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Modeling blue green algal blooms in the lower neuse river north carolina usa


Modeling blue green algal blooms in the lower neuse river north carolina usa



Water Research 22(7): 895-906



ISSN/ISBN: 0043-1354

Over the past decade, segments of the lower Neuse River between Kinston and New Bern, N.C. revealed alarming symptoms of advanced eutrophication, culminating in the appearance and persistence of nuisance blue-green algal blooms. A mathematical model of the lower Neuse River has been developed to help evaluate control alternatives. The model includes differentiation between four phytoplankton groups: diatoms, green algae and blue-green algae (nitrogen fixing and non-nitrogen fixing). Other water quality constituents modeled included nitrogen and phosphorus components and dissolved oxygen. The water column is partitioned into two layers and the associated mass transport pattern is incorporated. The model is able to mimic the seasonal trends of algal biomass, nutrient and dissolved oxygen levels observed in 1983, 1984 and 1985, each year having a different hydrologic pattern. Comparisons of model calibration results suggest that freshwater flow and associated mixing conditions in the river play a major role in initiating and maintaining blue-green blooms when sufficient nutrient supplies are present.

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Accession: 005909329

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