2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 9:15 AM - 9:30 AM | DROUGHTS, INTERNAL AND EXTERNAL NUTRIENT SUPPLIES, AND TOXIC CYANOBACTERIA OUTBREAKS IN POTABLE SOURCE WATERS OF THE SOUTHEAST | 306B
DROUGHTS, INTERNAL AND EXTERNAL NUTRIENT SUPPLIES, AND TOXIC CYANOBACTERIA OUTBREAKS IN POTABLE SOURCE WATERS OF THE SOUTHEAST
Many potable source waters in the southeastern U.S. are being threatened by excessive droughts as accelerated global warming progresses. These waters are also being degraded with excessive nutrients (nitrogen, phosphorus) that are stimulating toxic cyanobacteria outbreaks and exacerbating their impacts. We considered several potable source waters in the Southeast, including their water residence times, nutrient levels, recent climatic forcing from droughts, hypoxia/anoxia in their water columns, evidence of sediment nutrient pumping, and what is known about the status of their cyanobacteria blooms. Key environmental factors that are most conducive for cyanobacteria in these systems were evaluated to forecast how they will change as accelerated climate change continues. The analysis indicates that both inorganic nitrogen and inorganic phosphorus will need to be decreased significantly, back to limiting levels, to reduce recurring toxic cyanobacteria blooms; that there will be a substantial lag in system response due to reduced flushing rates and nutrient sediment pumps; and that toxic cyanobacteria outbreaks will continue to increase until excessive phosphorus and nitrogen supplies are reduced and flushing is increased.
- C24 Eutrophication
- C36 Water Resource Management
- S20 Understanding physical controls on cyanobacteria dominance: toward prediction and prevention
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Presenters/Authors
JoAnn Burkholder
(), North Carolina State University, jburk@ncsu.edu;
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Elle Allen
(), North Carolina State University, ehallen@ncsu.edu;
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