Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM

Galinhos is one of many spits along the northern coast of Rio Grande do Norte state. Nowadays it has almost 10 km of extension in the E-W direction and medium width of 550 m. Sandy beaches, reefs, estuary, mangroves, lagoon, and dunes are the characteristic geomorphologic features. The modeling of t...

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Principais autores: Lima, Zuleide Maria Carvalho, Alves, Adriano de lima, Amaro, Venerando Eustáquio, Vital, Helenice
Formato: article
Idioma:pt_BR
Publicado em: Pesquisas em Geociências
Assuntos:
Remote sensing
Coastal evolution
Spit
Endereço do item:https://repositorio.ufrn.br/handle/123456789/31229
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spelling ri-123456789-312292021-01-10T07:54:17Z Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM Lima, Zuleide Maria Carvalho Alves, Adriano de lima Amaro, Venerando Eustáquio Vital, Helenice Remote sensing Coastal evolution Spit Galinhos is one of many spits along the northern coast of Rio Grande do Norte state. Nowadays it has almost 10 km of extension in the E-W direction and medium width of 550 m. Sandy beaches, reefs, estuary, mangroves, lagoon, and dunes are the characteristic geomorphologic features. The modeling of these features is directly correlated with the united performance of waves, coastal current and winds, related with variations of the se level happened in the Quaternary. Aiming to monitoring the evolution of the coastline, it was used aerial photographs from 1954, 1967 and 1988 and satellite images from 1989 and 2000. After georeferred, the images were submitted to several techniques of digital processing, being applied synthesis techniques (dimensionality reduction) and emphasis of the information contained in the same ones, as: RGB colored compositions, index methods (NDWI), analysis for main components (PC’s) and space frequency filtering (directional filters). Each one of the six spectral bands (1-5 and 7) of the Landsat 5-TM and 7-ETM+ were submitted to contrast modifications of the histogram (lineal and no lineal contrast transformations). Among the applied processes, NDWI and the colored composition RGB 432 showed better results to the identification of the interface sea/earth. The application of directional filters allowed to observe submerged features, as sandwaves and photolineaments; the last one also observed in the aerial photographs, with direction NE-SW, which infers the existence of a paleo-channel, cutting the Galinhos spit, suggesting ancient system of island barrier developing for the current spit. The results show a ciclicity of erosional and accretionary processes, as well as the progress of the field of coastal dunes, located in the end East, burying the mangrove vegetation and silting up the tidal channel 2021-01-07T18:21:28Z 2021-01-07T18:21:28Z 2001 article LIMA, Z. M. C. ; ALVES, A. L. ; AMARO, V. E. ; VITAL, Helenice . Evolução da linha de costa do esporão de Galinhos-RN usando fotografias aéreas e imagem Landsat. Pesquisas em Geociências, v. 28, n.2, p. 25-33, 2002. Disponível em: https://seer.ufrgs.br/PesquisasemGeociencias/article/view/20324. Acesso em: 29 dez. 2020. https://doi.org/10.22456/1807-9806.20324 https://repositorio.ufrn.br/handle/123456789/31229 10.22456/1807-9806.20324 pt_BR application/pdf Pesquisas em Geociências
institution Repositório Institucional
collection RI - UFRN
language pt_BR
topic Remote sensing
Coastal evolution
Spit
spellingShingle Remote sensing
Coastal evolution
Spit
Lima, Zuleide Maria Carvalho
Alves, Adriano de lima
Amaro, Venerando Eustáquio
Vital, Helenice
Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM
description Galinhos is one of many spits along the northern coast of Rio Grande do Norte state. Nowadays it has almost 10 km of extension in the E-W direction and medium width of 550 m. Sandy beaches, reefs, estuary, mangroves, lagoon, and dunes are the characteristic geomorphologic features. The modeling of these features is directly correlated with the united performance of waves, coastal current and winds, related with variations of the se level happened in the Quaternary. Aiming to monitoring the evolution of the coastline, it was used aerial photographs from 1954, 1967 and 1988 and satellite images from 1989 and 2000. After georeferred, the images were submitted to several techniques of digital processing, being applied synthesis techniques (dimensionality reduction) and emphasis of the information contained in the same ones, as: RGB colored compositions, index methods (NDWI), analysis for main components (PC’s) and space frequency filtering (directional filters). Each one of the six spectral bands (1-5 and 7) of the Landsat 5-TM and 7-ETM+ were submitted to contrast modifications of the histogram (lineal and no lineal contrast transformations). Among the applied processes, NDWI and the colored composition RGB 432 showed better results to the identification of the interface sea/earth. The application of directional filters allowed to observe submerged features, as sandwaves and photolineaments; the last one also observed in the aerial photographs, with direction NE-SW, which infers the existence of a paleo-channel, cutting the Galinhos spit, suggesting ancient system of island barrier developing for the current spit. The results show a ciclicity of erosional and accretionary processes, as well as the progress of the field of coastal dunes, located in the end East, burying the mangrove vegetation and silting up the tidal channel
format article
author Lima, Zuleide Maria Carvalho
Alves, Adriano de lima
Amaro, Venerando Eustáquio
Vital, Helenice
author_facet Lima, Zuleide Maria Carvalho
Alves, Adriano de lima
Amaro, Venerando Eustáquio
Vital, Helenice
author_sort Lima, Zuleide Maria Carvalho
title Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM
title_short Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM
title_full Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM
title_fullStr Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM
title_full_unstemmed Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM
title_sort evolução da linha de costa do esporão de galinhos (ne brasil) utilizando fotografias aéreas e imagens landsat tm
publisher Pesquisas em Geociências
publishDate 2021
url https://repositorio.ufrn.br/handle/123456789/31229
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AT amarovenerandoeustaquio evolucaodalinhadecostadoesporaodegalinhosnebrasilutilizandofotografiasaereaseimagenslandsattm
AT vitalhelenice evolucaodalinhadecostadoesporaodegalinhosnebrasilutilizandofotografiasaereaseimagenslandsattm
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