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Solute Transport in Layered Soils

Nonlinear and Kinetic Reactivity

Agronomy Dep., Sturgis Hall, Louisiana Agric. Exp. Station, LSU Agricultural Center, Baton Rouge, LA 70803-2110

View larger version (26K): [in a new window]   Fig. 1. Schematic diagram of a two-layered soil.

View larger version (20K): [in a new window]   Fig. 3. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a nonreactive layer and R2 is for a reactive layer with linear adsorption. Top figure is based on a first-type boundary condition (BC) at the interface between the two soil layers, whereas bottom figure is based on a combined first- and third-type BC.

View larger version (21K): [in a new window]   Fig. 2. Relative concentration versus depth for a two-layered soil (L1 = L2 = 6 cm) based on analytical solution of Leij et al. (1991) and our numerical method, at time equals 0.4 d. The solid curve and closed circles are for a first-type boundary condition (BC) at the interface between the two layers, whereas dashed curve and open circles are for a combined first- and third-type BC.

View larger version (34K): [in a new window]   Fig. 4. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a nonreactive layer and R2 is a reactive layer with nonlinear adsorption with b values (Eq. [11]) of 0.5, 0.7, 0.9, 1.25, and 1.5. The Brenner numbers, B, used were 2, 10, and 40, respectively.

View larger version (15K): [in a new window]   Fig. 5. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a nonreactive layer and R2 is for a reactive layer with Langmuir adsorption.

View larger version (17K): [in a new window]   Fig. 6. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a nonreactive layer and R2 is for a reactive layer with kinetic adsorption with n = 0.3, 0.7, and 1.0, respectively. A second-type boundary condition (BC) was used at the interface.

View larger version (16K): [in a new window]   Fig. 7. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a reactive layer with linear adsorption and R2 is for a reactive layer with first-order kinetic adsorption.

View larger version (17K): [in a new window]   Fig. 8. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a reactive layer with nonlinear adsorption and R2 is for a reactive layer with first-order kinetic adsorption.

View larger version (22K): [in a new window]   Fig. 9. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a nonreactive layer adsorption and R2 is a reactive layer with nth-order kinetic adsorption and irreversible sink.

View larger version (17K): [in a new window]   Fig. 10. Simulated breakthrough results for a two-layered soil column under different layering orders (R1R2 and R2R1). Here R1 is for a nonreactive layer and R2 is for a reactive layer with second-order kinetic adsorption.

View larger version (23K): [in a new window]   Fig. 11. Experimental (symbols) and simulated (dashed and solid lines) breakthrough results for Ca and Mg in a two-layered soil column (Sharkey claysand, column A) under different layering sequences.

View larger version (21K): [in a new window]   Fig. 12. Experimental (symbols) and simulated (dashed and solid lines) breakthrough results for tritium in a two-layered soil column (Sharkey claysand, column B) under different layering orders.

View larger version (20K): [in a new window]   Fig. 13. Experimental (symbols) and simulated (dashed and solid lines) breakthrough results for tritium in a Sharkey claysand column (column C) under different layering orders.