Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Development of response terms for contaminant transport in two-dimensional model for mixing analysis of toxic chemicals in rivers

하천에 유입된 유해화학물질의 혼합 해석을 위한 2차원 오염물질 이동모형 반응항 개발

  • 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)
  • 신동빈 (서울대학교 공과대학 건설환경공학부) ;
  • 신재현 (서울대학교 공과대학 건설환경공학부) ;
  • 서일원 (서울대학교 공과대학 건설환경공학부)
  • Received : 2019.08.09
  • Accepted : 2020.02.28
  • Published : 2020.02.29
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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.

우리나라에서 일어나는 하천 내 유해화학물질 유입사고 발생건수는 매년 증가하는 추세를 보이고 있다. 이에 대응하기 위해 국가차원의 수질오염 사고대응체계를 구축하여 사고방재를 위한 체계적인 절차를 수립하였으나, 우리나라의 사고대응체계는 해외의 수질모형을 차용하고 있기 때문에 모형의 매개변수 입력 및 검보정에 어려움이 있다. 이에 따라 본 연구는 하천에 유출된 유해화학물질의 거동을 분석하기 위한 수심 평균 2차원 하천수질모형을 개발하고, 유해화학물질의 특성을 고려한 유의반응항 판별을 통해 효율적 모의수행을 위한 기법을 제시하였다. 수심 평균 2차원 하천수질모형인 CTM-2D에 흡·탈착, 휘발 반응을 재현할 수 있는 반응항을 추가하고, 이를 검증하기 위해 해석해와 수치해를 비교한 결과 0.1% 미만의 오차를 보여 모형의 타당성을 입증하였다. 또한 낙동강-금호강 합류부에 수질오염사고 가상시나리오를 구성하여 개발된 모형을 적용하였으며, 민감도 분석 기반 유의반응 판단을 통해 효율적 수질모의를 수행할 수 있었다.

Keywords

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