Performance Assessment

Fayer¹,

Murphy²,

Downs³

et al. 2000

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“…The code has also been used elsewhere to evaluate infiltration through surface covers (Magnuson 1993) and surficial sediments (Martian and Magnuson 1994).…”

Section: C5mentioning

confidence: 99%

Performance Assessment

1999

International Oil Spill Conference Proceedings

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SummaryLockheed Martin Hanford Company (LMHC) is designing and assessing the performance of disposal facilities to receive radioactive wastes that are currently stored in single -and double -shell tanks at the Hanford Site. The preferred method of disposing of the portion that is classified as immobilized lowactivity waste (ILAW) is to vitrify the waste and place the product in near-surface, shallow-land burial facilities. The LMHC project to assess the performance of these disposal facilities is known as the Hanford ILAW Performance Assessment (PA) Activity, hereafter called the ILAW PA project. The goal of this project is to provide a reasonable expectation that the disposal of the waste is protective of the general public, groundwater resources, air resources, surface-water resources, and inadvertent intruders. Achieving this goal will require predictions of contaminant migration from the facility. To make such predictions will require estimates of the fluxes of water moving through the sediments within the vadose zone around and beneath the disposal facility. These fluxes, loosely called recharge rates, are the primary mechanism for transporting contaminants to the groundwater.Pacific Northwest National Laboratory (PNNL) assists LMHC in their performance assessment activities. One of the PNNL tasks is to provide estimates of recharge rates for current conditions and long-term scenarios involving the shallow-land disposal of ILAW. Specifically, recharge estimates are needed for a fully functional surface cover, the cover sideslope, and the immediately surrounding terrain. In addition, recharge estimates are needed for degraded cover conditions. The temporal scope of the analysis is 10,000 years, but could be longer if some contaminant peaks occur after 10,000 years.The elements of this report compose the Recharge Data Package, which provides estimates of recharge rates for the scenarios being considered in the 2001 PA. Table S.1 identifies the surface features and time periods evaluated. The most important feature, the surface cover, is expected to be the modified RCRA Subtitle C design. This design uses a 1-m-thick silt loam layer above sand and gravel filter layers to create a capillary break. A 0.15-m-thick asphalt layer underlies the filter layers to function as a backup barrier and to promote lateral drainage. Cover sideslopes are expected to be constructed with 1V:10H slopes using sandy gravel. The recharge estimates for each scenario were derived from lysimeter and tracer data collected by the ILAW PA and other projects and from modeling analyses.For the best estimate case, we proposed using a recharge rate of 0.1 mm/yr for the surface cover with a shrub-steppe plant community. This rate is lower than the cover design goal of 0.5 mm/yr because it is closer to the actual drainage rate measured with lysimeters and inferred with modeling. The simulation results showed that erosion of 20% of the silt loam layer did not impair this performance nor did the deposition of 20 cm of dune sand. For the sandy grav...

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A simulation study of moisture movement in proposed barriers for the subsurface disposal area, INEL

Cited by 14 publications

References 1 publication

UNSAT-H infiltration model calibration at the Subsurface Disposal Area, Idaho National Engineering Laboratory

UNSAT-H infiltration model calibration at the Subsurface Disposal Area, Idaho National Engineering Laboratory

Recharge Data Package for the Immobilized Low-Activity Waste 2001 Performance Assessment

Performance Assessment

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