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Fig. 9.7 Distribution of the water content θ during sorption in Bungendore fine sand, as a function of
the scaled distance x / x f (or φ/φ f ), in which x f is the distance to the wetting front. The curve
and cross points represent the mean (with the standard deviations) of the measurements in
seven undisturbed field cores, and the circles are the data obtained in four repacked
cores. The respective sorptivities for the two sets of experiments were on average
A 0 = 6 . 5 × 10 4 ms 1 / 2 and A 0 = 1 . 26 × 10 3 ms 1 / 2 , and the respective positions
of the wetting front [see (9.22)] were on average φ f = 3 . 43 × 10 3 ms 1 / 2 and φ f =
4 . 45 × 10 3 ms 1 / 2 . (After Clothier and White, 1982.)
Fig. 9.8 The scaled soil water diffusivity D w / D 0 as a function of the water content θ for Bungendore
fine sand as obtained from the water content profiles shown in Figure 9.7 by means of
Equation (9.25); in this case the normalizing diffusivity D 0 is the assumed constant value, which
would produce the same sorptivity (see Equation (9.59)), and thus the same infiltration rate.
The curve and cross points represent the log mean of the results (with their standard deviations)
obtained from the
θ
profiles in the seven undisturbed field cores, and scaled with
10 6 m 2 s 1 ; the circles represent the results obtained from the profiles in the four
repacked cores and scaled with D 0 =
D 0 =
4
.
09
×
10 5 m 2 s 1 . (After Clothier and White, 1982.)
1
.
34
×
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