In this study, the sensitivity analysis of bed changes due to the various sediment transport equations have been conducted for 80 km reach of the Lower Nakdong River using the HEC-6 which is one dimensional numerical model. The bed elevation changes according to the different sediment transport formulas were compared and analyzed quantitatively. As a result of the numerical simulation, the final bed elevation calculated by Engelund and Hansen(1967), Ackers and White(1973), and Yang(1979) formulas was similar to one another in configuration. The bed change simulated by Engelund and Hansen(1967) were greatest among them, for example, 5.5 m deposition and 2.9 m erosion for 100 years. Also, in the case of Toffaleti (1969) equation, the maximum bed deposition of 8.04 m after 100 years was induced at the 73 km location upstream of the Nakdong River Estuary Barrage. Meyer-Peter-Müller(1948) and Wilcock(2001) formulas produced the deposition only at the upstream end and there was little bed change in the downstream area. The unreal bed configuration of continuously up and down pattern was simulated by Laursen(1958) transport equation.

Abstract
 1. 서 론
 2. HEC-6 모형 및 유사량 공식
 3. 적용대상 하천 및 입력자료
  3.1. 낙동강 하류
  3.2. HEC-6 모형 입력자료
 4. 모의 결과 및 분석
 5. 결 론
 참 고 문 헌

• 여운광(명지대학교 토목환경공학과) | Woon Kwang Yeo (Department of Civil and Environmental Engineering, Myongji University)
• 지운(명지대학교 토목환경공학과) | Un Ji (Department of Civil and Environmental Engineering, Myongji University) Corresponding Author
• 정원준(명지대학교 토목환경공학과) | Won Jun Jeong (Department of Civil and Environmental Engineering, Myongji University)