Model of Non-equilibrium Multiphase Contaminant Transport in Lake Water-Sediment System

Autor: Benedikta Lukšienė, Eva Koviazina, Šarūnas Buivydas, Evaldas Maceika, Vitold Filistovič, Nikolaj Tarasiuk, Andrius Puzas, Marina Konstantinova
Rok vydání: 2015
Předmět:
Zdroj: Water, Air, & Soil Pollution. 226
ISSN: 1573-2932
0049-6979
DOI: 10.1007/s11270-015-2455-x
Popis: The model of contaminant transport between the abiotic components of the lake water-sediment sys- tem is presented. The implementation of the model, which uses radioactive material as a contaminant, and the evaluation of parameter values are discussed in the work. A semi-analytical solutionofthesimulationofthe dynamics of contaminant transport in the lake water and one-dimensional sediment solute transport including non-equilibrium processes is presented. The model in- cludes a concept of dynamics of the contaminant sorp- tion in lake water and sediment compartments, consid- ering the specific porous structure of sediments, the contaminant material exchange between the liquid and solid phases of sediments. The key processes included in the model are sedimentation, resuspension, diffusive exchange of solute at the lake water-sediment interface and advection-diffusion in sediment solute. Modelling of the contaminant transport in both spheres (lake water and bottom sediments) is influenced by non-equilibrium and transformation reactions. Special attention was paid to the contamination balance between the two spheres in the interface area. The ranges of bound- ary and initial conditions were extended, and final results were obtained using an accurate and robust nu- merical inversion calculation based on the De Hoog algorithm. Therefore, the model can be used in experimental measurements interpreting the contami- nantprofileinlakesedimentsaswellasapartassociated with the comprehensive determination of the volumetric activity, in the estimation of irradiation doses due to radionuclides released into the lake water.
Databáze: OpenAIRE
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