DCM3D: A dual-continuum, three-dimensional, ground-water flow code for unsaturated, fractured, porous media

Updegraff, C.D.; Lee, C.E.; Gallegos, D.P.

doi:10.2172/5990808

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…In each case, the hcture/matrix coupling equation was essentially taken to be of the Warren-Root form, in that the volumetric rate of flux depends linearly of the difference between the fracture potential and the mean potential in the matrix block. In the code DCM3D (Updegraff et al, 1991), the fracture network and matrix rock were assumed to behave as two interpenetrated continua, each governed by a macroscopic pressure diffusion equation. The source/sink terms for the two continua were assumed to be equal in magnitude, but opposite in sign.…”

Section: Peters and Klavetter (1988) Developed A Numerical Model For mentioning

confidence: 99%

Transient dual-porosity simulations of unsaturated flow in fractured rocks

Zimmerman¹,

Hadgu²,

Bodvarsson³

1995

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DISCLAIMER ABSTRACTThis report describes the development and use of a semi-analytical dual-porosity simulator for unsaturated flow in fractured rock masses. Fluid flow between the fracture network and the matrix blocks is described by a nonlinear equation that relates the imbibition rate to the local difference in liquid-phase pressure between the fractures and the matrix blocks. This equation is a generalization of the Warren-Root equation, but is accurate in both early and late time regimes. The fracture/matrix interflow equation has been incorporated into a computational module that acts as a source/sink term for fracture elements; this module is compatible with the unsaturated flow simulator TOUGH. Flow processes are then simulated using only fracture elements in the computational grid. This semi-analytical dual-porosity module has been tested with TOUGH on various problems involving transient flow in fracturedporous media, and compared with simulations performed using explicit discretization of the matrix blocks. The new semi-analytical dual-porosity model accurately simulates flow processes in unsaturated fractured rocks, and typically requires an order of magnitude less computational time than do simulations using fully-discretized matrix blocks.

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Section: Peters and Klavetter (1988) Developed A Numerical Model For mentioning

confidence: 99%

Transient dual-porosity simulations of unsaturated flow in fractured rocks

Zimmerman¹,

Hadgu²,

Bodvarsson³

1995

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“…The computer code DCM3D (Updegraff et al, 1991) was used to model the effect of selected drift backfill in controlling water flow in drifts. DCM3D models groundwater flow in a variably saturated, fractured, porous media.…”

Section: E31 Approachmentioning

confidence: 99%

Initial field testing definition of subsurface sealing and backfilling tests in unsaturated tuff; Yucca Mountain Site Characterization Project

Fernández

Case²,

Tyburski³

1993

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This report contains an initial definition of the field tests proposed for the Yucca Mountain Project repository sealing program.The tests are intended to resolve various performance and emplacement concerns.Examples of concerns to be addressed include achieving selected hydrologic and structural requirements for seals, removing portions of the shaft liner, excavating keyways, emplacing cementitious and earthen seals, reducing the impact of fines on the hydraulic conductivity of fractures, efficient grouting of fracture zones, sealing of exploratory boreholes, and controlling the flow of water by using engineered designs. Ten discrete tests are proposed to address these and other concerns. These tests are divided into two groups: seal component tests and performance confirmation tests. The seal component tests are the small-scale in situ tests, the intermediate-scale borehole seal tests, the fracture grouting tests, the surface backfill tests, and the grouted rock mass tests. The seal system tests are the seepage control tests, the backfill tests, the bulkhead test in the Calico Hills unit, the large-scale shaft seal and shaft fill tests, and the remote borehole sealing tests. The tests are proposed to be performed in six discrete areas, including welded and nonwelded environments, primarily located outside the potential repository area. The final selection of sealing tests will depend on the nature of the geologic and hydrologic conditions encountered during the development of the Exploratory Studies Facility and detailed numerical analyses. Tests are likely to be performed both before and after License Application.

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“…DCM3D also produces an output plot file that can be processed to provide transport paths and transport velocities for the geosphere radionuclide transport model. For more details about the DCM3D computer code see Updegraff et al [1991].…”

Section: Ground Water Flow Modelmentioning

confidence: 99%

A performance assessment methodology for high-level radioactive waste disposal in unsaturated, fractured tuff

Gallegos¹

1991

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DCM3D: A dual-continuum, three-dimensional, ground-water flow code for unsaturated, fractured, porous media

Cited by 8 publications

References 9 publications

Transient dual-porosity simulations of unsaturated flow in fractured rocks

Transient dual-porosity simulations of unsaturated flow in fractured rocks

Initial field testing definition of subsurface sealing and backfilling tests in unsaturated tuff; Yucca Mountain Site Characterization Project

A performance assessment methodology for high-level radioactive waste disposal in unsaturated, fractured tuff

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