||Developing Model of Benthic-Water Contaminant Transport in Bioturbated Sediment.
Davis, W. R. ;
Means, J. C. ;
||Environmental Research Lab., Narragansett, RI. ;Maryland Univ., Solomons. Chesapeake Biological Lab.
Sediment transport ;
Particle flux ;
Sea water ;
Water pollution ;
Chlorine aromatic compounds ;
Benthonic zone ;
Environmental exposure pathway
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||Chemicals entering marine waters are incorporated into distinct compartments and these reservoirs are in exchange with one another. The chemo-dynamic storage compartments in marine systems include sediment to the depth of bioturbation (0-50 cm), suspended sediments, dissolved phases (pore, ventilation and overlying water), and tissue residues. The key transport processes are particle flux across the sediment-water interface, vertical mixing within the bioturbation zone, and dissolved contaminant exchange between suspended particles or sediment and surrounding seawater or interstitial water. The key transport variables in entrainment are physical shear, bioturbation, and sediment cohesiveness. Vertical mixing may be mostly a function of the rate of conveyor-type feeding. Dissolved exchange between solid and dissolved phases is controlled by concentration gradients, partitioning relationships, organic matter, surface area, and sometimes redox conditions. Irrigated burrow systems account for most exchange of solutes and deep burial of newly deposited solids.
||Pub. in Proceedings of the EMBS (21st), Gdansk, Poland, September 14-19, 1986, p215-226 1989. Prepared in cooperation with Maryland Univ., Solomons. Chesapeake Biological Lab.
|NTIS Title Notes
||Reprint: Developing Model of Benthic-Water Contaminant Transport in Bioturbated Sediment.
||PC A03/MF A01