For areas with the diverse contamination sources, the change of 4-nitrophenol contamination and impact of potential contamination sources have been evaluated using monitoring data and a numerical model (HydroGeoSphere). The model considered several parameters including land cover, precipitation, and flow rate. And, the model has been performed to investigate the effect of decay rate of 4-nitrophenol. The results of the simulations showed that the influence on 4-nitrophenol in downstream was mainly greater than that in upstream, and the tributaries did not significantly affect the mainstream because of their low flow rates. In addition, the effect of contamination sources was simulated for each section, then the measured data were higher than the corresponding simulated data in most sections of the Geumho river. In particular, the impact of the potential contamination sources in the upstream area was much higher than that in the other area, thus more monitoring data for the upstream area is required.

Abstract
 1. 서 론
 2. 연구 방법
  2.1. 대상 유역
  2.2. 모형 선정 및 적용
  2.3. 입력자료 구성
  2.4. 대상 유해물질 조사
 3. 연구 결과
  3.1. 유량 보정 결과
  3.2. 상류 측정 결과를 이용한 4-nitrophenol 농도변화 모의
  3.3. 구간별 오염 기여도 산정과 오염원 영향 평가
 4. 결 론
 REFERENCES

• 박경덕(부경대학교 환경공학과) | Kyeong-Deok Park (Department of Environmental Engineering, Pukyong National University)
• 신동석(국립환경과학원 낙동강물환경연구소) | Dong-Seok Shin (Nakdong River Environment Research Center)
• 양득석(국립환경과학원 낙동강물환경연구소) | Duk-Seok Yang (Nakdong River Environment Research Center)
• 이인정(국립환경과학원 낙동강물환경연구소) | Injung Lee (Nakdong River Environment Research Center)
• 임영경(국립환경과학원 낙동강물환경연구소) | Young-Kyong Lim (Nakdong River Environment Research Center)
• 김일규(부경대학교 환경공학과) | Il-Kyu Kim (Department of Environmental Engineering, Pukyong National University) Corresponding author