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| Titel |
Assessing soil surface roughness decay during simulated rainfall by multifractal analysis |
| VerfasserIn |
E. Vidal Vázquez, R. García Moreno, J. G. V. Miranda, M. C. Diaz, Antonio Saa Requejo, J. Paz Ferreiro, A. M. Tarquis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 3 ; Nr. 15, no. 3 (2008-06-23), S.457-468 |
| Datensatznummer |
250012661
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| Publikation (Nr.) |
 copernicus.org/npg-15-457-2008.pdf |
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| Zusammenfassung |
| Understanding and describing the spatial characteristics of soil surface
microrelief are required for modelling overland flow and erosion. We
employed the multifractal approach to characterize topographical point
elevation data sets acquired by high resolution laser scanning for assessing
the effect of simulated rainfall on microrelief decay. Three soil surfaces
with different initial states or composition and rather smooth were prepared
on microplots and subjected to successive events of simulated rainfall. Soil
roughness was measured on a 2×2 mm2 grid, initially, i.e. before
rain, and after each simulated storm, yielding a total of thirteen data sets
for three rainfall sequences. The vertical microrelief component as
described by the statistical index random roughness (RR) exhibited minor
changes under rainfall in two out of three study cases, which was due to the
imposed wet initial state constraining aggregate breakdown. The effect of
cumulative rainfall on microrelief decay was also assessed by multifractal
analysis performed with the box-count algorithm. Generalized dimension,
Dq, spectra allowed characterization of the spatial variation of soil
surface microrelief measured at the microplot scale. These Dq spectra
were also sensitive to temporal changes in soil surface microrelief, so that
in all the three study rain sequences, the initial soil surface and the
surfaces disturbed by successive storms displayed great differences in their
degree of multifractality. Therefore, Multifractal parameters best
discriminate between successive soil stages under a given rain sequence.
Decline of RR and multifractal parameters showed little or no association. |
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