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Assessing Soil Surface Roughness Decay During Simulated Rainfall by Multifractal Analysis : Volume 15, Issue 3 (23/06/2008)

By Vidal Vázquez, E.

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Book Id: WPLBN0003988288
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Assessing Soil Surface Roughness Decay During Simulated Rainfall by Multifractal Analysis : Volume 15, Issue 3 (23/06/2008)  
Author: Vidal Vázquez, E.
Volume: Vol. 15, Issue 3
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Moreno, R. G., Tarquis, A. M., V. Mirand, J. G., Vázquez, E. V., Requejo, A. S., Ferreiro, J. P., & Díaz, M. C. (2008). Assessing Soil Surface Roughness Decay During Simulated Rainfall by Multifractal Analysis : Volume 15, Issue 3 (23/06/2008). Retrieved from http://hawaiilibrary.net/


Description
Description: Facultad de Ciencias, Universidade da Coruña, Spain. 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.

Summary
Assessing soil surface roughness decay during simulated rainfall by multifractal analysis

Excerpt
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