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- W2045780541 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 significant finding of the study is that the dissolved concentration in all simulations of the kinetic model was highest well away from the point of dredging. Maximum dissolved chemical concentrations were predicted to occur between 4 and 13 h after resuspension or 2.5 to 7 km downstream depending on the desorption kinetics. A downstream maximum, if verified in the field, changes the conventional view of dredge impacts in terms of exposure for humans and the ecology in aquatic systems." @default.
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- W2045780541 date "2007-12-01" @default.
- W2045780541 modified "2023-09-27" @default.
- W2045780541 title "A Kinetic Model of Short-Term Dissolved Contaminant Release during Dredge-Generated Bed Sediment Resuspension" @default.
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- W2045780541 doi "https://doi.org/10.1089/ees.2007.0017" @default.
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