Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil
Autor(a) principal: | |
---|---|
Data de Publicação: | 2020 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por eng |
Título da fonte: | Sociedade & natureza (Online) |
Texto Completo: | https://seer.ufu.br/index.php/sociedadenatureza/article/view/49647 |
Resumo: | Although being well established in continental watersheds, morphometric analysis is still incipient in oceanic islands. This paper aims to analyze the morphometry and morphologically classify the Trindade Isle, in South Atlantic. The parameters used were altitude, slope gradient, LS factor, Topographic Wetness Index (WTI) and Geomorphons classification. Trindade isle has an altimetric amplitude of 600m, with 34% of its area between 0-100m and 21.2% in the 100-200m class. The isle’s lower parts are gravel and sand beaches and alluvial fans. Ridgelines such as the Desejado and Verde peaks represent heights above 500m and occupy 2% of the isle’s area. Slope gradients vary from strongly undulated (20-45%) to hilly (45-75%), with both classes occupying half the isle’s area. Flatter areas (with slope gradients between 0-3% and 3-8%) occupy less than 4% of the isle. The slope faces more exposed to weather conditions (rainfall and winds) are the oriented to east and southeast, therefore being the most prone to modelling relief processes. The western and northwestern faces are steeper and more sheltered. The Geomorphons classification has shown that 57% of the isle is composed by straight slopes, 19% are spurs (slightly convex slopes in plan and profile), and 18.6% are hollows. The WTI shows that the areas prone to saturation are relief concavities and in the medium to lower thirds of the slopes. |
id |
UFU-6_16573c0ce2d742718c8283b09aec776a |
---|---|
oai_identifier_str |
oai:ojs.www.seer.ufu.br:article/49647 |
network_acronym_str |
UFU-6 |
network_name_str |
Sociedade & natureza (Online) |
repository_id_str |
|
spelling |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, BrazilAnálise morfométrica e morfológica da Ilha da Trindade, Atlântico Sul, BrasilIlhas OceânicasHidrologiaÍndice Topográfico de UmidadeGeomorphonsOceanic IslandsHydrologyWetness Topographic IndexGeomorphonsAlthough being well established in continental watersheds, morphometric analysis is still incipient in oceanic islands. This paper aims to analyze the morphometry and morphologically classify the Trindade Isle, in South Atlantic. The parameters used were altitude, slope gradient, LS factor, Topographic Wetness Index (WTI) and Geomorphons classification. Trindade isle has an altimetric amplitude of 600m, with 34% of its area between 0-100m and 21.2% in the 100-200m class. The isle’s lower parts are gravel and sand beaches and alluvial fans. Ridgelines such as the Desejado and Verde peaks represent heights above 500m and occupy 2% of the isle’s area. Slope gradients vary from strongly undulated (20-45%) to hilly (45-75%), with both classes occupying half the isle’s area. Flatter areas (with slope gradients between 0-3% and 3-8%) occupy less than 4% of the isle. The slope faces more exposed to weather conditions (rainfall and winds) are the oriented to east and southeast, therefore being the most prone to modelling relief processes. The western and northwestern faces are steeper and more sheltered. The Geomorphons classification has shown that 57% of the isle is composed by straight slopes, 19% are spurs (slightly convex slopes in plan and profile), and 18.6% are hollows. The WTI shows that the areas prone to saturation are relief concavities and in the medium to lower thirds of the slopes.Apesar de bem estabelecida em bacias hidrográficas continentais, a análise morfométrica ainda é pouco desenvolvida em ilhas oceânicas. Este trabalho tem como objetivo analisar a morfometria e classificar morfologicamente a ilha da Trindade, localizada no Atlântico Sul e, verificar sua relação com o ITU. Foram utilizados os parâmetros de altimetria, declividade, fator LS, Índice Topográfico de Umidade (ITU) e a classificação Geomorphons. A ilha da Trindade tem amplitude altimétrica de 600m, sendo que 34% da área da ilha tem cota entre 0-100m e, 21,2% tem entre 100-200m. As áreas mais baixas da ilha são praias de cascalho, areia e leques aluviais. Divisores de água como os picos do Desejado e Verde correspondem às porções acima de 500m e ocupam cerca de 2% da área da ilha. A declividade varia de fortemente ondulada (20-45%) a montanhosa (45-75%), com ambas as classes ocupando mais de metade da ilha. As porções mais aplainadas (declividade entre 0-3% e 3-8%) ocupam menos de 4% da área. Verifica-se que as faces das vertentes mais expostas da ilha às intempéries climáticas (vento e chuva) são as orientadas a leste e sudeste e, portanto, são as mais trabalhadas por processos escultores do relevo. As faces oeste e noroeste são as mais escarpadas e protegidas das ações de intempéries climáticas. A classificação por Geomorphons mostrou que 57% da área da ilha é composta por encostas retilíneas, 19% são cristas secundárias (encostas levemente convexas em plano e perfil) e 18,6% são concavidades. O ITU aponta para setores com tendência a saturação em concavidades do relevo e terços médios e inferiores das encostas, com predominância na porção leste.Universidade Federal de Uberlândia2020-04-13info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://seer.ufu.br/index.php/sociedadenatureza/article/view/4964710.14393/SN-v32-2020-49647Sociedade & Natureza; Vol. 32 (2020); 236-261Sociedade & Natureza; v. 32 (2020); 236-2611982-45130103-1570reponame:Sociedade & natureza (Online)instname:Universidade Federal de Uberlândia (UFU)instacron:UFUporenghttps://seer.ufu.br/index.php/sociedadenatureza/article/view/49647/28652https://seer.ufu.br/index.php/sociedadenatureza/article/view/49647/28653Copyright (c) 2020 Gabriel Nogueira, Julia Frederica Effgen, Eberval Marchioroinfo:eu-repo/semantics/openAccessNogueira, Gabriel Frederica Effgen, Julia Marchioro, Eberval2021-07-01T16:18:20Zoai:ojs.www.seer.ufu.br:article/49647Revistahttp://www.sociedadenatureza.ig.ufu.br/PUBhttps://seer.ufu.br/index.php/sociedadenatureza/oai||sociedade.natureza.ufu@gmail.com|| lucianamelo@ufu.br1982-45130103-1570opendoar:2021-07-01T16:18:20Sociedade & natureza (Online) - Universidade Federal de Uberlândia (UFU)false |
dc.title.none.fl_str_mv |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil Análise morfométrica e morfológica da Ilha da Trindade, Atlântico Sul, Brasil |
title |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil |
spellingShingle |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil Nogueira, Gabriel Ilhas Oceânicas Hidrologia Índice Topográfico de Umidade Geomorphons Oceanic Islands Hydrology Wetness Topographic Index Geomorphons |
title_short |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil |
title_full |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil |
title_fullStr |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil |
title_full_unstemmed |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil |
title_sort |
Morphometric and Morphological Analysis of Trindade Island, South Atlantic, Brazil |
author |
Nogueira, Gabriel |
author_facet |
Nogueira, Gabriel Frederica Effgen, Julia Marchioro, Eberval |
author_role |
author |
author2 |
Frederica Effgen, Julia Marchioro, Eberval |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Nogueira, Gabriel Frederica Effgen, Julia Marchioro, Eberval |
dc.subject.por.fl_str_mv |
Ilhas Oceânicas Hidrologia Índice Topográfico de Umidade Geomorphons Oceanic Islands Hydrology Wetness Topographic Index Geomorphons |
topic |
Ilhas Oceânicas Hidrologia Índice Topográfico de Umidade Geomorphons Oceanic Islands Hydrology Wetness Topographic Index Geomorphons |
description |
Although being well established in continental watersheds, morphometric analysis is still incipient in oceanic islands. This paper aims to analyze the morphometry and morphologically classify the Trindade Isle, in South Atlantic. The parameters used were altitude, slope gradient, LS factor, Topographic Wetness Index (WTI) and Geomorphons classification. Trindade isle has an altimetric amplitude of 600m, with 34% of its area between 0-100m and 21.2% in the 100-200m class. The isle’s lower parts are gravel and sand beaches and alluvial fans. Ridgelines such as the Desejado and Verde peaks represent heights above 500m and occupy 2% of the isle’s area. Slope gradients vary from strongly undulated (20-45%) to hilly (45-75%), with both classes occupying half the isle’s area. Flatter areas (with slope gradients between 0-3% and 3-8%) occupy less than 4% of the isle. The slope faces more exposed to weather conditions (rainfall and winds) are the oriented to east and southeast, therefore being the most prone to modelling relief processes. The western and northwestern faces are steeper and more sheltered. The Geomorphons classification has shown that 57% of the isle is composed by straight slopes, 19% are spurs (slightly convex slopes in plan and profile), and 18.6% are hollows. The WTI shows that the areas prone to saturation are relief concavities and in the medium to lower thirds of the slopes. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-04-13 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.ufu.br/index.php/sociedadenatureza/article/view/49647 10.14393/SN-v32-2020-49647 |
url |
https://seer.ufu.br/index.php/sociedadenatureza/article/view/49647 |
identifier_str_mv |
10.14393/SN-v32-2020-49647 |
dc.language.iso.fl_str_mv |
por eng |
language |
por eng |
dc.relation.none.fl_str_mv |
https://seer.ufu.br/index.php/sociedadenatureza/article/view/49647/28652 https://seer.ufu.br/index.php/sociedadenatureza/article/view/49647/28653 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2020 Gabriel Nogueira, Julia Frederica Effgen, Eberval Marchioro info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2020 Gabriel Nogueira, Julia Frederica Effgen, Eberval Marchioro |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Uberlândia |
publisher.none.fl_str_mv |
Universidade Federal de Uberlândia |
dc.source.none.fl_str_mv |
Sociedade & Natureza; Vol. 32 (2020); 236-261 Sociedade & Natureza; v. 32 (2020); 236-261 1982-4513 0103-1570 reponame:Sociedade & natureza (Online) instname:Universidade Federal de Uberlândia (UFU) instacron:UFU |
instname_str |
Universidade Federal de Uberlândia (UFU) |
instacron_str |
UFU |
institution |
UFU |
reponame_str |
Sociedade & natureza (Online) |
collection |
Sociedade & natureza (Online) |
repository.name.fl_str_mv |
Sociedade & natureza (Online) - Universidade Federal de Uberlândia (UFU) |
repository.mail.fl_str_mv |
||sociedade.natureza.ufu@gmail.com|| lucianamelo@ufu.br |
_version_ |
1799943981233078272 |