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

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

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dc.contributor.author	Lima, Zuleide Maria Carvalho
dc.contributor.author	Alves, Adriano de lima
dc.contributor.author	Amaro, Venerando Eustáquio
dc.contributor.author	Vital, Helenice
dc.date.accessioned	2021-01-07T18:21:28Z
dc.date.available	2021-01-07T18:21:28Z
dc.date.issued	2001
dc.description.resumo	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	pt_BR
dc.identifier.citation	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	pt_BR
dc.identifier.doi	10.22456/1807-9806.20324
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/31229
dc.language	pt_BR	pt_BR
dc.publisher	Pesquisas em Geociências	pt_BR
dc.subject	Remote sensing	pt_BR
dc.subject	Coastal evolution	pt_BR
dc.subject	Spit	pt_BR
dc.title	Evolução da linha de costa do esporão de Galinhos (NE Brasil) utilizando fotografias aéreas e imagens Landsat TM	pt_BR
dc.type	article	pt_BR