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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The remote sensing and GIS applied analysis evolution space time of Icapui municipality coastline, Cearà - Brazil / Sensoriamento remoto e SIG aplicados à anÃlise da evoluÃÃo espaÃotemporal da linha de costa do municÃpio de IcapuÃ, Cearà - Brasil

Wallason Farias de Souza 06 April 2016 (has links)
CoordenaÃÃo de AperfeÃoamento de Pessoal de NÃvel Superior / The coastline is a dynamic environment and its constant morphodynamic adjustments resulting from natural and human processes. The municipality of Icapuà is situated at the eastern end of the state of Cearà - Brazil, has approximately 45 km of coastline and is one of the most complex environmental systems of CearÃ, with varying morphologies of Quaternary origin, which are preserved stretches and impacts of human actions. The main objective of this research is to analyze the evolution timeline (1987-2014) of the coastline of IcapuÃ, analyzing in an integrated manner the local coastal dynamics. The research was conducted in five main stages: bibliographic and cartographic survey, field work, preparation and database analysis in GIS, the diagnosis of evolution with the development of cartographic products and projection scenarios. The coastal plain was compartmentalized into three sectors studies (west, central and east) and used four mathematical and statistical procedures extension "Digital Shoreline Analysis System 4.3" (DSAS) for ArcGIS 10.1, which allowed to compare the shorelines multitemporal extracted from remote sensors products through a base line and transects spaced 500 m apart. It was possible to estimate in meters, considering the clip timeline, the maximum variation (NSM), the absolute variation (SCE), the mean annual change (EPR) and annual linear regression trend (LRR). Assigns to the coastline five classes according to the processes identified in the sections, as follows: progradation continuous, mo*derate progradation and / or semi-relative stability, moderate erosion and / or semi-continuous and continuous erosion. It was evident that the most relevant progradational and erosive processes are present in the western sectors, subsectors erosion Retiro Grande, Redonda and Peroba with trends of -0.5 to -4 m / year, and central sectors with significant decreases in Barreiras da Sereia subsectors and Barrinha, that a decline of up to 115 meters in 27 years and trends between -1.2 and -4.5 m / year, with varying social and environmental impacts, while the eastern sector showed relative stability. From this, it was possible to discuss containment strategies erosion, project possible evolutionary scenarios and suggest directions for planning and management of the coastal zone of the municipality. / A linha de costa à um ambiente dinÃmico e os seus constantes ajustes morfodinÃmicos resultam de processos naturais e humanos. O MunicÃpio de Icapuà està localizado no extremo leste do Estado do Cearà - Brasil, possui aproximadamente 45 km de linha de costa e representa um dos mais complexos sistemas ambientais do litoral cearense, com variadas morfologias de origem QuaternÃria, trechos relativamente conservados e impactos decorrentes das aÃÃes humanas. O objetivo principal desta pesquisa à analisar a evoluÃÃo espaÃotemporal (1987-2014) da linha de costa de IcapuÃ, considerando de forma integrada a dinÃmica costeira local. A pesquisa foi realizada em cinco etapas principais: o levantamento bibliogrÃfico e cartogrÃfico, os trabalhos de campo, a elaboraÃÃo e anÃlise de banco de dados em SIG, o diagnÃstico da evoluÃÃo com a elaboraÃÃo de produtos cartogrÃficos e a projeÃÃo de cenÃrios. Segmentou-se a planÃcie litorÃnea em trÃs setores de estudos (oeste, central e leste) e foram aplicados quatro procedimentos matemÃticos e estatÃsticos da extensÃo Digital Shoreline Analysis System 4.3 (DSAS) para o ArcGIS 10.1, que permitiram comparar as linhas de costa multitemporais extraÃdas de produtos sensores remotos por meio de uma linha de base e transectos espaÃados em 500 metros entre si. Possibilitou-se estimar em metros, considerando o recorte espaÃotemporal, a variaÃÃo mÃxima (NSM), a variaÃÃo absoluta (SCE), a mÃdia de variaÃÃo anual (EPR) e a tendÃncia anual de regressÃo linear (LRR). AtribuÃram-se à linha de costa cinco classes conforme os processos identificados nos trechos, sendo eles: progradaÃÃo contÃnua, progradaÃÃo moderada e/ou semicontÃnua, relativa estabilidade, erosÃo moderada e/ou semicontÃnua e erosÃo contÃnua. Evidenciou-se que os processos progradacionais e erosivos mais relevantes se encontram nos setores oeste, com erosÃo nos subsetores Retiro Grande, Redonda e Peroba, com tendÃncias de -0,5 a -4 m/ano, e central com recuos significativos nos subsetores Barreiras da Sereia e Barrinha, essa com recuo de atà 115 metros em 27 anos e tendÃncias entre -1,2 e -4,5 m/ano, desencadeando variados impactos socioambientais, enquanto o setor leste denotou relativa estabilidade. Com suporte nisso, foi possÃvel discutir as estratÃgias de contenÃÃo da erosÃo, projetar possÃveis cenÃrios evolutivos e sugerir direcionamentos para o planejamento e a gestÃo da zona costeira do municÃpio.

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