 |
| Titel |
Influence of thresholding in mass and entropy dimension of 3-D soil images |
| VerfasserIn |
A. M. Tarquis, R. J. Heck, J. B. Grau, J. Fabregat, M. E. Sanchez, J. M. Antón |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 6 ; Nr. 15, no. 6 (2008-11-25), S.881-891 |
| Datensatznummer |
250012805
|
| Publikation (Nr.) |
 copernicus.org/npg-15-881-2008.pdf |
|
|
|
|
|
| Zusammenfassung |
With the advent of modern non-destructive tomography techniques, there have
been many attempts to analyze 3-D pore space features mainly concentrating on
soil structure. This analysis opens a challenging opportunity to develop
techniques for quantifying and describe pore space properties, one of them being fractal analysis.
Undisturbed soil samples were collected from four horizons of Brazilian
soil and 3-D images at 45 μm resolution. Four different threshold
criteria were used to transform computed tomography (CT) grey-scale imagery into binary imagery
(pore/solid) to estimate their mass fractal dimension (Dm) and entropy
dimension (D1). Each threshold criteria had a direct influence on the
porosity obtained, varying from 8 to 24% in one of the samples, and on
the fractal dimensions. Linear scaling was observed over all the cube sizes,
however depending on the range of cube sizes used in the analysis, Dm
could vary from 3.00 to 2.20, realizing that the threshold influenced mainly the
scaling in the smallest cubes (length of size from 1 to 16 voxels).
Dm and D1 showed a logarithmic relation with the apparent porosity in
the image, however, the increase of both values respect to porosity defined a
characteristic feature for each horizon that can be related to soil
texture and depth. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|