2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/26/2021 | 8:30 AM - 10:30 AM | PHOSPHORUS MONITORING AND INTERNAL LOADING INFORM DELISTING FOR MUSKEGON LAKE AREA OF CONCERN | Virtual Platform

PHOSPHORUS MONITORING AND INTERNAL LOADING INFORM DELISTING FOR MUSKEGON LAKE AREA OF CONCERN

Muskegon Lake was listed as a Great Lakes Area of Concern (AOC) in 1985 due to a long history of environmental abuse and was designated with nine beneficial use impairments, including eutrophication or undesirable algae. Years of industrial discharge and loss of coastal wetland habitat led to total phosphorus concentrations >60 ug/L prior to 1974. The federal Clean Water Act reduced these discharges and TP concentrations have averaged ~25 ug/L in recent years. However, recent observations indicate increasing TP concentrations in the hypolimnion, suggesting internal phosphorus loading (IPL) may be occurring, while dissolved oxygen concentrations suggest mid-lake hypoxia may be inducing IPL. When applying laboratory-measured sediment phosphorus release rates to scenarios of various annual oxic and anoxic conditions, IPL was estimated to account between 2.3% and 25.8% of total phosphorus load to Muskegon Lake annually. Results suggest IPL can be an important source of phosphorus in Muskegon Lake, but this impact will be localized spatially and limited temporally.

Monitoring
Nutrient cycling
Biogeochemistry

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Presenters/Authors

Michael Hassett (), Annis Water Resources Institute - Grand Valley State University, hassetmi@gvsu.edu;