Analysis and Design of Evapotranspirative Cover for Hazardous Waste Landfill

Zornberg, Jorge G.; LaFountain, Lester J.; Caldwell, Jack

doi:10.1061/(asce)1090-0241(2003)129:6(427)

Cited by 60 publications

(18 citation statements)

References 22 publications

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“…Cover soils with higher K s , more gradually varying K  , and a SWCC with higher air entry suction generally transmit less surface runoff and more percolation (drainage from the base of the cover) (Fayer and Gee 1997, Khire et al 2000, Roesler et al 2002, Apiwantragoon et al 2003, Zornberg et al 2003, Benson et al 2005.…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…When long-term analyses of cover hydrology are made, temporal changes in soil properties are assumed or inferred because few data exist regarding how hydraulic properties change over time (Khire et al 2000, Zornberg et al 2003, Waugh et al 1994, 1999. This paper compares hydraulic properties of cover soils measured at the time of construction and 1-4 yr after construction, provides methods to estimate changes in the hydraulic properties over time, and provides recommendations regarding cover construction methods that will minimize the propensity for change in hydraulic properties.…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…Water-balance covers (also known as store-and-release, evapotranspirative, or alternative covers) rely on a balance between precipitation, soil water storage, evaporation, and transpiration to limit percolation. Thus, WBCs function based on principles of unsaturated flow to control percolation into underlying waste [5][6][7][8]. These covers are viable for long-term isolation of waste, particularly in semi-arid and arid regions where precipitation is balanced by evaporation and transpiration.…”

Section: Introductionmentioning

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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“…Also, as evapotranspirative covers can function correctly with a reasonably broad range of soils, they are typically constructed using soils from nearby areas. The adequacy of alternative cover systems for arid locations has been acknowledged by field experimental assessments ([1] & [2]), and procedures for quantitative evaluation of the variables governing the performance of this system have been compiled in a systematic manner for final cover design [7]. Designing a truly impermeable barrier (i.e.…”

Section: Introductionmentioning

confidence: 99%

4th International Ph. D. Symposium in Civil Engineering

2002

Bautechnik

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The performance of evapotranspirative landfill covers, often used in municipal and hazardous waste disposal applications, is quantified in this study using basal percolation and soil moisture content data obtained over six years through a comprehensive field monitoring program. Specifically, this paper presents applications of soil moisture profiles and numerical modeling to verify percolation measured by a lysimeter. Inconsistencies between the recorded lysimeter percolation and the results of the moisture profile and numerical modeling analyses suggest both a potential capillary break between the lysimeter and the cover soil as well as preferential flow through isolated flow channels. Nonetheless, the utility of moisture profiles and numerical modeling is stressed. Numerical modeling using boundary conditions from meteorological data and initial conditions from moisture profiles was found to provide a realistic basecase scenario for performance assessment. Moisture profiles provide continuous feedback of cover performance without interfering with flow conditions.

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Analysis and Design of Evapotranspirative Cover for Hazardous Waste Landfill

Cited by 60 publications

References 22 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

4th International Ph. D. Symposium in Civil Engineering

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