Assessing soil surface roughness decay during simulated rainfall by multifractal analysis

Vidal-Vazquez, E, Garcia Moreno, R, Miranda, J, Diaz, M, Saa Requejo, A, Paz-Ferreiro, J and Tarquis, A 2008, 'Assessing soil surface roughness decay during simulated rainfall by multifractal analysis', Nonlinear Processes in Geophysics, vol. 15, no. 3, pp. 457-468.

Document type: Journal Article
Collection: Journal Articles

Title Assessing soil surface roughness decay during simulated rainfall by multifractal analysis
Author(s) Vidal-Vazquez, E
Garcia Moreno, R
Miranda, J
Diaz, M
Saa Requejo, A
Paz-Ferreiro, J
Tarquis, A
Year 2008
Journal name Nonlinear Processes in Geophysics
Volume number 15
Issue number 3
Start page 457
End page 468
Total pages 12
Publisher Copernicus GmbH
Abstract 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 D q 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.
Subject Agricultural Engineering
Copyright notice © Author(s) 2008
ISSN 1023-5809
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