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Surface Water–Groundwater Connection at the Los Alamos Canyon Weir Site

Part 2. Modeling of Tracer Test Results

Los Alamos National Laboratory Earth and Environmental Science Division Hydrology, Geochemistry, and Geology EES-6, Los Alamos, NM 87545

View larger version (37K): [in a new window]   Fig. 1. Schematic of the experimental setup. This figure portrays a vertical slice perpendicular to the weir at the location of the monitoring boreholes. Monitoring Ports 1 through 4 are shown as red circles on LAWS-01 (from Levitt et al., 2005).

View larger version (22K): [in a new window]   Fig. 2. Bromide concentration vs. time from LAWS-01. Time zero corresponds to 22 June 2002. Missing data from Ports 1 and 2 at late times is caused by the ports going dry.

View larger version (26K): [in a new window]   Fig. 3. Schematic of model domain with boundary conditions.

View larger version (19K): [in a new window]   Fig. 4. Pond depths recorded behind the weir for the four events. Because the last two events were closely spaced in time, they were combined as a single event for the conceptual and numerical modeling.

View larger version (13K): [in a new window]   Fig. 5. Simulated water pressure vs. saturation.

View larger version (50K): [in a new window]   Fig. 6. Comparison of bromide data and simulated bromide concentrations at the sampling ports in Simulations S-1, S-2, S-3, and S-4. Simulation specific parameters are shown in Table 5.

View larger version (76K): [in a new window]   Fig. 7. Saturation in the model domain as a function of time for Simulation S-3. In this figure, the simulated Borehole LAWS-01 lies at x = 25 m, while Ports 1 through 4 are located at elevations of z = 76.5, 54, 44.5, and 22 m, respectively. The approximate locations of the ports are marked on the images as white circles.

View larger version (56K): [in a new window]   Fig. 8. Bromide concentration in the model domain as a function of time. Results are for Simulation S-3. Maximum initial concentrations in the simulations are more than 10000 mg kg–1; however, the color bar has been truncated at 40 mg kg–1 to more clearly show the growth of the plume. In this figure, the simulated borehole LAWS-01 lies at x = 25 m, while Ports 1 through 4 are located at elevations of z = 76.5, 54, 44.5, and 22 m, respectively. The approximate locations of the ports are marked on the images as black circles.