 |
| Titel |
Characterizing water fingering phenomena in soils using magnetic resonance imaging and multifractal theory |
| VerfasserIn |
A. Posadas, R. Quiroz, A. Tannús, S. Crestana, C. M. Vaz |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1023-5809
|
| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 16, no. 1 ; Nr. 16, no. 1 (2009-02-26), S.159-168 |
| Datensatznummer |
250013097
|
| Publikation (Nr.) |
 copernicus.org/npg-16-159-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| The study of water movement in soils is of fundamental importance in
hydrologic science. It is generally accepted that in most soils,
water and solutes flow through unsaturated zones via preferential
paths or fingers. This paper combines magnetic resonance imaging
(MRI) with both fractal and multifractal theory to characterize
preferential flow in three dimensions. A cubic double-layer column
filled with fine and coarse textured sand was placed into a 500
gauss MRI system. Water infiltration through the column
(0.15×0.15×0.15 m3) was recorded in steady
state conditions. Twelve sections with a voxel volume of
0.1×0.1×10 mm3 each were obtained and
characterized using fractal and multifractal theory. The MRI system
provided a detailed description of the preferential flow under
steady state conditions and was also useful in understanding the
dynamics of the formation of the fingers. The f(α)
multifractal spectrum was very sensitive to the variation
encountered at each horizontally-oriented slice of the column and
provided a suitable characterization of the dynamics of the process
identifying four spatial domains. In conclusion, MRI and fractal and
multifractal analysis were able to characterize and describe the
preferential flow process in soils. Used together, the two methods
provide a good alternative to study flow transport phenomena in
soils and in porous media. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|