Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10451/28096 |
Resumo: | The role of different factors potentially affecting the size and location of large gully systems is explored in two tributary basins of the Tagus River (S Portugal). The hillslopes of these basins, corresponding to tertiary sedimentary formations, are affected by hundreds of large gully systems, varying in extent from somewhat b200 m2 to N3 ha. A study set of 90 gully systems were vectorized from aerial ortophotos and analysed in relation to a set of potential control variables, obtained by reconstructing the pre-erosion topography. Multiple linear regression and logistic regression were combined in order to investigate controls over the general morphometry of these landforms (area, perimeter and sinuosity) and their location in the respective basins. Results indicate that gully systems initiated as bank gullies in response to an incision by the drainage network in both basins and then evolved as a function of upslope contributing area, developing progressively more sinuous outlines as a result of headcut bifurcation. Pre-erosion topographic formwas shown to have only a marginal effect, with results suggesting gully systems have grown essentially throughmassmovements in headcuts and sidewalls, influenced by subsurface water. |
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Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topographyGully erosionGully complexLogistic regressionMultiple linear regressionThe role of different factors potentially affecting the size and location of large gully systems is explored in two tributary basins of the Tagus River (S Portugal). The hillslopes of these basins, corresponding to tertiary sedimentary formations, are affected by hundreds of large gully systems, varying in extent from somewhat b200 m2 to N3 ha. A study set of 90 gully systems were vectorized from aerial ortophotos and analysed in relation to a set of potential control variables, obtained by reconstructing the pre-erosion topography. Multiple linear regression and logistic regression were combined in order to investigate controls over the general morphometry of these landforms (area, perimeter and sinuosity) and their location in the respective basins. Results indicate that gully systems initiated as bank gullies in response to an incision by the drainage network in both basins and then evolved as a function of upslope contributing area, developing progressively more sinuous outlines as a result of headcut bifurcation. Pre-erosion topographic formwas shown to have only a marginal effect, with results suggesting gully systems have grown essentially throughmassmovements in headcuts and sidewalls, influenced by subsurface water.ElsevierRepositório da Universidade de LisboaBergonse, RafaelloReis, Eusébio2017-06-16T15:48:25Z20162016-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/28096engCatena 147 (2016) 621–6310341-816210.1016/j.catena.2016.08.014metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T16:19:24Zoai:repositorio.ul.pt:10451/28096Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:44:20.815263Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography |
title |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography |
spellingShingle |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography Bergonse, Rafaello Gully erosion Gully complex Logistic regression Multiple linear regression |
title_short |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography |
title_full |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography |
title_fullStr |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography |
title_full_unstemmed |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography |
title_sort |
Controlling factors of the size and location of large gully systems: a regression-based exploration using reconstructed pre-erosion topography |
author |
Bergonse, Rafaello |
author_facet |
Bergonse, Rafaello Reis, Eusébio |
author_role |
author |
author2 |
Reis, Eusébio |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Repositório da Universidade de Lisboa |
dc.contributor.author.fl_str_mv |
Bergonse, Rafaello Reis, Eusébio |
dc.subject.por.fl_str_mv |
Gully erosion Gully complex Logistic regression Multiple linear regression |
topic |
Gully erosion Gully complex Logistic regression Multiple linear regression |
description |
The role of different factors potentially affecting the size and location of large gully systems is explored in two tributary basins of the Tagus River (S Portugal). The hillslopes of these basins, corresponding to tertiary sedimentary formations, are affected by hundreds of large gully systems, varying in extent from somewhat b200 m2 to N3 ha. A study set of 90 gully systems were vectorized from aerial ortophotos and analysed in relation to a set of potential control variables, obtained by reconstructing the pre-erosion topography. Multiple linear regression and logistic regression were combined in order to investigate controls over the general morphometry of these landforms (area, perimeter and sinuosity) and their location in the respective basins. Results indicate that gully systems initiated as bank gullies in response to an incision by the drainage network in both basins and then evolved as a function of upslope contributing area, developing progressively more sinuous outlines as a result of headcut bifurcation. Pre-erosion topographic formwas shown to have only a marginal effect, with results suggesting gully systems have grown essentially throughmassmovements in headcuts and sidewalls, influenced by subsurface water. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016 2016-01-01T00:00:00Z 2017-06-16T15:48:25Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10451/28096 |
url |
http://hdl.handle.net/10451/28096 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Catena 147 (2016) 621–631 0341-8162 10.1016/j.catena.2016.08.014 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799134364819259392 |