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4. Modeling Geologic Waste Repository Systems Below Residual Saturation.

Author

Paul, Matthew J., Park, Heeho D., Nole, Michael, and Painter, Scott L.

Abstract

The heat generated by high-level radioactive waste can pose numerical and physical challenges to subsurface flow and transport simulators if the liquid water content in a region near the waste package approaches residual saturation due to evaporation. Here, residual saturation is the fraction of the pore space occupied by liquid water when the hydraulic connectivity through a porous medium is lost, preventing the flow of liquid water. While conventional capillary pressure models represent residual saturation using asymptotically large values of capillary pressure, here, residual saturation is effectively modeled as a tortuosity effect alone. Treating the residual fluid as primarily dead-end pores and adsorbed films, relative permeability is independent of capillary pressure below residual saturation. To test this approach, PFLOTRAN is then used to simulate thermal-hydrological conditions resulting from direct disposal of a dual-purpose canister in unsaturated alluvium using both conventional asymptotic and revised, smooth models. While the two models have comparable results over 100 000 years, the number of flow steps required is reduced by approximately 94%. [ABSTRACT FROM AUTHOR]

Published
2024
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6. PFLOTRAN Development FY2022.

Author

Nole, Michael, primary, Beskardes, Gungor, additional, Fukuyama, David, additional, Leone, Rosemary, additional, Mariner, Paul, additional, Park, Heeho, additional, Paul, Matthew, additional, Salazar, Alex, additional, Hammond, Glenn, additional, and Lichtner, Peter, additional

Published
2022
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9. GDSA Framework Development and Process Model Integration FY2021

Author

Mariner, Paul, primary, Berg, Timothy, additional, Debusschere, Bert, additional, Eckert, Aubrey, additional, Harvey, Jacob, additional, LaForce, Tara, additional, Leone, Rosemary, additional, Mills, Melissa, additional, Nole, Michael, additional, Park, Heeho, additional, Perry, F., additional, Seidl, Daniel, additional, Swiler, Laura, additional, and Chang, Kyung, additional

Published
2021
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10. GDSA PFLOTRAN Development (FY2021)

Author

Nole, Michael, primary, Leone, Rosemary, additional, Park, Heeho, additional, Paul, Matthew, additional, Salazar, Alex, additional, Hammond, Glenn, additional, and Lichtner, Peter, additional

Published
2021
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12. Advances in GDSA Framework Development and Process Model Integration

Author

Mariner, Paul, primary, Nole, Michael, additional, Basurto, Eduardo, additional, Berg, Timothy, additional, Chang, Kyung, additional, Debusschere, Bert, additional, Eckert, Aubrey, additional, Ebeida, Mohamed, additional, Gross, Michael, additional, Hammond, Glenn, additional, Harvey, Jacob, additional, Jordan, Spencer, additional, Kuhlman, Kristopher, additional, LaForce, Tara, additional, Leone, Rosemary, additional, McLendon, William, additional, Mills, Melissa, additional, Park, HeeHo, additional, Perry, Frank, additional, Salazar, Alex, additional, Seidl, Daniel, additional, David, Sevougian, additional, Stein, Emily, additional, and Swiler, Laura, additional

Published
2020
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13. A numerical model for gas CO2 migration in a fault zone.

Author

Romano, Valentina, Bigi, Sabina, Park, Heeho, Valocchi, Albert J., Hyman, Jeffrey De'Haven, Karra, Satish, Nole, Michael, Hammond, Glenn, Proietti, Giampaolo, and Battaglia, Maurizio

Subjects
GAS migration, FAULT zones, WATER-gas, AQUIFERS, WATER salinization
Abstract

Understanding whether fractures and faults impact the CO2 migration through the overburden is critical in the evaluation and monitoring of CO2 geological storage sites. We present a numerical model and workflow to describe the hydraulic behaviour of a fault located in the shallow part of the overburden. This helps to evaluate the sealing potential of the system in case of unwanted CO2 migration toward the surface and to design an efficient monitoring plan. The model configuration is representative of several experiments performed at real sites under quite shallow conditions (50–500 m). The model results, applied to a selected fault outcropping in the Apennines (Italy), show that most of the gas migrates through the high permeable footwall damage zone. A significant amount of gas then dissolves into the water, emphasizing the importance of accurate modelling to assess the hazard of CO2 leakage into near-surface aquifers or to the surface. The occurrence of pressure buildup close to the fault core points out that detailed modelling of the migration conditions is required to predict gas path through a fault zone. Thematic collection: This article is part of the Fault and top seals 2022 collection available at: https://www.lyellcollection.org/topic/collections/fault-and-top-seals-2022 [ABSTRACT FROM AUTHOR]

Published
2023
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23. Progress in Deep Geologic Disposal Safety Assessment in the U.S. since 2010.

Author

Mariner, Paul, primary, Connolly, Laura A., additional, Cunningham, Leigh, additional, Debusschere, Bert, additional, Dobson, David, additional, Frederick, Jennifer M, additional, Hammond, Glenn Edward, additional, Jordan, Spencer, additional, LaForce, Tara, additional, Nole, Michael, additional, Park, HeeHo Daniel, additional, Perry, Frank, additional, Rogers, Ralph, additional, Seidl, Daniel Thomas, additional, Sevougian, Stephen David, additional, Stein, Emily, additional, Swift, Peter N., additional, Swiler, Laura Painton, additional, Vo, Jonathan, additional, and Wallace, Michael Gary, additional

Published
2019
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24. A numerical model for CO2 gas migration in a fault zone.

Author

Romano, Valentina, primary, Bigi, Sabina, additional, Park, Heeho, additional, Valocchi, Albert J., additional, Hyman, Jeffrey De'Haven, additional, Karra, Satish, additional, Nole, Michael, additional, Hammond, Glenn, additional, Proietti, Giampaolo, additional, and Battaglia, Maurizio, additional

Published
2022
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