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| Titel |
Multifractal Characteristics of Bimodal Mercury Pore Size Distribution Curves |
| VerfasserIn |
C. dos Santos Bonini, M. C. Alves, A. Paz González |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250071023
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| Zusammenfassung |
| Characterization of Hg pore size distribution (PSDs) curves by monofractal or multifractal
analysis has been demonstrated to be an useful tool, which allows a better understanding of
the organization of the soil pore space. There are also evidences that multiscale analysis of
different segments found in bimodal pore size distributions measured by Hg intrusion can
provide further valuable information. In this study we selected bimodal PSDs from samples
taken from an experimental area in São Paulo state, Brazil, where a revegetation trial was set
up over saprolitic material. The saprolite was left abandoned after decapitation of an Oxisol
for building purposes. The field trial consisted of various treatments with different grass
species and amendments. Pore size distribution of the sampled aggregates was measured in
the equivalent diameter range from 0.005 to about 50 μm and it was characterized by a
bimodal pattern, so that two compartments, i.e. 0.005 to 0.2 μm and 0.2 to 50 μm,
could be distinguished. The multifractal theory was used to analyse both segments.
The scaling properties of these two segments could be fitted reasonably well with
multifractal models. Multifractal parameters obtained for equivalent diameters for the
segments > 0.2 and < 0.2 μm showed great differences. For example, entropy
dimension, D1, values from the segment 0.005-0.2 μm were always lower than
those for the segment 0.2-50 μm form NDI , whereas the Hólder exponent of order
zero, α0, were higher for the former segment. These results indicate the probability
different degrees of heterogeneity within the Hg pore size distributions studied. |
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