Abstract
Eutrophication has been a worldwide lake pollution problem, caused by the presence of excessive nutrients in lakes. The nutrients can come from an external or internal source. The release of phosphorous (P) from resuspended sediments from the lake bottom is a significant internal source. This paper discusses how to effectively control such a release. We considered using artificial circulation technique, and carried out CFD modelling of circulation triggered by air-bubble injection into the lake water. The simulations are based on the RANS equations. We predicted distributed water and air-bubble velocities, as well as air volume fraction. The predictions compare well with experimental data. Turbulent eddy motions cause oxygenated surface water to flow downward and effectively mix with bottom water. The air bubbles directly enhance the dissolved oxygen level. Both mechanisms would inhibit the release of P from bottom sediments. Using proper methods for interphasal forces and turbulence closure is the key to success.
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This study received financial support through Discovery Grants held by S.S. Li and C.N. Mulligan
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Najafi-Nejad-Nasser, A., Li, S.S., Mulligan, C.N. (2016). Application of CFD Modelling to the Restoration of Eutrophic Lakes. In: Bélair, J., Frigaard, I., Kunze, H., Makarov, R., Melnik, R., Spiteri, R. (eds) Mathematical and Computational Approaches in Advancing Modern Science and Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-30379-6_26
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DOI: https://doi.org/10.1007/978-3-319-30379-6_26
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