| Title |
Analysis of Hydraulic Characteristics of Yeongsan River and Estuary Using EFDC Model |
| Authors |
신창민 ( Chang Min Shin ) ; 김다래 ( Darae Kim ) ; 송용식 ( Yongsik Song ) |
| DOI |
https://doi.org/10.15681/KSWE.2019.35.6.580 |
| Keywords |
EFDC; EFDC-NIER; Estuary; Yeongsan River; Weir |
| Abstract |
The flow of the middle and downstream of the Yeongsan River is stagnant by two weirs of Seungchon and Juksan and the estuary dam and maintained in freshwater. In this study, the Environmental Fluid Dynamics Code-National Institute of Environment Research(EFDC-NIER) model was applied to the Yeongsan River to simulate water flow, temperature, and salinity stratification. The EFDC-NIER model is an improved model which can simulate multi-functional weirs operation, multiple algal species, and the vertical movement mechanism of algal based on the EFDC model. The simulation results for the water level, water temperature, velocity, and salinity reproduced the observed values well. The mean absolute error(MAE) of the model calibration in the annual variations of the water level was 0.1-0.3 m, water temperature was 0.8-1.7 ℃, velocity was 4.5-7.1 cm/sec, and salinity was 1.5 psu, respectively. In the case of scenario simulation for the full opening of the estuary dam, the water level of the estuary dam was directly impacted by the tide so it was predicted to rise-1.35 m to 0.2 m on average sea level. The velocity was also predicted to increase from 2.7 cm/sec to 50.8 cm/sec, and the flow rate to increase from 53 m3/sec to 5,322 m3/sec. |