Proposta metodológica para mapeamento da vulnerabilidade à perda de solos: estudo de caso da bacia hidrográfica do Rio Marataoan, Piauí
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2024-02-05
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Universidade Federal de Goiás
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The general objective of this research is to present a methodology for mapping
vulnerability to soil loss, improving the proposal by Crepani et. al (2001), by replacing
the “dissection index” with the parameter “shape of the slopes” (overlap of horizontal
and vertical curvatures) and the “altimetric amplitude” with the HAND model - Height
Above the Nearest Drainage. As specific objectives, the work aims to characterize the
geoenvironmental aspects of the Marataoan River watershed (geology, geomorphology,
hydrography, land use and cover, climate and soil associations); discuss the theoreticalmethodological assumptions of Crepani et.'s methodology. al (2001); test and evaluate
the proposed adaptations regarding geomorphological parameters. As main results, an
analysis of the vertical dissection of the study area was carried out through the
application of the HAND algorithm, observing that the class that stands out in the area is
the moderate one, with 40.9%, followed by the low vulnerability class, with 36.3%.
Regarding the use of Vertical and Horizontal Curvatures in the analysis of water flow
and its relationship with the intensity of rain erosion, the area highlighted the low and
high vulnerability classes, being 51.3% and 35.5% of the total surface, respectively. It
was observed that the proposed analysis model, integrating new geoenvironmental
variables, characterized in a more coherent way the possible areas of material loss by
linear erosion, in convergent areas with flow concentration, and by laminar erosion, in
divergent areas with dispersion of flow. Therefore, the parameters used to adapt the
methodology of Crepani et al. (2001) proved to be of fundamental importance in the
relationship between the environment and occurring erosion processes. Thus, the present
research is relevant to support the analysis of the erosive vulnerability of the Marataoan
river basin, in order to guide interventions by public authorities with a view to
sustainable development both in the study area studied here and in other areas to apply
the same method.
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LEAL, J. M. Proposta metodológica para mapeamento da vulnerabilidade à perda de solos: estudo de caso da bacia hidrográfica do Rio Marataoan, Piauí. 2024. 159 f. Tese (Doutorado em Geografia) - Instituto de Estudos
Socioambientais, Universidade Federal de Goiás, Goiânia, 2024.