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1.0
(a)
0.8
I = 0.25 d
α = 0.29 d -1
0.6
0.4
0.2
0.0
2
4
6
8
10
12
14
Pore Volumes
1.0
(b)
0.8
I = 0.75 d
α = 0.45 d -1
0.6
0.4
0.2
0.0
2
4
6
8
10
12
14
Pore Volumes
1.0
(c)
0.8
I = 7.0 d
α = 0.35 d -1
0.6
0.4
0.2
0.0
2
4
6
8
10
12
14
Pore Volumes
FIGURE 8.6
Breakthrough of bromide in a structured soil with flow interruptions of 0.25, 0.75, and 7 d dura-
tions. Simulations are based on the mobile-immobile model.
total water contents (Θ m /Θ) was estimated based on soil-moisture retention
relations for each soil. Selim and Amacher (1988) also assumed that the frac-
tion of sites f is the same as the relative amount of water in the two regions,
that is, f = μ (= Θ m /Θ). Such an assumption was made because independent
measurement of f is not available (van Genuchten and Dalton, 1986). Selim,
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