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Environmental Engineering Research 2004;9(5): 201-213. DOI: https://doi.org/10.4491/eer.2004.9.5.201
EFFECT OF DENSITY FLOW REGIMES ON THE FATE OF A TOXIC SUBSTANCE IN A STRATIFIED RESERVOIR
Se-Woong Chung
Department of Environmental Eng., Chungbuk National University, Cheongju 361-763, Korea
Corresponding Author: Se-Woong Chung ,Tel: +82-43-261-3370, Fax: +82-43-272-3370, Email: schung@chungbuk.ac.kr
Received: July 22, 2004;  Accepted: September 21, 2004.
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ABSTRACT
The transport and fate of toxic chemicals in a stratified reservoir are closely related to density flow regimes in the reservoir. To better understand the behavior of toxic substances under reservoir stratification, a two-dimensional toxic model was developed and incorporated into the laterally integrated hydrodynamics and transport model, CE-QUAL-W2. To validate the model, it was applied to Shasta Reservoir, California where a spill of volatile toxic compound, methyl isothiocyanate (MJT'C) had happened and field data were secured during the spill. The predicted MITC concentrations were compared with that observed. The model showed a great performance in replicating the density flow regimes and fate of the MITC plume. The model was applied to identify the effect of two different density flow regimes, interflow and overflow on the degradation of MITC. The persistence of MITC was significant!)- influenced by different flow regimes. MITC was more persistent in the reservoir under interflow regime due to reduced volatilization from deep layers than under overflow condition. In the overflow situation, the plume moved more slowly toward dam and experienced greater degradation. The model can be effectively used to assist in making a contingent plan from toxicant spill, which may happen by accident or military purposes.
Keywords: Toxic model | density flow regimes | CE-QUAL-W2 | reservoir | contingent plan
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