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Interpretation of Dye Transport in a Macroscopically Heterogeneous, Unsaturated Subsoil with a One-Dimensional Model

^a Dep. of Environmental Sciences and Land Use Planning, Université catholique de Louvain (UCL), Croix du Sud, 2 Bte 2, B-1348 Louvain-la-Neuve, Belgium
^b Agrosphere, ICG-IV, Forschungszentrum Jülich, D-52425 Jülich, Germany

View larger version (15K): [in a new window]   Fig. 1. Observed adsorption isotherm (triangles) with optimal Langmuir model (line).

View larger version (18K): [in a new window]   Fig. 2. Sorbed concentration dynamics for two Brilliant Blue concentrations: 10 (red squares) and 1000 mg L–1 (blue squares).

View larger version (22K): [in a new window]   Fig. 3. Average observed water content by TDR probes under steady-state conditions (squares) and soil cores water content after drainage (crosses). Green open squares show the outliers. Continuous and dashed red lines are the simulated water content profile respectively at steady state and after drainage; continuous and dashed blue lines are the effective water content profiles at steady state and after drainage, respectively (see text for explanations).

View larger version (66K): [in a new window]   Fig. 4. Brilliant Blue lognormal concentration at 12 depths. The TDR probes are drawn in red, tensiometers in gray. Profile 1 corresponds to the bottom right-hand probes, Profile 2 to the upper probes, and Profile 3 to the left-hand bottom probes.

View larger version (17K): [in a new window]   Fig. 5. Observed (continuous blue line) and simulated (dashed lines) Brilliant Blue (BB) total concentration profiles considering convection–dispersion (CDE) with equilibrium (Scenario 1, in red), CDE with nonequilibrium sorption sites (Scenario 2, in green), two-site sorption (Scenario 3, in black), CDE with effective water contents and instantaneous sorption (Scenario 4, in cyan), and CDE with effective water contents and noninstantaneous, two-site sorption (Scenario 5, in magenta). The clay layer is shown in gray.

View larger version (30K): [in a new window]   Fig. 6. Mass fraction of the Brillian Blue concentration distribution at different slices versus area fraction. The dashed black line represents a homogeneous distribution.

View larger version (24K): [in a new window]   Fig. 7. Directional variograms with angles of 0° (green), 45° (red), and 90° (blue) for the upper concentration image at z = 0 cm.