Development of a Dissolved Oxygen TMDL for Brunswick River Using a 2-D Hydrodynamic and Water Quality Model
Rodriguez, Hugo N.
Peene, Steven J.
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St. Simons Sound and Brunswick River are located in an estuary along the Atlantic Coast approximately 80 miles south of Savannah, Georgia, and 70 miles north of Jacksonville, Florida. They were placed on the 303(d) list for dissolved oxygen. As prescribed under the Clean Water Act, a Total Maximum Daily Load (TMDL) has been determined for these listed reaches. In order to determine the allowable TMDL for oxygen demanding material considering the potential impacts of ongoing point source, non-point source, marsh loadings, and benthic conditions, a two-dimensional hydrodynamic, transport, and water quality model was developed. The primary point source discharge to the system is a paper mill along the Brunswick River. The Environmental Fluid Dynamics Code (EFDC) hydrodynamic model was utilized along with the Water Quality Analysis Simulation Program (WASP). The model system provides accurate simulations of the circulation and transport within the system, this was verified through simulation of salinity. The model projected an allowable TMDL and referenced that allowable loading to natural and anthropogenic sources.