낙동강 하굿둑 운영방법에 따른 상류 둔치부 홍수위 검토

Abstract

This study investigates the effect of different operation rules of the Nakdong River Estuary Barrage on change in flood water level. We employ 1-D numerical model, HEC-RAS to predict the flood water level at each eco-park in the floodplain in response to increasing flood inflows. Numerical results show that flooding at the eco-park occurs when the expected size-floods range from 1.1-year to 3.0-year frequent. It means that flood damage would occur before the extreme flood events with flooding warning issued by the Korean Flood Control Office. Thus extension of the flood levels issued by the Flood Control Office(FCO) is recommended for the safety of visitors to the echo parks. We predict numerically the decrease of flood water level when all sluice gates in the barrage are opened. The results show that the decrease of flood water level approximately ranging from 10 to 20cm can be obtained when the all gates of Nakdong River Estuary Barrage are opened together to discharge flood.