In the Geumho River, 4-nitrophenol has been detected, thus it is necessary to investigate the contamination sources in order to prevent the release of this compound. However, the research to estimate the potential source is regarded as complicated research. In this study, the distributions of 4-nitrophenol were simulated and the contribution of the potential sources was estimated using a numerical model(HydroGeoSphere; HGS) and the measuring data of 4-nitrophenol from 2013 to 2017. The altitude data, the land cover data, the flow rates of the tributaries and wastewater treatment plants, and the decay rate of 4-nitrophenol was used as the input data. The results of this research showed that the contribution rates of potential contamination sources in the upstream area were higher than that of the downstream area. Most of the upstream area is the agricultural area, it seemed that 4-nitrophenol was originated from the pesticides. In order to achieve more specific location of sources, an intensive investigation in the upstream is required.

ABSTRACT
 1. 서 론
 2. 연구방법
  2.1 수치모형 선정
  2.2 대상유역
  2.3 대상 유해물질 조사
  2.4 모형 입력값 및 연구방법
 3. 결 과
  3.1 유량 보정 및 부하량 산정 결과
  3.2 구간별 기여율 산정 결과
 4. 결 론
 References

• 박경덕(부경대학교 마린융합디자인협동과정) | Kyeong-Deok Park (Interdisciplinary Program of Marine Convergence Design, Pukyong National University)
• 양득석(낙동강물환경연구소) | Duk-Seok Yang (Nakdong River Environment Research Center)
• 이인정(낙동강물환경연구소) | In-Jung Lee (Nakdong River Environment Research Center)
• 김일규(부경대학교 환경공학과) | Il-Kyu Kim (Department of Environmental Engineering, Pukyong National University) Corresponding author