Geotecnologias aplicadas ao monitoramento da linha de costa e cobertura sedimentar do Litoral de Icapuí (Ceará) entre 1985 e 2018

• Autor(a) principal: Costa, Lucyanno dos Reis Fernandes Gomes da
• Data de Publicação: 2019
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/50433
• topic: Sensoriamento remoto; Processamento de imagem; Paisagem costeira

Coastal areas can be considered as geological and environmental indicators because they represent regions of high sensitivity to changes in short time and fine scale. To monitor these changes, geotechnology has products, tools and techniques that can calculate deposition and erosion rates, quantifying areas and volumes. The study area is located on the eastern coast of Ceará, located on the beach of Ponta Grossa, in the municipality of Icapuí / CE, where coastal processes are involved in the construction and deconstruction of sedimentary features that modify the geometry of the coast in long intervals of time, medium and short. In addition, the beach of Ponta Grossa has been increasingly occupied in its coastal strip by the local population, with some popular constructions of medium and small size. The general objective of the academic thesis is to analyze the sedimentary cover in Icapuí-Ceará, with the use of precision geodesy and remote sensing products in long, medium and short time; and small, intermediate and fine scale. The methodology applied in this work was divided into: a) coastal analysis between 1985 and 2015; b) mapping the sedimentary cover between 2012 and 2015, c) edition of the Land Elevation Models (MDE) to quantify the sedimentary coverage in volume between 2013 and 2018. The High Precision Geodetic GPS was used to perform the topographic surveys on the beach and the procedures applied for the highlighting and mapping of the sedimentary cover were; Fusion of images; Contrast Enhancement, Filter Application, Principal Component Analysis (PCAs), Composite Color Test (RGB and HSI); multi-sensor integration and 3D modeling. The results obtained were: between 1985 and 2015 - Positive sediment balance for the total and sectoral coastline variation; between 2015 and 2018 with a final positive balance, with gain in the area of 171053 m²; between 2013 and 2018, a positive global sediment balance, with volumetric gains greater than erosion losses. Finally, according to the results obtained, corroborating with the hypotheses tested, it is concluded that, in the region studied, deposition processes predominated to the detriment of erosion, especially in the east sector of Icapuí, specifically in Ponta Grossa beach.