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Florida Lake Management Society Annual Conference, Naples, Florida, June 4 – 7, 2007

WATER QUALITY MODELING OF LAKE JESUP USING QUAL2K

Scott A. Lowe Manhattan College HDR|LMS Engineers

A QUAL2k water quality model of Lake Jesup was developed to help quantify the internal dynamics of the Lake. The model has been calibrated using an extensive, long term (15 years), field data set that is available for lake. Initial efforts at calibrating the model to reproduce the severely eutrophied state of lake were poor. There was not enough external nutrient loading to the lake to reproduce the internal conditions that were being measured. To increase the nutrient loadings internal loads were increased by increasing the sediment nutrient fluxes until a reasonable calibration was obtained. Based on these results a field sampling program was initiated to measure the actual sediment fluxes in the lake. Remarkably, the measured fluxes actually matched those predicted by the model reasonably well.

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NOTES

Session 5A – Page 5

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