General features of sediment budget for the Nakdong River before the Four Rivers Restoration Project were analyzed using surveying, dredging, and mining data for the past 20 years, as well as sediment data measured from the tributaries, and numerical modeling, etc. As a result of the sediment budget analysis of the Nakdong River before the Four Rivers Restoration Project, sediment inflow supplied from the watershed is 2,100,000 m3/yr and sediment outflow including mining and dredging volumes is 10,180,000 m3/yr. Therefore, the bed change volume estimated by the sediment budget analysis is -8,080,000 m3/yr of the bed erosion volume which is similar to the analysis result (-8,300,000 m3/yr) of natural and artificial bed changes using the surveyed data.

1. 서 론
 2. 연구방법 및 범위
 3. 낙동강의 장기하상변동 추이
 4. 유사수지 및 하상변동량 특성 분석
  4.1. 하도준설 및 토사유입 특성
  4.2. 실측자료를 활용한 하상변동량 분석
 5. 결 론
 감사의 글
 참고문헌

• 손광익(영남대학교 공과대학 건설시스템공학과) | Son, Kwang Ik
• 지운(한국건설기술연구원 수자원·하천 연구소) | Ji, Un Corresponding author