Numerical Modeling of Flow and Mercury Distribution in Enid Lake, Mississippi

Author(s): Chao, X.; Hossain, A.; Cizdziel, J.; Jia, Y.

The Yazoo River Basin is the largest basin in Mississippi. Four large flood control reservoirs: Arkabutla Lake, Sardis Lake, Enid Lake and Grenada Lake, are located in this region, providing significant natural and recreational resources. The soils in this region are highly erodible, resulting in a large amount of sediment discharged into the water bodies. Sediments are normally associated with many pollutants and greatly affect water quality and aquatic lives. Mercury concentrations in water, sediment and fish in Enid Lake are relatively high, and a fish consumption advisory was issued by Mississippi Department of Environmental Quality (MDEQ) in 1995. In this study, a numerical model was developed based on CCHE3D, a three-dimensional free surface hydrodynamic, sediment and water quality model to simulate the flow, sediment and mercury distributions in Enid Lake. Total mercury in water and sediment were simulated, and the major processes, including advection, diffusion, adsorption/desorption, bed release, atmosphere deposition, settling, etc., were considered in the model. This model was calibrated and validated using field measurements and remote sensing data. This model provides useful tools for understanding the fate and transport of mercury in natural lakes.

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