In this study, we analyzed on-site monitoring data for 15 tributaries in Geumho watersheds for 3 years (2011-2013) in order to sort out priorities on water quality characteristics and improvement. As a result of estimating contribution to contamination of the tributary rivers, Dalseocheon showed the highest load densities, despite the smallest watershed area, with 22.7% BOD5, 30.7% CODMn, 31.3% TOC and 47.6% TP. After conducting PCA (principal component analysis) and FA (factor analysis) to analyze water quality characteristics of the tributary rivers, the first factor was classified as CODMn, TOC, EC, TP and BOD5, the second factor as pH, Chl-a and DO, the third factor as water temperature and TN, and the fourth factor as SS and surface flow. In addition, arithmetical sum of each factor’s scores based on grading criteria revealed that Dalseocheon and Namcheon were classified into Group A for their highest scores - 96 and 93, respectively -, and selected as rivers that require water environmental management measures the most. Also, water environmental contamination inspection showed that Palgeocheon had the most number of aquatic factors to be controlled: BOD5, CODMn, SS, TOC, T-P, Chl-a, etc.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 대상유역
  2.2. 수질 및 유량조사
  2.3. 수질오염물질별 분포 특성 분석
  2.4. 수질요인간의 통계분석
  2.5. 실측 유달부하량에 의한 기여율 산정
  2.6. 수질부하밀도 산정
  2.7. 수질개선 등급화방안
 3. 결과 및 토의
  3.1. 지류하천의 수질 및 유량 특성
  3.2. 지류하천의 오염기여율 산정
  3.3. 유역분할을 통한 지류유역의 토지이용분석
  3.4. 자료의 다변량 통계분석 결과
 4. 결 론
 REFERENCES

• 정강영(국립환경과학원 낙동강물환경연구소, Nakdong River Environment Research Center, National Institute of Environmental Research) | Kang-Young Jung Corresponding author
• 안정민(국립환경과학원 낙동강물환경연구소, Nakdong River Environment Research Center, National Institute of Environmental Research) | Jung-Min Ahn
• 김교식(경북대학교 토목공학과, Department of Civil Engineering Kyungpook National University) | KyoSik Kim
• 이인정(국립환경과학원 낙동강물환경연구소, Nakdong River Environment Research Center, National Institute of Environmental Research) | In Jung Lee
• 양득석(국립환경과학원 낙동강물환경연구소, Nakdong River Environment Research Center, National Institute of Environmental Research) | Duk Seok Yang