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Study of Gully Erosion in South Minas Gerais (Brazil) Using Fractal and Multifractal Analysis

  • Ligia de Freitas SampaioEmail author
  • Silvio Crestana
  • Valéria Guimarães Silvestre Rodrigues
Conference paper

Abstract

Tropical countries experience intense rainfall; this natural process, associated with land use, influences or accelerates soil erosion due to changes in soil properties and water flow dynamics. Gullies are an expression of soil erosion caused by water and are considered an environmental problem, since their extents and depths reach hundreds of meters, and areas of gullies frequently become unusable. Gullies are present in most states of Brazil. The case study of this paper focuses on the watershed between the Grande River and Das Mortes River (in Nazareno, southern region of Minas Gerais). There are 96 gullies in this municipality in areas where the soil has low fertility and high erodibility; the origins of these gullies are linked to vegetation removal and gold mining in the 17th century, potentialized by non-conservationist farming practices and by runoff intensification due to inadequate road drainage systems. The studied Charuteiro stream watershed has 13 gullies within a 6.55 km2 area. Therefore, we used a box-counting method with two software packages to analyze the fractality and multifractality of these gullies. The vegetated gullies presented similar values for fractal dimension, while those with bare soil presented more variability. The multifractal spectrum for each gully in the study area was obtained; these soil erosion features do not show high complexity and heterogeneity. This analysis of watersheds with intense gully erosion is a novel and promising approach, enabling mathematical modeling and recovery projects to more closely reflect reality.

Keywords

Gully Fractal Multifractal 

Notes

Acknowledgements

We acknowledge the National Council for Scientific and Technological Development (CNPq), Ph.D. scholarship process N. 141835/2015-0, for financial support. We also acknowledge the Brazilian Agricultural Research Corporation (Embrapa) and Tseng Chien Ling for their scientific support.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.São Carlos School of EngineeringUniversity of São PauloSão CarlosBrazil
  2. 2.Brazilian Agricultural Research Corporation—EmbrapaSão CarlosBrazil

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