Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2015-11-12T14:50:39Z No. of bitstreams: 1 CarlosDeSouzaJunior_DISSERT.pdf: 9843701 bytes, checksum: 8e563077102155eb9d912b0e87894399 (MD5) / Approved for entry into archive by Elisangela Moura (lilaalves@gmail.com) on 2015-11-16T13:32:44Z (GMT) No. of bitstreams: 1 CarlosDeSouzaJunior_DISSERT.pdf: 9843701 bytes, checksum: 8e563077102155eb9d912b0e87894399 (MD5) / Made available in DSpace on 2015-11-16T13:32:44Z (GMT). No. of bitstreams: 1 CarlosDeSouzaJunior_DISSERT.pdf: 9843701 bytes, checksum: 8e563077102155eb9d912b0e87894399 (MD5) Previous issue date: 2013-12-20 / As mudan?as naturais e antr?picas que v?m ocorrendo na zona costeira em todo o mundo representam um dos maiores problemas para a sociedade neste s?culo. Essa import?ncia se torna mais evidente devido ? elevada densidade das cidades litor?neas, ? crescente especula??o tur?stico-imobili?ria dessas ?reas e ?s altera??es clim?ticas que tendem a desencadear e acelerar esses processos. Nesse contexto, percebe-se cada vez mais um aumento significativo dos problemas relacionados ? eros?o costeira e recuo de fal?sias no estado do Rio Grande do Norte. A ?rea de estudo desta pesquisa localiza-se na zona costeira do munic?pio de Ba?a Formosa/RN, no litoral oriental-sul do Rio Grande do Norte, e possui uma extens?o de cerca de 1200 m ao longo da praia do Porto. O objetivo principal deste trabalho ? analisar a estabilidade dessas fal?sias, atrav?s de investiga??es de campo, ensaios e an?lises computacionais utilizando o M?todo dos Elementos Finitos e o M?todo de Bishop. Para atender aos objetivos deste trabalho, a ?rea foi subdividida em quatro trechos, e foram aplicados checklists e tamb?m realizados ensaios de caracteriza??o e de cisalhamento direto com materiais obtidos ao longo desses trechos. Os segmentos de fal?sia nessa zona costeira possuem alturas variando em torno de 4 m e 14 m e inclina??es de aproximadamente 40? a 90?. Os solos constituintes das fal?sias foram classificados, em termos gerais, como areias argilosas ou siltosas e argilas arenosas, sendo os solos mais argilosos e variegados pertencentes ? base da fal?sia. As an?lises de estabilidade mostraram que os fatores de seguran?a variaram, no trecho 01, de 2,38 a 6,06, no trecho 02, de 1,01 a 1,62, no trecho 03, de 1,29 a 1,78, e no trecho 04, de 0,83 a 2,48. Assim, os trechos 02 e 03, foram considerados como mais inst?veis. Entretanto, pode-se considerar o trecho 03 como o mais cr?tico devido ? aus?ncia de estruturas de prote??o costeira e ? estreita faixa de praia. Fato que n?o ocorre no trecho 02, o qual possui uma extensa faixa de praia e ? protegido por um muro de arrimo que restringe o acesso dos banhistas ?s ?reas adjacentes do p? da fal?sia. / The natural and anthropogenic changes that are occurring at the coastal zone around the world represent the greatest problem to society in this century. This problem becomes more evident due to high density of coastal cities, to growing tourist-estate speculation of those areas and to climate change that tend to trigger and accelerate the erosive processes that operating in the littoral. In this context, it?s possible perceive ever more a significant increase of problems associated to the coastal erosion and retreat of cliffs in the state of Rio Grande do Norte, where this study area of this search is located. The area is located in the coastal zone of the city of Ba?a Formosa/RN, in south-eastern coast of Rio Grande do Norte, and has a extension of about 1200 meters along the Porto beach. The main objective of this study is to analyze the stability of these cliffs in this region. Through field investigations, testings and computational analysis using the Finite Element Method and Equilibrium Limit Methods. The area was divided into four sections, and were applied checklists, and also realized characterization tests and direct shear tests with materials obtained along these sections. In this manner, it was found that the segments of cliff in this coastal zone have heights around 4 meters to 14 meters and inclinations of approximately 40? to 90?.However the constituents soils of the cliffs were classified, in general terms in accordance to Unified Soil Classification System (USCS), as clayey sands or silty sands, clays of low plasticity, clayey gravels and poorly graduaded sands. The most variegated and clayey soils belong to base of the cliff. The stability analysis showed that the safety factors ranged in section 01, from 1.92 to 4.93, in the section 02, from 1.00 to 1.43, in the section 03, from 1.36 to 1.75 , and section 04, from 1.00 to 3.64. Thus, the sections 02 and 03 were considered more unstable. However, the section 03 can be considered as the most critical section due to the absence of coastal protection structures and the narrow strip of beach.

Made available in DSpace on 2014-12-17T15:03:23Z (GMT). No. of bitstreams: 1 KleitonCN_DISSERT.pdf: 3918645 bytes, checksum: fd0ad2d9340e0d6860f2ffe24703f4ce (MD5) Previous issue date: 2009-12-22 / Through out the course of a steady increase in search and recovery of space in the coastal zone, there is also an expanding concern about the erosion processes of this area. The main problem in coastal areas is that urbanization occurs in a disorderly fashion and unsustainable, further aggravating the problems of coastal dynamics. The study area of this work is located on the southern coast of Pirangi do Norte beach to about 20km south of Natal, capital of Rio Grande do Norte in the Parnamirim City. This area has the length of approximately 1km, divided into three sections (Western, Central and Eastern) with a morphology consisting of a tableland at the top, sea cliffs in the West and Central parts and sand dunes in the Eastern section, both vegetated, and a coastal plain on the inferior part associated with the presence of beach rocks. This study aimed to analyze the erosion processes operating in the excerpt of Pirangi do Norte beach and assess the feasibility of their monitoring making use of DGPS (Global Positioning System Differential mode). During the work it was carried out a physical description of the area through photo-interpretation and site survey after measurement of the shoreline in the period between November 2004 and November 2009 and beach profiles between August 2005 and July 2006. The analysis of the results of the annual surveys showed the occurrence of variations of the shoreline along the stretch traveled. Sites are identified in advancement coast from the sea and it was verified in loco the presence of erosion with deposition of materials on the lower part of the coastal bluff, the former position of the shoreline, showing a false notion of advancing it. This leads to the conclusion that the data collected in a survey of the shoreline should always be accompanied by photographic records of the local area and with the highest rate of erosion, thus avoiding the mistake of treating the deposit materials as evidence of progress coast. At the end of the study, after a review of various works to mitigate the erosion in the coastal zone, it is recommended to the area of study the adoption of an artificial feeding of the beach, aiming the minimization of the erosive effects of the tides. Moreover, it is suggested that even the continuity of monitoring, maintenance of existing vegetation and control of the occupation on the edge of sea cliffs / Em meio a um cont?nuo aumento da busca e valoriza??o do espa?o na zona costeira, cresce tamb?m a preocupa??o sobre os processos erosivos caracter?sticos desta ?rea. O maior problema nas zonas litor?neas ? que a urbaniza??o ocorre de forma desordenada e insustent?vel, agravando ainda mais os problemas decorrentes da din?mica costeira. A ?rea de estudo deste trabalho est? localizada no litoral Sul do Estado na praia de Pirangi do Norte, ? aproximadamente 20km ao Sul de Natal, capital do Rio Grande do Norte, no munic?pio de Parnamirim. Essa ?rea possui uma extens?o aproximada de 1km dividida em tr?s trechos (Oeste, Central e Leste) com morfologia formada por tabuleiro costeiro na parte superior, fal?sias nos trechos Oeste e Central e dunas no trecho Leste, ambas vegetadas, e uma plan?cie costeira na parte inferior associada ? presen?a de recifes de arenito. Este trabalho teve o objetivo de analisar os processos erosivos atuantes no trecho da praia de Pirangi do Norte e avaliar a viabilidade do seu monitoramento fazendo uso do DGPS (Sistema de Posicionamento Global em modo Diferencial). Foi realizada durante o trabalho uma caracteriza??o f?sica da ?rea por meio de fotointerpreta??o e vistoria local seguida de levantamentos da linha de costa no per?odo entre novembro de 2004 e novembro de 2009 e perfis de praia entre agosto de 2005 e julho de 2006. A an?lise sobre os resultados dos levantamentos anuais mostrou a ocorr?ncia de varia??es da linha de costa ao longo do trecho percorrido. Em locais identificados em planta como avan?o da costa em rela??o ao mar foi verificado in loco a presen?a de eros?o com dep?sito de materiais sobre o p? da fal?sia, antiga posi??o da linha de costa, dando a no??o de falso avan?o da mesma. Esse fato leva a conclus?o de que os dados coletados em um levantamento da linha de costa devem ser sempre acompanhados por registros fotogr?ficos da ?rea e locais com maior ?ndice de eros?o, evitando, assim, o equ?voco de tratar materiais de dep?sito como indicio de avan?o de costa. Ao final do trabalho, ap?s uma an?lise das diversas obras de mitiga??o dos processos erosivos na zona costeira, recomenda-se para o local de estudo a ado??o da alimenta??o artificial da praia, visando minimizar os efeitos erosivos das mar?s. Al?m disso, sugere-se ainda a continuidade do monitoramento, manuten??o da vegeta??o existente e controle da ocupa??o na borda dos trechos com fal?sias

Made available in DSpace on 2015-03-13T17:10:44Z (GMT). No. of bitstreams: 1 LidianeSN_DISSERT.pdf: 4629879 bytes, checksum: d28e312771a5a0b81c006b055f5b7eb1 (MD5) Previous issue date: 2011-02-24 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The coastal zone has been studied worldwide with a focus on the coastal erosion. In the present days, much of the world's coastlines are being affected by erosion, which causes great damage to the economy. This work had as study case the beaches of Areia Preta, Artistas, Meio and Forte located in Natal in Rio Grande do Norte. It shows as result the monitoring of the beach strip that makes possible to obtain quantitative and qualitative data, allows the study of the coastal dynamics of the beaches and the Recovery Project of the Areia Preta beach interference on adjacent beaches. This research was guided by the integrated analysis method on the systemic perspective. The pratical procedures adopted were: bibliographic research; fieldwork during eleven months (environmental characterization, collection of hydrodynamic data, topographic leveling, collection of sediments) and; sedimentological analysis of samples collected. By monitoring of the points A, B, C, D and E we were able to find the occurrence of the coastal erosion on their biggest part except by the C and D profiles. It was noted the need for the government to complete the hydraulic fill, as it made only 60% of the landfill planed. It was found that the spikes built on the beach of Areia Preta are preventing the natural transport of sediments that the longshore performs towards South-North. This interference is causing the lack of sediment on the beaches of Forte and Meio and their coastal erosion in consequence / A zona costeira tem sido estudada em escala mundial com o enfoque na eros?o costeira. Atualmente, grande parte das linhas de costa mundial est? sendo afetada pela eros?o, o que gera grande preju?zo para a economia. O trabalho teve como ?rea de estudo as praias de Areia Preta, dos Artistas, do Meio e do Forte, localizadas em Natal/RN. Apresenta como resultado o monitoramento da faixa de praia, que possibilita a obten??o de dados quantitativos e qualitativos, permite o estudo da din?mica costeira das praias e da interfer?ncia do projeto de recupera??o da praia de Areia Preta nas praias adjacentes. Esta pesquisa foi norteada pelo m?todo da an?lise integrada, na perspectiva sist?mica. Os procedimentos pr?ticos adotados foram: pesquisa bibliogr?fica; trabalho de campo durante onze meses (caracteriza??o ambiental, coleta de dados hidrodin?micos, nivelamento topogr?fico e coleta de sedimentos) e; an?lise sedimentol?gica das amostras coletadas. Atrav?s do monitoramento dos pontos A, B, C, D e E, foi poss?vel constatar a ocorr?ncia de eros?o costeira em todos os perfis. Notou-se a necessidade do poder p?blico completar o aterro hidr?ulico, j? que este efetuou apenas 60% do aterro previsto. Constatou-se que os espig?es constru?dos na praia de Areia Preta est?o impedindo o transporte natural de sedimentos, que a deriva litor?nea realiza no sentido Sul-Norte. Essa interfer?ncia est? acarretando na falta de sedimentos nas praias do Meio e do Forte e, conseq?entemente, na eros?o costeira das referidas praias