Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil.
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFOP |
Texto Completo: | http://www.repositorio.ufop.br/handle/123456789/4349 https://doi.org/10.1016/j.catena.2006.05.007 |
Resumo: | The baseflow of tributaries to the Velhas River in the northwest region of Ouro Preto County (São Francisco Basin, Brazil) has been declining in the last years, without a simultaneous decrease in the water input. This can only be attributed to badly planned human activities, which result in soil crusting or compaction, erosion, among other types of impact, such as groundwater overexploitation and wetland drainage. Almost all of the study area has been eroded by hundreds of large-size gullies. In order to analyze the influence of erosion in the hydrological behavior of small streams, two similar and contiguous catchments were selected. The only remarkable difference between them is a gully that occupies circa 42% of one of the catchments (“eroded catchment”). Rainfall, flow rates and chemical data were obtained throughout a hydrological year and the results showed that the eroded catchment presented smaller baseflow rates and bigger but short-lived stormflows. This contrasting flow regime is attributed to the gully, which is causing the partial withdraw of the regolith and the exposure of weathered rock. As the regolith has smaller hydraulic conductivities and higher storage coefficients, the exposure of weathered rock on the gully floor explains the odd flow behavior of the eroded catchment. Other studies in the same region confirm the impact caused by the gullies. Thus, the superposition of many gullies can cause decrease of the baseflow and increase of the stormflow. As gullies are very common erosion features in Brazil, they should be much more studied in order to better understand this and other similar types of environmental impact. |
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Costa, Fernanda MartineliBacellar, Luis de Almeida Prado2015-01-22T15:11:48Z2015-01-22T15:11:48Z2007COSTA, F. M.; BACELLAR, L. de A. P. Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. CATENA, v. artcle, p. 230-238, 2007. Disponível em: <http://www.sciencedirect.com/science/article/pii/S034181620600124X>. Acesso em: 30 set. 2014.0341-8162http://www.repositorio.ufop.br/handle/123456789/4349https://doi.org/10.1016/j.catena.2006.05.007The baseflow of tributaries to the Velhas River in the northwest region of Ouro Preto County (São Francisco Basin, Brazil) has been declining in the last years, without a simultaneous decrease in the water input. This can only be attributed to badly planned human activities, which result in soil crusting or compaction, erosion, among other types of impact, such as groundwater overexploitation and wetland drainage. Almost all of the study area has been eroded by hundreds of large-size gullies. In order to analyze the influence of erosion in the hydrological behavior of small streams, two similar and contiguous catchments were selected. The only remarkable difference between them is a gully that occupies circa 42% of one of the catchments (“eroded catchment”). Rainfall, flow rates and chemical data were obtained throughout a hydrological year and the results showed that the eroded catchment presented smaller baseflow rates and bigger but short-lived stormflows. This contrasting flow regime is attributed to the gully, which is causing the partial withdraw of the regolith and the exposure of weathered rock. As the regolith has smaller hydraulic conductivities and higher storage coefficients, the exposure of weathered rock on the gully floor explains the odd flow behavior of the eroded catchment. Other studies in the same region confirm the impact caused by the gullies. Thus, the superposition of many gullies can cause decrease of the baseflow and increase of the stormflow. As gullies are very common erosion features in Brazil, they should be much more studied in order to better understand this and other similar types of environmental impact.GullyCatchment streamsBaseflowFlow patternAnalysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil.info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleO periódico CATENA concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3481460771058.info:eu-repo/semantics/openAccessengreponame:Repositório Institucional da UFOPinstname:Universidade Federal de Ouro Preto (UFOP)instacron:UFOPLICENSElicense.txtlicense.txttext/plain; charset=utf-81748http://www.repositorio.ufop.br/bitstream/123456789/4349/2/license.txt8a4605be74aa9ea9d79846c1fba20a33MD52ORIGINALARTIGO_AnalysisInfluenceGully.pdfARTIGO_AnalysisInfluenceGully.pdfapplication/pdf401714http://www.repositorio.ufop.br/bitstream/123456789/4349/1/ARTIGO_AnalysisInfluenceGully.pdfabaa6cce63da1f1158e3e5a6cddc9d88MD51123456789/43492019-06-12 11:32:41.055oai:localhost:123456789/4349Repositório InstitucionalPUBhttp://www.repositorio.ufop.br/oai/requestrepositorio@ufop.edu.bropendoar:32332019-06-12T15:32:41Repositório Institucional da UFOP - Universidade Federal de Ouro Preto (UFOP)false |
dc.title.pt_BR.fl_str_mv |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. |
title |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. |
spellingShingle |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. Costa, Fernanda Martineli Gully Catchment streams Baseflow Flow pattern |
title_short |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. |
title_full |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. |
title_fullStr |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. |
title_full_unstemmed |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. |
title_sort |
Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. |
author |
Costa, Fernanda Martineli |
author_facet |
Costa, Fernanda Martineli Bacellar, Luis de Almeida Prado |
author_role |
author |
author2 |
Bacellar, Luis de Almeida Prado |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Costa, Fernanda Martineli Bacellar, Luis de Almeida Prado |
dc.subject.por.fl_str_mv |
Gully Catchment streams Baseflow Flow pattern |
topic |
Gully Catchment streams Baseflow Flow pattern |
description |
The baseflow of tributaries to the Velhas River in the northwest region of Ouro Preto County (São Francisco Basin, Brazil) has been declining in the last years, without a simultaneous decrease in the water input. This can only be attributed to badly planned human activities, which result in soil crusting or compaction, erosion, among other types of impact, such as groundwater overexploitation and wetland drainage. Almost all of the study area has been eroded by hundreds of large-size gullies. In order to analyze the influence of erosion in the hydrological behavior of small streams, two similar and contiguous catchments were selected. The only remarkable difference between them is a gully that occupies circa 42% of one of the catchments (“eroded catchment”). Rainfall, flow rates and chemical data were obtained throughout a hydrological year and the results showed that the eroded catchment presented smaller baseflow rates and bigger but short-lived stormflows. This contrasting flow regime is attributed to the gully, which is causing the partial withdraw of the regolith and the exposure of weathered rock. As the regolith has smaller hydraulic conductivities and higher storage coefficients, the exposure of weathered rock on the gully floor explains the odd flow behavior of the eroded catchment. Other studies in the same region confirm the impact caused by the gullies. Thus, the superposition of many gullies can cause decrease of the baseflow and increase of the stormflow. As gullies are very common erosion features in Brazil, they should be much more studied in order to better understand this and other similar types of environmental impact. |
publishDate |
2007 |
dc.date.issued.fl_str_mv |
2007 |
dc.date.accessioned.fl_str_mv |
2015-01-22T15:11:48Z |
dc.date.available.fl_str_mv |
2015-01-22T15:11:48Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/article |
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article |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
COSTA, F. M.; BACELLAR, L. de A. P. Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. CATENA, v. artcle, p. 230-238, 2007. Disponível em: <http://www.sciencedirect.com/science/article/pii/S034181620600124X>. Acesso em: 30 set. 2014. |
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http://www.repositorio.ufop.br/handle/123456789/4349 |
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0341-8162 |
dc.identifier.doi.none.fl_str_mv |
https://doi.org/10.1016/j.catena.2006.05.007 |
identifier_str_mv |
COSTA, F. M.; BACELLAR, L. de A. P. Analysis of the influence of gully erosion in the flow pattern of catchment streams, Southeastern Brazil. CATENA, v. artcle, p. 230-238, 2007. Disponível em: <http://www.sciencedirect.com/science/article/pii/S034181620600124X>. Acesso em: 30 set. 2014. 0341-8162 |
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http://www.repositorio.ufop.br/handle/123456789/4349 https://doi.org/10.1016/j.catena.2006.05.007 |
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