Water Balance Modeling of Earthen Final Covers

Khire, Milind V.; Benson, Craig H.; Bosscher, Peter J.

doi:10.1061/(asce)1090-0241(1997)123:8(744)

Cited by 171 publications

(108 citation statements)

References 18 publications

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“…Hydraulic properties measured during design are often used to determine the required thickness of a water balance cover and as input to models used to predict cover hydrology (Fayer et al 1992, Khire et al 1997, Zornberg et al 2003, Benson and Chen 2003, Benson et al 2005. During design, however, hydraulic properties are typically determined on laboratory-compacted specimens and may not reflect the condition of cover soils following long-term exposure to local environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Benson

Sawangsuriya

Trzebiatowski

et al. 2007

J. Geotech. Geoenviron. Eng.

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Hydraulic properties of soils used for water balance covers measured at the time of construction and 1-4 yrs after construction are compared to assess how the hydraulic properties of cover soils change over time as a result of exposure to field conditions. Data are evaluated from ten field sites in the United States that represent a broad range of environmental conditions. The comparison shows that the saturated hydraulic conductivity (K s ) can increase by a factor of 10,000, saturated volumetric water content ( s ) by a factor of 2.0, van Genuchten's  parameter by a factor of 100, and van

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Section: Introductionmentioning

confidence: 99%

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Benson

Sawangsuriya

Trzebiatowski

et al. 2007

J. Geotech. Geoenviron. Eng.

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“…WinUNSAT-H is an implementation of the variably-saturated flow code UNSAT-H [28] used for near surface hydrology. When properly parameterized, WinUNSAT-H provides a reliable prediction of hydrology for WBCs, and modestly overpredicts percolation [26,27,29]. Water-balance modeling is typically completed for climate conditions representative of the wettest years or wettest periods (i.e., 5 to 10 sequential years) on record [2].…”

Section: Water-balance Modelingmentioning

confidence: 99%

Sustainable Reuse of Mine Tailings and Waste Rock as Water-Balance Covers

Gorakhki

Bareither

2017

Minerals

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Abstract:The focus of this study was to evaluate the potential reuse of mixed mine tailings and waste rock in water-balance covers (WBCs). Reuse of mine waste in geoengineering applications can provide an economic advantage via offsetting raw material requirements and reducing waste volumes to manage. Water-balance covers are designed to minimize percolation and/or oxygen ingress into underlying waste via moisture retention while also providing resistance against slope failure and erosion of cover materials. Water-balance simulations were conducted using a variably-saturated one-dimensional numerical model to assess hydrologic behavior of an actual WBC as well as hypothetical mixed mine waste WBCs. The actual water balance cover included a 1.22-m-thick silty-sand storage layer and a 0.15-m-thick topsoil layer. Three scenarios were evaluated via hydrologic modeling that focused on replacing the actual storage layer with a layer of mine waste: (1) storage layers were simulated as 1.22-m-thick layers of pure mine tailings (i.e., copper, gold, coal, and oil sand tailings); (2) storage layers were simulated as 1.22-m-thick layers of mixed mine tailings and waste rock; and (3) mixed mine tailings and waste rock storage layer thicknesses were redesigned to yield comparable percolation rates as the actual cover.

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“…UNSAT-H can simulate nonisothermal water flow processes in both liquid and vapor phases and hysteresis in the soil hydraulic properties. This code has been tested using data from several of the lysimeter experiments at Hanford and elsewhere Fayer and Gee 1992;Khire et al 1997;Andraski and Jacobson 2000;. Fayer and Gee (1997) tested UNSAT-H and another code and concluded that UNSAT-H provided far better estimates of drainage through a surface barrier.…”

Section: Computer Simulationmentioning

confidence: 99%

“…followed that with a simulation exercise in which the UNSAT-H prediction of lysimeter water storage after 14 years agreed with measured water storage in 1985. Khire et al (1997) tested UNSAT-H for simulating water movement in surface barrier test plots in a semiarid setting in Washington and a humid setting in Georgia. They tested the model using a 3-year record of data that included overland flow, soil water storage, evapotranspiration, and percolation.…”

Section: C22 Code Descriptionmentioning

confidence: 99%

Recharge Data Package for Hanford Single-Shell Tank Waste Management Areas

Fayer¹,

Keller²

2007

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Water Balance Modeling of Earthen Final Covers

Cited by 171 publications

References 18 publications

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Postconstruction Changes in the Hydraulic Properties of Water Balance Cover Soils

Sustainable Reuse of Mine Tailings and Waste Rock as Water-Balance Covers

Recharge Data Package for Hanford Single-Shell Tank Waste Management Areas

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