HR: 0830h
AN: H21D-0879    [PDF]
TI: Modeling saltwater-freshwater interface within the river-mouth dyke
AU: * Park, Y
EM: parkyc@kangwon.ac.kr
AF: Dept of Geophysics, Kangwon National University, 192-2 Hyoja-dong, Chuncheon, 200-701 Korea, Republic of
AU: Kim, K
EM: kangjoo@kunsan.ac.kr
AF: Dept of Environmental Engineering, Kunsan National University, Miryong-Dong, Kunsan, 573-701 Korea, Republic of
AB: In Korea, many rivers are being or have been dyked at their mouths to obtain freshwaters for agricultural and industrial purposes in coastal areas. Seepage of seawater through the river-mouth dyke, which bisects the seawater and freshwater, may cause a serious salinization problem for the freshwater body formed inside of those dykes. However, the seawater seepage process through the dykes where two water bodies of different densities are in contact has been poorly understood. In this study, we employed a two-dimensional, flow and transport model to see how the two waters having the different densities interact within the river-mouth dykes by fluctuation of sea levels, and to evaluate the effect of density difference on the seepage of seawater into the fresh water body. Since the flow velocity in the dyke is strongly related to the safety of the dyke that was constructed of sandy materials, the changes in flow velocity field by the density differences were also assessed. To simulate the density-dependent flow within the dyke, two governing equations, one for fluid flow and the other for salt transport, were coupled into the model. The results of this study strongly suggest that, in this hydrologic system, both sea level fluctuation and the density differences have to be considered for a good estimation of seawater seepages through the dykes and velocity field of the flows within the dykes. The results show that the saltwater seepage and flow velocity field could be significantly changed under the hydrologic system of this study by the sea-level fluctuation and the density difference between the two waters are considered.
DE: 1829 Groundwater hydrology
DE: 1831 Groundwater quality
DE: 1832 Groundwater transport
SC: Hydrology [H]
MN: 2003 Fall Meeting