Sediment discharge by long-term runoff in the Nakdong River watershed should be predicted for the maintenance and management of the Nakdong River newly changed by the four major river restoration project. The data establishment by the analysis of runoff and sediment discharge using the long-term watershed model is necessary to predict possible problems by incoming sediments and to prepare countermeasures for the maintenance and management. Therefore, sediment discharges by long-term runoff in the main points of the Nakdong River were calculated using SWAT(soil and water assessment tool) model and the relations and features between rainfall, runoff, and sediment discharge were analyzed in this study. As a result of sediment discharge calculation in the main points of the Nakdong River and tributaries, the sediment discharge at the outlet of the Naesung Stream was greater than the Jindong Station in the Lower Nakdong River from 1999 to 2008 except the years with low precipitation. The sediment discharge at the Nakdong River Estuary Barrage (NREB) was corresponding to 20% of the Jindong Station which is located about 80 km upstream from NREB.

Abstract
 1. 서 론
 2. 적용대상 유역 및 SWAT 모형의 개요
  2.1. 낙동강 유역 특성
  2.2. 장기 유역 유출 및 유사 모의를 위한 SWAT 모형
 3. 장기 유역모형 구축
  3.1. 지형자료 생성
  3.2. 강우 및 기상자료
 4. 실측자료를 이용한 모형 검보정
  4.1. 수문학적 보정 및 검증
  4.2. 유사량 보정 및 검증결과
 5. 장기 유역유출 유사량 분석
  5.1. 유사수지 현황 분석
  5.2. 유출량 및 유사량 산정 결과
 6. 결 론
 참 고 문 헌

• 지운(한국건설기술연구원) | Un Ji (River and Coastal Research Division, Korea Institute of Construction Technology)
• 장은경(한국건설기술연구원) | Eun-Kyung Jang (River and Coastal Research Division, Korea Institute of Construction Technology) Corresponding author
• 김태근(청주대학교 환경공학과) | Tae-Geun Kim (Department of Environmental Engineering, Cheongju University)
• 이은정(K-water 연구원) | Eun-Jeong Lee (Department of Water Management Research Team, K-Water)
• 류경식(K-water 연구원) | Kyong-Sik Ryoo (Department of Water Management Research Team, K-Water)
• 황만하(K-water 연구원) | Man-Ha Hwang (Department of Water Management Research Team, K-Water)