Multifunctional weirs constructed through the Four Major Rivers Restoration Project are operated as management water levels. The purpose of this study was to evaluate the effect of water level in the main stem on the tributary water level according to multifunctional weir operation, because the operation of multifunctional weirs for water level management influences the drainage of tributaries. In this study, water level pressure gauges were installed and spatial and temporal water quality was observed. The LOcally Weighted Scatterplot Smoothing (LOWESS) technique was applied to the Nakdong River and the Baekcheon Junction, both upstream of the Gangjeong-Goryeong weir, in order to analyze water quality trends. When considering the overall analysis and observations, it was found that the water quality forecasting point located at the Baekcheon estuary point should be transferred to the Dosung Bridge, which is located upstream of the Sunwon Bridge.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 대상유역
  2.2. 연구방법
 3. 결과 및 고찰
  3.1. 시간적 수위․수질관측 결과
  3.2. 공간적 수질 관측 결과
  3.3. 수위 정체에 따른 수질추세
 4. 결 론
 REFERENCE

• 안정민(국립환경과학원 낙동강물환경연구소) | Jung Min Ahn (National Institute of Environmental Research, Nakdong River Environment Research Center)
• 임태효(국립환경과학원 낙동강물환경연구소) | Teo Hyo Im (National Institute of Environmental Research, Nakdong River Environment Research Center)
• 김성민(국립환경과학원 낙동강물환경연구소) | Sung Min Kim (National Institute of Environmental Research, Nakdong River Environment Research Center)
• 김 신(국립환경과학원 낙동강물환경연구소) | Shin Kim (National Institute of Environmental Research, Nakdong River Environment Research Center)
• 김경훈(국립환경과학원 낙동강물환경연구소) | Gyeong Hoon Kim (National Institute of Environmental Research, Nakdong River Environment Research Center)
• 권헌각(국립환경과학원 낙동강물환경연구소) | Heon Gak Kwon (National Institute of Environmental Research, Nakdong River Environment Research Center)
• 신동석(국립환경과학원 낙동강물환경연구소) | Dongseok Shin (National Institute of Environmental Research, Nakdong River Environment Research Center)
• 양득석(국립환경과학원 낙동강물환경연구소) Corresponding author