Variação da Linha de Costa na Região da Ilha dos Guarás – PA Através de Análise de Série Temporal de Imagens de Satélites (Coastline Changes Using Sattelite Images time series in Guarás Island Region – Pará State, Brazil)
DOI:
https://doi.org/10.26848/rbgf.v4i5.232745Keywords:
Linha de costa, detecção de mudanças, sensoriamento remoto, dinâmica costeira, modelagemAbstract
Este trabalho apresenta uma analise da variação da linha de costa na região da Ilha dos Guarás, Município de Mariteua-PA ao longo das ultimas 3 décadas. Foi analisada uma seqüência de imagens de satélite de alta resolução da área e estabelecido um projeto em Sistema de Informações geográficas (SIG) visando a identificação e caracterização da linha de costa e estabelecendo padrões de mudanças. Os caso estudado mostrou que ferramentas geoespaciais como o “digital shoreline analyst” (DAS) podem ferramentas ser de grande importância na manipulação, análise e modelagem de dados costeiros, principalmente aplicados a estudos de conservação e monitoramento. A Ilha dos Guarás, em especial, apresentou um comportamento bastante peculiar com uma tendência de acreção nas porções laterais (Leste e Oeste) em oposição a uma tendência menos clara de erosão na porção central. Tais processos parecem ter sido mais determinantes na conformação da estrutura costeira da Ilha até o inicio da década de 2000 quando se tornou consideravelmente menos intenso.
Palavras Chave: Linha de costa, sensoriamento remoto, dinâmica costeira, modelagem
Coastline Changes Using Sattelite Images time series in Guarás Island Region – Pará State, Brazil
ABSTRACT
This work analyzes the coastline changes in the Ilha dos Guarás, Para State, Brazil. A sequence high resolution satellite images from 1985 to 2011 of the areas were analyzed in order to develop a systematic Geographic Information Systems (GIS) approach for the identification and characterization of the shoreline characteristics and how they change over the time. The main goal of our work is the proposal of a unified database to incorporate both spectral and spatial data in a temporal GIS framework. The examples analyzed showed that geospatial tools such as the Digital Shoreline Analyst (DSA) used could became a powerful tool for handling and analyzed data focused on the environmental monitoring and the coastal protection and conservation. The Guarás Island showed a peculiar dynamic with two areas of intense accretion in the flanks of the island in opposition of the central portion of the island submitted to a unstable erosional process. These processes were more severe until the beginning of the 21th century when it became considerable less intense.
Keywords: Coastline, Remote Sensing, Coastal dynamics, shoreline modelling
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