Field Lysimeter Test Facility: Protective barrier test results (FY 1990, the third year)

Campbell, D. M.; Gee, G.W.

doi:10.2172/6161790

Cited by 5 publications

(3 citation statements)

References 1 publication

(1 reference statement)

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“…The FLTF has been operated for 17 yr and yielded a significant quantity of data (e.g., Campbell et al, 1990; Campbell and Gee, 1990; Gee et al, 1989, 1993; Fayer et al, 1999; Fayer and Szecsody, 2004). Summarized below are some of the weather, irrigation, vegetation, matric head, and drainage data.…”

Section: Resultsmentioning

confidence: 99%

“…Small quantities of drainage observed in some lysimeters before 1990 were not included in the drainage averages in Table 3 because water from leak testing (Campbell and Gee, 1990) could not be separated from actual drainage. In the years since then, no water has drained from vegetated Hanford Barrier lysimeters.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7 shows the late‐summer to fall drainage amounts are quite variable. This anomalous drainage was attributed to vapor flow (Campbell and Gee, 1990). As it penetrated the underlying cooler sands and gravels, the vapor condensed and eventually led to drainage.…”

Section: Resultsmentioning

confidence: 99%

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Multiple‐Year Water Balance of Soil Covers in a Semiarid Setting

Fayer

Gee

2006

J of Env Quality

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Surface covers are used to isolate contaminants in hazardous and low-level radioactive sites for time frames ranging from hundreds of years to millennia or more. In the absence of data for such durations, the long-term performance of surface barriers can only be represented with short-term tests or inferred from analogs and modeling. This paper provides evidence of field performance of soil covers for periods up to 17 yr. The results of lysimeter studies from a semiarid site in Washington State show that a cover design known as the Hanford Barrier, which consists of 1.5 m of silt loam above a sand-gravel capillary break, can nearly eliminate drainage. The results were similar if plants were present or not, demonstrating the robustness of the design. Furthermore, reducing the silt loam thickness to 1.0 m (as might occur via erosion), with or without plants, did not lead to drainage. When irrigated to mimic 3x average precipitation conditions, the vegetated Hanford Barrier continued to prevent drainage. Overall, the results showed no loss in performance during the 17 yr of testing. Only when plants were eliminated completely from the 3x precipitation test did drainage occur (rates ranged from 6 to 16 mm yr(-1)). In a separate test, replacing the top 0.2 m of silt loam with dune sand and reducing the plant cover did not lead immediately to the onset of drainage, but soil matric heads within the silt loam noticeably increased. This observation suggests that dune sand migration onto a surface cover has the potential to reduce a cover's ability to minimize deep drainage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Multiple‐Year Water Balance of Soil Covers in a Semiarid Setting

Fayer

Gee

2006

J of Env Quality

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Beyond the semivariogram: Patterns, scale, and hydrology in a semi-arid landscape

Hoover

Wolman

2005

Advances in Water Resources

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Application of a continuous‐flow centrifugation method for solute transport in disturbed, unsaturated sediments and illustration of mobile‐immobile water

Gamerdinger¹,

Kaplan²

2000

Water Resources Research

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Abstract. A centrifuge method was adapted for evaluating solute transport during steady state flow. Solute breakthrough curves were obtained on three sediment types at average water contents ranging from 14 to 84% moisture saturation. Interruptions in flow for sampling, a potential limitation of the method, had no apparent effect on breakthrough curves for the tracers and conditions evaluated. Compaction was observed for a silt loam sediment but was not observed for fine and coarse sand sediments. Regions of immobile water developed with decreasing moisture saturation; these results extend the range of previous reports. The continuum from a single to a multiregion flow domain was illustrated, and a modeling approach for estimating dispersion and mobile-immobile water parameters was applied. The fraction of immobile water ranged from 48 to 80%; solute velocity in the mobile domain was up to fivefold greater than the average pore water velocity.

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Field Lysimeter Test Facility: Protective barrier test results (FY 1990, the third year)

Cited by 5 publications

References 1 publication

Multiple‐Year Water Balance of Soil Covers in a Semiarid Setting

Multiple‐Year Water Balance of Soil Covers in a Semiarid Setting

Beyond the semivariogram: Patterns, scale, and hydrology in a semi-arid landscape

Application of a continuous‐flow centrifugation method for solute transport in disturbed, unsaturated sediments and illustration of mobile‐immobile water

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