Key factors in vertical mixing processes in a reservoir bordering the Pantanal floodplain,Brazil |
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| Authors: | Ibraim Fantin-Cruz Olavo Pedrollo Cláudia C Bonecker Peter Zeilhofer |
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| Institution: | 1. Departamento de Engenharia Sanitária e Ambiental, Universidade Federal de Mato Grosso, Cuiabá, Brazil;2. Instituto de Pesquisas Hidráulicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazilibraimfantin@gmail.com;4. Instituto de Pesquisas Hidráulicas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil;5. Núcleo de Pesquisas em Limnologia, Ictiologia e Aquicultura, Universidade Estadual de Maringá, Maringá, Brazil;6. Departamento de Geografia, Universidade Federal de Mato Grosso, Cuiabá, Brazil |
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| Abstract: | AbstractThe aim of this study was to understand seasonal variations in the vertical structure of the water column, and to quantify the importance of the physical forces (solar radiation, wind and hydraulic retention time) that control mixing processes in a reservoir bordering the Pantanal floodplain. Samples were taken every three months in the reservoir centre, at four depths, for the measurement of nine physical and chemical water quality parameters. The reservoir presented a long stratification period with complete mixing in winter. The vertical structure showed that, during the stratification period, the upper layers of the reservoir are homogeneous and the physical and chemical composition only changes at greater depths. The wind acting over an extended period is the only factor that significantly influences the vertical structure in the reservoir, giving rise to mixing processes. Moreover, the position of the draw-off point in the upper layer of the reservoir, together with the reservoir depth, enhances vertical stability. |
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| Keywords: | water quality stratification wind hydraulic retention time hydropower tropical reservoir |
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