As part of the Four Major Rivers Restoration Project, multifunctional weirs have been constructed in the rivers and operated for river-level management. As the weirs play a role in draining water from tributaries, the aim of this study was to determine the influence of the weirs on the water level of the Nam River, which is one of the Nakdong River’s tributaries. Self-organizing maps (SOMs) and a locally weighted scatterplot smoothing (LOWESS) technique were applied to analyze the patterns and trends of water level and quality of the Nakdong River, considering the operation of the Changnyeong-Haman weir, which is located where the Nam River flows into the Nakdong River. The software program HEC-RAS was used to find the boundary points where the water is well drained. Per the study results at the monitoring points ranging between the junction of the two rivers and 17.5 km upstream toward the Nam River, the multifunctional weir influenced the water level at the Geoyrong and Daesan observation stations on the Nam River and the water quality based on automatic monitoring at the Chilseo station on the Nakdong River was affected strongly by the Nakdong River and partly by the Nam River.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 대상유역
  2.2. 연구방법
 3. 결과 및 고찰
 4. 결론
 REFERENCE

• 양득석(국립환경과학원 낙동강물환경연구소, National Institute of Environmental Research, Nakdong River Environment Research Center) | Deuk Seok Yang
• 임태효(국립환경과학원 낙동강물환경연구소, National Institute of Environmental Research, Nakdong River Environment Research Center) | Teo Hyo Im
• 이인정(국립환경과학원 낙동강물환경연구소, National Institute of Environmental Research, Nakdong River Environment Research Center) | In Jung Lee
• 정강영(국립환경과학원 낙동강물환경연구소, National Institute of Environmental Research, Nakdong River Environment Research Center) | Kang Young Jung
• 김경훈(국립환경과학원 낙동강물환경연구소, National Institute of Environmental Research, Nakdong River Environment Research Center) | Gyeong Hoon Kim
• 권헌각(국립환경과학원 낙동강물환경연구소, National Institute of Environmental Research, Nakdong River Environment Research Center) | Heon Gak Kwon
• 유제철(금오공과대학교 환경공학과, Department of Environment Engineering, Kumoh National of Technology) | Je-Chul Yoo
• 안정민(국립환경과학원 낙동강물환경연구소, National Institute of Environmental Research, Nakdong River Environment Research Center) | Jung Min Ahn Corresponding author