Abstract
Sediment particles can be displaced from the bed to the water column by both natural processes and human activities. Navigational and environmental dredging operations are known to generate particularly high concentrations of suspended sediment and have a significant environmental impact. Once contaminated particles are resuspended a fraction of particle-sorbed chemical is dissolved and equilibrium models are typically used to estimate chemical release. A kinetic model using a mass balance approach incorporating dredgehead particle generation, particle settling, biphasic desorption, flux from the sediment bed, and evaporation to air has been developed for plug-flow stream hydraulics. A key model output for steady-state dredging is concentration in water vs. distance downstream. Typical results for mechanical and hydraulic dredges operating at two sites, the Fox River and Indiana Harbor Canal, will be presented. The kinetic model shows lower concentrations than the equilibrium model in all cases. The most ...
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