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Water Res. 2004 Dec;38(20):4446-54.

A practical application of Droop nutrient kinetics (WR 1883).

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US Army Engineer Research and Development Center, Mail Stop EP-W, 3909 Halls Ferry Road, Vicksburg, MS 39180, USA.


Algal growth kinetics based on internal phosphorus concentration were incorporated into an existing eutrophication model. Application to a closed system resulted in damped oscillations in algal biomass and phosphate relative to a model with fixed composition. Peak biomass did not differ substantially, however, from that attained using a model with fixed, minimal phosphorus-to-carbon ratio. Sensitivity analyses were conducted following model application to the lower St. Johns River, Florida. Factor-of-two changes in key parameters had little influence on computed chlorophyll. Varying model parameters exerted a larger influence on dissolved phosphate concentration. We conclude Droop kinetics present a mechanism for regulating computed nutrient concentrations rather than computed chlorophyll concentrations.

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