Análise da distribuição granulométrica ao longo da Bacia Hidrográfica do Rio Meia Ponte – Goiás
Keywords:
Transporte de Sedimentos; Granulometria; Difração a laser;Abstract
O rio é um dos principais meios de transporte de sedimentos, sendo estes provenientes de processos erosivos que ocorrem na superfície, causados pela ação de agentes dinâmicos externos como o vento, gravidade, gelo e agentes biológicos. Os sedimentos presentes nos rios possuem certas granulometrias, que podem variar de argila e areia média, onde permanecem suspensos pelo fluxo turbulento e são transportados a jusante do canal. Devido à importância de conhecer os dados granulométricos dos recursos hídricos para uma boa gestão e planejamento, este artigo propôs caracterizar a granulometria dos sedimentos suspensos em seções da Bacia Hidrográfica do Rio Meia Ponte -Go, como ainda comparar métodos modernos de determinação granulométrica, através dos equipamentos LISST-SL e MASTERSIZER 2000. Foi observado que a granulometria dos sedimentos tende a diminuir de montante a jusante, e que houve uma diminuição do diâmetro médio (d50) do período de estiagem a o chuvoso. Com base na comparação dos granulômetros, obtivemos uma diferença 15 % para a seção 2, e de 20% para a seção 3, em relação de um método a outro. O LISST – SL apresentou resultados satisfatórios, porem requer cuidados quanto a calibração.
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