 |
| Titel |
Multifractal analysis of 2D gray soil images |
| VerfasserIn |
Ivan González-Torres, Juan Carlos Losada, Richard Heck, Ana M. Tarquis |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250114515
|
| Publikation (Nr.) |
 EGU/EGU2015-15303.pdf |
|
|
|
|
|
| Zusammenfassung |
| Soil structure, understood as the spatial arrangement of soil pores, is one of the
key factors in soil modelling processes. Geometric properties of individual and
interpretation of the morphological parameters of pores can be estimated from thin
sections or 3D Computed Tomography images (Tarquis et al., 2003), but there is no
satisfactory method to binarized these images and quantify the complexity of their spatial
arrangement (Tarquis et al., 2008, Tarquis et al., 2009; Baveye et al., 2010). The
objective of this work was to apply a multifractal technique, their singularities (α)
and f(α) spectra, to quantify it without applying any threshold (Gónzalez-Torres,
2014).
Intact soil samples were collected from four horizons of an Argisol, formed on the
Tertiary Barreiras group of formations in Pernambuco state, Brazil (Itapirema Experimental
Station). The natural vegetation of the region is tropical, coastal rainforest. From each
horizon, showing different porosities and spatial arrangements, three adjacent samples were
taken having a set of twelve samples. The intact soil samples were imaged using an EVS
(now GE Medical. London, Canada) MS-8 MicroCT scanner with 45 μm pixel-1 resolution
(256x256 pixels). Though some samples required paring to fit the 64 mm diameter imaging
tubes, field orientation was maintained.
References
Baveye, P.C., M. Laba, W. Otten, L. Bouckaert, P. Dello, R.R. Goswami, D. Grinev, A.
Houston, Yaoping Hu, Jianli Liu, S. Mooney, R. Pajor, S. Sleutel, A. Tarquis, Wei Wang,
Qiao Wei, Mehmet Sezgin. Observer-dependent variability of the thresholding step in the
quantitative analysis of soil images and X-ray microtomography data. Geoderma, 157, 51-63,
2010.
González-Torres, Iván. Theory and application of multifractal analysis methods in images
for the study of soil structure. Master thesis, UPM, 2014.
Tarquis, A.M., R.J. Heck, J.B. Grau; J. Fabregat, M.E. Sanchez and J.M. Antón. Influence
of Thresholding in Mass and Entropy Dimension of 3-D Soil Images. Nonlinear Process in
Geophysics, 15, 881-891, 2008.
Tarquis, A.M., R.J. Heck, D. Andina, A. Alvarez and J.M. Antón. Multifractal
analysis and thresholding of 3D soil images. Ecological Complexity, 6, 230-239,
2009.
Tarquis, A.M.; D. Giménez, A. Saa, M.C. Díaz. and J.M. Gascó. Scaling and
Multiscaling of Soil Pore Systems Determined by Image Analysis. Scaling Methods in Soil
Systems. Pachepsky, Radcliffe and Selim Eds., 19-33, 2003. CRC Press, Boca Ratón,
Florida.
Acknowledgements
First author acknowledges the financial support obtained from Soil Imaging Laboratory
(University of Gueplh, Canada) in 2014. |
|
|
|
|
|
|