Numerical modeling of sedimentation control scenarios in the approach channel of the Nakdong River Estuary Barrage,South Korea  

作　　者：Un Ji Eun-Kyung Jang Gwonhan Kim 

机构地区：[1]Hydro Science and Engineering Research Institute,Korea Institute of Civil Engineering and Building Technology [2]Department of Construction Environment Engineering,Korea University of Science and Technology [3]Department of Water Resources,Dongil Engineering Consultants Co.

出　　处：《International Journal of Sediment Research》2016年第3期257-263,共7页国际泥沙研究（英文版）

基　　金：supported by Korea Institute of Civil Engineering and Building Technology(Project name:Development of Floodplain Maintenance Technology for Enhancement of Waterfront Values)

摘　　要：The effects of sedimentation reduction at the Nakdong River Estuary Barrage （NREB） in Korea were quantitatively analyzed with respect to different sediment control methods using the calibrated and validated two-dimensional model. The countermeasures of sediment dredging, sediment flushing, channel geometry change, and a combination of flushing and channel geometry change were examined for the approach channel of the NREB. The flood event and channel geometries of the 3.8 km section upstream of the NREB surveyed before and after dredging in 2007 were used for modeling conditions. As a result, the half of sediments dredged in 2007 could be eliminated naturally by floods without dredging. The numerical simulation of sediment flushing indicated that the deposition height decreased in the entire simulation section with the minimum and maximum reductions from 0.3 m to 1.3 m in deposition height. The channel contraction method produced quantitatively the largest amount of sedimentation reduction and sediment flushing and dredging followed. Sedimentation reduction by a combination of flushing and channel contraction was up 10% compared to the individual method of channel contraction,The effects of sedimentation reduction at the Nakdong River Estuary Barrage （NREB） in Korea were quantitatively analyzed with respect to different sediment control methods using the calibrated and validated two-dimensional model. The countermeasures of sediment dredging, sediment flushing, channel geometry change, and a combination of flushing and channel geometry change were examined for the approach channel of the NREB. The flood event and channel geometries of the 3.8 km section upstream of the NREB surveyed before and after dredging in 2007 were used for modeling conditions. As a result, the half of sediments dredged in 2007 could be eliminated naturally by floods without dredging. The numerical simulation of sediment flushing indicated that the deposition height decreased in the entire simulation section with the minimum and maximum reductions from 0.3 m to 1.3 m in deposition height. The channel contraction method produced quantitatively the largest amount of sedimentation reduction and sediment flushing and dredging followed. Sedimentation reduction by a combination of flushing and channel contraction was up 10% compared to the individual method of channel contraction,

关 键 词：Channel contraction Nakdong River Estuary Barrage Sediment dredging Sediment flushing Sedimentation reduction 

分 类 号：TV147[水利工程—水力学及河流动力学] TV851