Aplicação de imagens multiespectrais de sentinel-2 na monitorização do jacinto-de-água: estudo de caso no Baixo Mondego (Portugal)
DOI:
https://doi.org/10.14195/1647-7723_31-1_6Palavras-chave:
Recursos hídricos, infestantes aquáticas, deteção remota, satélite, índices de vegetaçãoResumo
As espécies exóticas com grande potencial invasor constituem uma séria ameaça à redução da biodiversidade, resultando em custos ambientais e económicos elevados. No caso de plantas invasoras aquáticas, a extensão desta problemática a massas de água superficiais vulneráveis apresenta-se como especialmente gravosa. Dificuldades inerentes à monitorização dessas plantas com métodos convencionais têm levado à utilização de ferramentas de deteção remota para este fim. Neste estudo explora-se o papel dos dados obtidos pelo satélite Sentinel-2, nomeadamente na deteção, mapeamento e monitorização do jacinto-de-água (Eichhornia crassipes) em meio fluvial, dando-se como exemplo a aplicação desta tecnologia no estudo desta invasora aquática em cursos de água na região do Baixo Mondego (Portugal). Para o efeito usam-se índices de vegetação calculados a partir de imagens multiespectrais. Esta abordagem pode dar uma contribuição importante na definição de medidas oportunas de gestão com vista ao controlo da infestação de massas de água por jacinto-de-água, que são fundamentais ao pleno desempenho das múltiplas funções dessas massas de água, e prevenção do risco ambiental associado.
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