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http://dx.doi.org/10.3741/JKWRA.2014.47.3.297

Prediction of Salinity Changes for Seawater Inflow and Rainfall Runoff in Yongwon Channel  

Choo, Min Ho (Department of Environmental Engineering, Inje University)
Kim, Young Do (Department of Environmental Engineering, Inje University)
Jeong, Weon Mu (Korea Institute of Ocean Science & Technology)
Publication Information
Journal of Korea Water Resources Association / v.47, no.3, 2014 , pp. 297-306 More about this Journal
Abstract
In this study, EFDC (Environmental Fluid Dynamics Code) model was used to simulate the salinity distribution for sea water inflow and rainfall runoff. The flowrate was given to the boundary conditions, which can be calculated by areal-specific flowrate method from the measured flowrate of the representative outfall. The boundary condition of the water elevation can be obtained from the hourly tidal elevation. The flowrate from the outfall can be calculated using the condition of the 245 mm raifall. The simulation results showed that at Sites 1~2 and the Mangsan island (Site 4) the salinity becomes 0 ppt after the rainfall. However, the salinity is 30 ppt when there is no rainfall. Time series of the salinity changes were compared with the measured data from January 1 to December 31, 2010 at the four sites (Site 2~5) of Yongwon channel. Lower salinities are shown at the inner sites of Yongwon channel (Site 1~4) and the sites of Songjeong river (Site 7~8). The intensive investigation near the Mangsan island showed that the changes of salinity were 21.9~28.8 ppt after the rainfall of 17 mm and those of the salinity were 2.33~8.05 ppt after the cumulative rainfall of 160.5 mm. This means that the sea water circulation is blocked in Yongwon channel, and the salinity becomes lower rapidly after the heavy rain.
Keywords
sea water inflow; rainfall runoff; salinity; EFDC; outfall;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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