Numerical Simulation on Hydrodynamic Characterization Changes Associated with the Construction of Dikes and Dredging Operations in Saemangeum Lake

Abstract

The study area is located on the western coast, and the inner development construction has been ongoing since 2011. The purposes of current study are to effectively simulate and quantitatively predict a temporal and spatial distributions of water temperature and salinity due to the stages of inner development construction in saemangeum reclaimed area. The transient-state numerical modeling using EFDC model is done, and the numerical simulation results are validated reasonably by repetitive numerical model calibration procedures with respect to field measurements of water temperature and salinity. The spatial distributions of water temperature and salinity show similar trends before and after construction of the dikes. In spring season, the salinity has maximum value of 21 psu, while, in summer season, the salinity shows 7 psu in a whole modeling domain. Thus, it is clearly observed that salt water is replaced by freshwater. However, the salinity and temperature reach their initial conditions at the end of the year. The salinity after construction of the dikes is lower than that before construction of them at Mankyeong area. On the other hands, after construction of the dikes, the salinity after dredging operations is higher than that before dredging. Because drastical increasing of water volume in Saemangeum Lake leads to increasing of stagnation time at bottom layer, and salt water is easily intruded to the two estuaries. Therefore, it may be concluded that hydrodynamic characteristics on Saemangeum are dominated by either Mankyeong and Dongjin discharge or sluice gates in/out-flow amounts, and thus they must be properly considered when rigorous and reasonable predictions of water temperature and salinity according to the stages of inner development construction.

Prediction of desalination time of saemangeum reservoir

“…Location of the study area and layout of numerical simulation domain with monitoring points (modified from Oh et al , )…”

A Study on Appropriate Water Quality Management Measures Dependent on a Hydrodynamic Characteristics in Saemangeum Freshening Reservoir

“…및 준설에 의한 수리동역학적 특성(Oh et al, 2013)을 수치 모의를 하였다. 상기 모의 결과들은 앞서 언급한 바와 같이 새만금호 내부공사단계별 수질변화를 모의하였으나 주로 해수유통을 전제 조건으로 분석하였으며, 담수화 조건에서 의 수리동역학적 분석은 NIER(2015)에서 수행하였으나, 이 는 마스터플랜(MP)에서 제시된 최종안을 바탕으로 모델을 구축하고 수치 모의를 실시하였기 때문에 현재까지 실행 가능한 내부개발 여건이 반영된 수리동역학적 특성을 이해 하고 향후 장기적인 변화를 추론하는 것이 바람직하다고 판단된다.…”