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http://dx.doi.org/10.3741/JKWRA.2020.53.2.141

Development of response terms for contaminant transport in two-dimensional model for mixing analysis of toxic chemicals in rivers  

Shin, Dongbin (Dept. of Civil and Environmental Engineering, Seoul National University)
Shin, Jaehyun (Dept. of Civil and Environmental Engineering, Seoul National University)
Seo, Il Won (Dept. of Civil and Environmental Engineering, Seoul National University)
Publication Information
Journal of Korea Water Resources Association / v.53, no.2, 2020 , pp. 141-154 More about this Journal
Abstract
The accidents of toxic chemical spill into rivers are increasing in recent years due to expansion of heavy industries in Korea. In order to respond to the chemical spills, accident response systems have been established for both main rivers and tributary rivers. However, since these accident response system adopted the water quality models imported from the foreign countries, it is difficult to acquire the model parameters and to calibrate and validate the water quality models. Therefore, this study developed a depth-averaged two-dimensional river water quality model to analyze the behavior of hazardous chemicals in rivers and proposed an efficient simulation execution framework by identifying the significant reaction mechanisms considering the characteristics of the toxic chemicals. The depth-averaged two-dimensional river water quality model CTM-2D was upgraded by adding reaction terms representing mechanisms of the adsorption, desorption, and volatilization of toxic chemicals. In order to verify the model, the analytical solution was compared with the numerical solution, and results showed that the error was less than 0.1%. In addition, the model was applied to a virtual scenario which is a water pollution accident at the confluence of the Nakdong River - Kumho River, and model results showed that an efficient simulation could be carried out by activating only significant reactions which were assessed by the sensitivity analysis.
Keywords
River water quality modeling; Toxic chemicals; Accident response system; Two-dimensional model; Absorption-desorption; Volatilization; Sensitivity analysis;
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