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- W2050510332 abstract "Geometrical attributes of pore systems in soil have shown fractal scaling. Scaling in natural materials is inherently statistical, i.e., fractal dimensions may change with scale. While fractal dimensions characterizing pore surface roughness, Ds, or scaling of pore sizes, Dv, have been reported, seldom are both measurements made at more than one scale. We examine a scale effect on Dv and Ds values, and relationships between fractal dimensions of both properties. Natural and artificial types of soil structure were studied in a Normania soil. Natural soil structure was sampled from experiments involving: (l) three primary tillage tools, sampled immediately after tillage; and (2) three tillage systems, sampled after consolidation. Artificial soil structure was formed in columns packed with aggregate assemblies that included two single aggregate-size fractions, and two mixtures of six aggregate-size fractions (each covering two ranges) made to obtain fractal aggregate-size distributions. Block-like samples from all sources were resin-impregnated in situ and a face was cut and polished. Images of UV-illuminated faces were obtained at three magnifications and then pooled into two groups. A box-counting technique was applied to area and outline of pores to obtain Dv-box, and Ds-box, respectively; Ds was also calculated from area-perimeter relations (Ds-AP). Box-count data showed two segments; Dv-box and Ds-box were evaluated in relation to each segment and to Ds-AP. Coefficients of determination in the relation Ds-AP vs Ds-box were relatively low, indicating discrepancies between the two methods. Fractal dimensions were not scale-invariant. Values of Ds-box for aggregate assemblies decreased with resolution, especially for single aggregate-size fractions. Values of Dv-box were more influenced by aggregate size than resolution. Both Ds-box and Dv-box varied with resolution for freshly tilled soil. For somewhat consolidated soil, variations in values of both fractal dimensions were related to tillage systems. Values of Ds-box and Dv-box were highly correlated, with linear relations depending on magnification and type of soil structure." @default.
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- W2050510332 date "1997-05-01" @default.
- W2050510332 modified "2023-09-27" @default.
- W2050510332 title "Fractal dimensions for volume and surface of interaggregate pores — scale effects" @default.
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- W2050510332 doi "https://doi.org/10.1016/s0016-7061(97)00006-2" @default.
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