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Type:	Artigo de Periódico
Title:	Evaluation of susceptibility for terrain collapse and subsidence in karst areas, municipality of Iraquara, Chapada Diamantina (BA), Brazil
Authors:	Lucas de Queiroz Salles Paulo Henrique Ferreira Galvão Luiz Rogério Bastos Leal Ricardo Galeno Fraga de Araujo Pereira Carlos Gleidson Campos da Purificação Fernando Verassani Laureano
Abstract:	The morphological evolution of the karstic systems is associated with a set of physical and chemical processes, triggered by the dissolution of the rocks, related to percolation of groundwater and surface water, which consequently open underground voids and carve out peculiar forms of relief. Due to environmental and geotechnical aspects, this system is naturally more fragile and vulnerable than other natural systems and, therefore, has increasingly received the attention of the scientific community over the past decades. The objective of the study was to delimit zones with varying degrees of susceptibility for collapses and subsidence of sinkholes in the municipality of Iraquara, Chapada Diamantina (BA), Brazil, and to understand their geological and morphological determinant factors. Geological data, karst phenomenon map, and visual analysis in the field were used to categorize zones with different types of susceptibilities to the nucleation of new sinkholes based on a Hazard Index. This index was defined from the sum of geological hazard factors, lineament density, and sinkhole density. The areas that presented the highest susceptibility for terrain collapse and subsidence corresponded to regions where carbon‑ ate rocks outcrop, with high density of photolineaments and 2.62 sinkholes/km2. Processes associated with terrain collapse and subsidence in karst areas consisted of a combination of various factors, hindering precise predictions. However, zones of different types of susceptibilities to terrain collapse and subsidence can be delimited when the relationships between these processes and their factors are understood. The Hazard Index proposed does not provide quantitative values for the probability of hazard susceptibility, but rather indicates areas that are more susceptible to terrain subsidence and collapse.
Subject:	Brasil Rochas carbonáticas
language:	por
metadata.dc.publisher.country:	Brasil
Publisher:	Universidade Federal de Minas Gerais
Publisher Initials:	UFMG
metadata.dc.publisher.department:	IGC - DEPARTAMENTO DE GEOLOGIA
Rights:	Acesso Aberto
metadata.dc.identifier.doi:	https://doi.org/10.1007/s12665-018-7769-8
URI:	http://hdl.handle.net/1843/52111
Issue Date:	2018
metadata.dc.url.externa:	https://link.springer.com/article/10.1007/s12665-018-7769-8
metadata.dc.relation.ispartof:	Environmental Earth Sciences
Appears in Collections:	Artigo de Periódico

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