Dolinas mapping using Digital Elevation Model on the Western Edge of Chapadão Central – West of Bahia, Brazil

Authors

  • Gisele Bispo da Silva Universidade Federal de Goiás, Goiânia, Goiás, Brasil.
  • Luis Felipe Soares Cherem Universidade Federal de Goiás, Goiânia, Goiás, Brasil.
  • Ana Karolyna Nunes Amaral Universidade Federal de Goiás, Goiânia, Goiás, Brasil.

DOI:

https://doi.org/10.5216/ag.v16i1.71903

Abstract

The sinkholes are surface features indicative of the karst system that connect the surface drainage to the underground. The karst system develops mainly through the action of subsurface dissolution, with the interaction of water with carbonate rocks and some of the siliciclastic rocks. On the western side of the Chapadão Central – Western Bahia, developed on the sandstones of the Urucuia Group, these closed depressions occur, which may be linked to the karst system of sandstone dissolution. The objective is to map the sinkholes that occurred on this plateau from an algorithm already consolidated for this purpose and validating with the photo interpreted sinkholes. A total of 8,187 depressions were identified by the automatic method, 5,701 depressions after topological cleaning of the drainage network, 202 after adjusting the minimum size from 16,200 m² to 80,000 m² and photointerpreted 109 sinkholes. Of the 202 depressions automatically mapped, 43 correspond to sinkholes dispersed in the plateau and not identified in the photointerpretation and 50 correspond to errors caused by the high roughness in the DEM. The automatic mapping proved to be effective when the algorithm criteria were adjusted.

Keywords: automatic technique; geoprocessing; karst depressions.

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Published

2022-04-20

How to Cite

BISPO DA SILVA, G.; SOARES CHEREM, L. F.; NUNES AMARAL, A. K. Dolinas mapping using Digital Elevation Model on the Western Edge of Chapadão Central – West of Bahia, Brazil. Ateliê Geográfico Journal, Goiânia, v. 16, n. 1, p. 204 –, 2022. DOI: 10.5216/ag.v16i1.71903. Disponível em: https://revistas.ufg.br/atelie/article/view/71903. Acesso em: 19 dec. 2024.

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