Agriculture Reference
In-Depth Information
Column A
Ca -Mg
Clay
Sand
1.2
Sand
Clay
1.0
0.8
Mg
0.6
0.4
0.2
Ca
0.0
0
10
20
30
Pore Volume (V/V
o
)
FIGURE 9.12
Experimental (symbols) and simulated (dashed and solid lines) breakthrough results for tri-
tium in a Sharkey clay → sand column (column C) under different layering orders.
Based on the above presentation, the behavior of water and solutes in soils
is dependent on the layering of the soil profile. Specifically, the physical and
chemical properties of individual soil layers as well as the sequence of layer-
ing dictate the behavior of water and reactive chemicals in the soil profile.
Based on mathematical analyses and laboratory experiments, solute transport
is independent of the order of soil layers. This finding is applicable for revers-
ible and irreversible solute reactions of the equilibrium and kinetic types.
1.0
Column B
Tritium
Clay
Sand
Sand
Clay
0.8
0.6
0.4
0.2
0.0
0.0
1.0
2.0
3.0
4.0
Pore Volume (V/V
o
)
FIGURE 9.13
Experimental (symbols) and simulated (dashed and solid lines) breakthrough results for tri-
tium in a two-layered soil column (Sharkey clay → sand, column B) under different layering
orders.
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