Modeling of Phosphorus Transport in Swan Lake
2006-08
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Modeling of Phosphorus Transport in Swan Lake
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2006-08
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St. Anthony Falls Laboratory
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Report
Abstract
As part of the work plan for a Swan Lake nutrient study, St. Anthony Falls Laboratory was
asked to assess phosphorus transport through the lake water column assuming the
Minnesota Steel Industries (MSI) mining operations would increase internal loading of
phosphorus to the lake and would therefore reduce water clarity of the lake. To assess
phosphorus concentration in the surface mixed layer of Swan Lake due to internal loading,
a two step water quality modeling was approach was selected.
In the first step the lake water quality model MINLAKE was used to simulate the depth of
the surface mixed layer, the turbulent diffusion coefficients below the surface mixed layer,
and the dissolved oxygen (DO) concentration through the water column to determine the
timing of anoxic conditions. In the second step, the above information was input to a onedimensional
diffusion equation to simulate the transport of phosphorus as a conservative
material through the lake water column, i.e. no phosphorus uptake by algae or settling was
simulated.
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474
474
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Minnesota Department of Natural Resources
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Mohseni, Omid; Stefan, Heinz. (2006). Modeling of Phosphorus Transport in Swan Lake. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/113680.
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