Fractal Dimensions of Soil Aggregate-size Distributions Calculated by Number and Mass
- E. Perfect ,
- V. Rasiah and
- B. D. Kay
The fractal dimension, D, has been used to characterize soil aggregate-size distributions. However, D is based on the number-size relationship. In most soils applications, it is the mass-size relationship that is determined. A number-size distribution can be generated from the mass-size distribution, assuming scale-invariant shape and density. Variation in shape and density as a function of size may introduce errors in the calculation of D. We compared the fractal dimensions of soil aggregates estimated from mass-size distribution data (Dm), with those computed from actual number-size distribution data determined by counting (Dn). The fractal dimension ranged from 0.67 to 3.92 for Dn, and from 0.79 to 4.06 for Dm. A significant linear relation was found between Dm and Dn, with R2 = 0.935. The resulting intercept and slope were not significantly different from zero and one, respectively, indicating a 1:1 relationship. This implies that the assumption of scale-invariant shape and density was valid across the range of aggregate sizes studied (5.0 × 10−1 to 3.2 × 101 mm). Thus, the fractal dimension can be estimated from mass-distribution data within this range.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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