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Previous issue date: 2005-07-01 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The goal of this work comprises the detailed mapping of the coastal zone of the south coast of the State of Rio Grande do Norte. The emphasis of the study is the units of beachrocks and the features of the physical environment associated. The mapping of the beachrocks and of the adjacent coastal features is justified, among other aspects, by the fact that the beachrocks constitute an important protection agent against the sea erosion. By one side, they dissipate the energy of the sea waves and make possible the imprisonment of sediments in the foreshore. The beachrocks in the studied area are constituted of discontinuous strips, parallel to the coast line presenting emerged in some places, even in the highest tides, entirely submerged or partially buried by coastal sediments. These sandstones compose the landscape of big part of the coast and they are responsible for the partial dissipation of the energy of the waves on the studied coast. The methodology used in this work consisted of different techniques were used, as the use of aerial pictures of small format (FAPEFs), acquisition of data of system of global positioning (GPS) and later elaboration of thematic maps and of digital models of soil (MDTs). The results obtained in the mapping of the use and occupation of the soil, demonstrate the existence of strong human pressure in the coastal area (built lots and no built), occupying about 54,74% of built areas. This problem has been taking to degradation risks due to the inconsequent expansion of divisions into lots and tourist enterprises. The MDT came as an excellent resource, as visual as functional, being possible to visualize several angles and to act in three dimensions the relief of the area in study, as well as to identify the present features in the coastal area. By the importance of the bodies of beachrocks as a protection agent against the coastal erosion, faces were delimited in the sandstones based in geometric criteria, classifying them in, central face, outside face, inside face, break and undermiming. These last two associates to the erosion and washout in the base of these bodies. Field data indicate clearly that the most important process in the fracturing of the bodies is associated with mechanisms related to the gravity, being the joints formed by processes of gravitational sliding. Finally, the mapping of the coastal zone starting from aerial pictures of small format it made possible the identification of the elements that compose the beach strip, for accomplishing with larger detailed level and by presenting a better monitoring of the dynamics of the coastal zone / O enfoque deste trabalho ? o mapeamento detalhado da zona costeira do litoral sul do Estado do Rio Grande do Norte, com ?nfase nos corpos de arenitos de praia e nas fei??es do meio f?sico a eles associadas. O mapeamento dos arenitos de praia e das fei??es litor?neas adjacentes justifica-se, dentre outros aspectos, pelo fato de que os arenitos de praia constituem um importante agente de prote??o contra a eros?o marinha. Eles dissipam a energia das ondas e possibilitam o aprisionamento de sedimentos no estir?ncio. Na ?rea estudada, constituem-se de faixas descont?nuas, paralelas ? linha de costa, apresentando-se emersos em alguns locais, mesmo durante as mar?s mais altas, quando ficam totalmente submersos ou parcialmente soterrados por sedimentos litor?neos. Esses arenitos comp?em a paisagem de boa parte do litoral estudado e s?o respons?veis pela dissipa??o parcial da energia das ondas sobre a costa. A metodologia utilizada no presente trabalho constou de diferentes t?cnicas, como o uso de fotografias a?reas de pequeno formato (FAPEFs), aquisi??o de dados de sistema de posicionamento global (GPS) e, posteriormente, elabora??o de mapas tem?ticos e de modelos digitais de terreno (MDTs). Os resultados obtidos no mapeamento de uso e ocupa??o do solo, demonstram a exist?ncia de forte press?o humana na zona costeira (lotes edificados e n?o edificados), abrangendo cerca de 54,74% de ?reas ocupadas. Essa press?o tem levado a riscos de degrada??o devido ? expans?o inconseq?ente de loteamentos e empreendimentos tur?sticos. O MDT apresentou-se como um excelente recurso, tanto visual como funcional, sendo poss?vel visualizar v?rios ?ngulos e representar em tr?s dimens?es o relevo da ?rea em estudo, bem como identificar as fei??es presentes na zona costeira. Dada a import?ncia dos corpos de arenito de praia como um agente de prote??o contra a eros?o costeira, foram delimitadas faces nos arenitos com base em crit?rios geom?tricos, classificando-os em, face central, face externa, face interna, quebras ou barretas e incis?es basais (undermiming). Estes dois ?ltimos est?o associados ? eros?o e solapamento na base destes corpos. Dados de campo indicam claramente que o processo mais importante no fraturamento dos corpos est? associado a mecanismos relacionados ? gravidade, sendo as juntas formadas por processos de deslizamento gravitacional. Finalmente, o mapeamento da zona costeira a partir de fotografias a?reas de pequeno formato permitiu a identifica??o dos elementos que comp?em a faixa de praia, por realizar com maior n?vel de detalhamento e por apresentar um melhor monitoramento da din?mica da zona costeira
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/18792 |
| Date | 01 July 2005 |
| Creators | Ferreira J?nior, Antonio Vicente |
| Contributors | CPF:12714585434, http://lattes.cnpq.br/5120081491389865, Meireles, Ant?nio Jeovah de Andrade, CPF:31666230359, http://lattes.cnpq.br/2431893947841863, Bezerra, Francisco Hilario Rego, Amaral, Ricardo Farias do |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Geodin?mica e Geof?sica, UFRN, BR, Geodin?mica; Geof?sica |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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