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A Mountain-Scale Model for Characterizing Unsaturated Flow and Transport in Fractured Tuffs of Yucca Mountain

Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720

View larger version (59K): [in a new window]   Fig. 1. Plan view of the three-dimensional unsaturated zone flow model grid, showing the model domain, faults incorporated, proposed repository layout, and several borehole locations.

View larger version (62K): [in a new window]   Fig. 2. Vertical view along an east–west cross section (E–W of Fig. 1) of the three-dimensional unsaturated zone flow model grid, showing vertical grid layers, hydrogeological units, faults, proposed repository section, and surface and water table boundaries.

View larger version (73K): [in a new window]   Fig. 3. Vertical view along a north–south cross section (N–S of Fig. 1) of the three-dimensional unsaturated zone flow model grid, showing vertical grid layers, hydrogeological units, faults, proposed repository section, and surface and water table boundaries.

View larger version (81K): [in a new window]   Fig. 4. Plan view of net infiltration distributed over the three-dimensional unsaturated zone flow model grid for the base case, or present-day, mean infiltration scenario.

View larger version (46K): [in a new window]   Fig. 5. Comparison of simulated and observed matrix liquid saturations and perched water elevations for Borehole SD-12, using the results of the simulations for base case present-day infiltration of mean, lower, and upper bounds.

View larger version (29K): [in a new window]   Fig. 6. Comparison to simulated and observed water potentials and perched water elevations for Borehole SD-12, using the results of the simulations for base case present-day infiltration of mean, lower, and upper bounds.

View larger version (33K): [in a new window]   Fig. 7. Comparison of simulated and observed Cl– concentration profiles along the ESF for present infiltration with mean, upper, and lower bounds with six flow fields (preq_uA, preq_mA, preq_lA, preq_uB, preq_mB, and preq_lB).

View larger version (31K): [in a new window]   Fig. 8. Comparison between measured and simulated Cl– concentration profiles at Borehole SD-9 for present infiltration with mean, upper, and lower bounds with six flow fields (preq_uA, preq_mA, preq_lA, preq_uB, preq_mB, and preq_lB).

View larger version (80K): [in a new window]   Fig. 9. Simulated percolation fluxes at the proposed repository horizon for base case present-day, mean infiltration using the results of simulation preq_mA.

View larger version (25K): [in a new window]   Fig. 10. Areal distribution frequency of simulated base case percolation fluxes within the proposed repository domain, normalized to the three mean infiltration rates: present day, monsoon, and glacial transition.

View larger version (35K): [in a new window]   Fig. 11. Correlation of average infiltration rates and base case groundwater travel or tracer transport times at 50% mass breakthrough for the 36 simulation scenarios for Tc and Np.