HR: 0800h
AN: H31D-1338    [Abstracts]
TI: Modeling Transport and Transformation of Dissolved and Sediment Associated Mercury in Rivers
AU: * Massoudieh, A
EM: amassoudieh@ucdavis.edu
AF: University of California, Davis, Civil & Environmental Engineering University of California, Davis One Shields Ave., Davis, CA 95616 United States
AU: Ginn, T R
EM: TRGinn@ucdavis.edu
AF: University of California, Davis, Civil & Environmental Engineering University of California, Davis One Shields Ave., Davis, CA 95616 United States
AU: Bombardelli, F A
EM: fabombardelli@ucdavis.edu
AF: University of California, Davis, Civil & Environmental Engineering University of California, Davis One Shields Ave., Davis, CA 95616 United States
AB: Mercury is a hazardous metal in the environment. In many cases, the presence of mercury in water bodies is in the form of a distinct, high-concentration-mercury layer in the bed sediments that is often buried but can be exposed due to erosion of the top layer. In this research, a one-dimensional flow and transport model representing the transport of mercury in the river is coupled with several one-dimensional models incorporating diffusive transport, transformation and sorption of mercury species in the bed sediments. Transport of dissolved and particle associated mercury in the water, and thus the effect of erosion and resuspension of particles on the transport process is taken into consideration. A set of one-dimensional reactive transport sub-models are utilized to model the release, adsorption, and burial of mercury species to the bed sediments. Also, the coupled transport and transformation of a wide variety of mercury species as well as biomass and organic matter which are effective in production of Methyl-Mercury are implemented into the model. Model parameters are obtained using available thermodynamics databases and by calibration of the one-dimensional reactive transport model to available column and batch study data. The model can be used for predicting transport of mercury and production of methyl-mercury, examining various remediation scenarios, and evaluating the effect of anthropological activities on resuspension or burial of mercury species in water systems after doing appropriate calibrations.
DE: 1051 Sedimentary geochemistry
DE: 1847 Modeling
DE: 1849 Numerical approximations and analysis
DE: 1862 Sediment transport (4558)
DE: 1871 Surface water quality
SC: Hydrology [H]
MN: Fall Meeting 2005