한국 새만금 방조제가 해양환경에 미치는 영향

Abstract

The Saemangeum dike on the mid-western coast of Korea, 33 km long will enclose a coastal zone of 40,100 ha this year. The dike construction changes greatly the coastal hydrodynamic system around the Saemangeum area. In particular, tidal currents in the near field of the dike are largely reduced, although the tidal range is slightly decreased. Riverain freshwater in the inner area flows out through two sluice gates (300 m and 240 m in width) after the dike construction. According to numerical study, the discharged water does not mix up quickly with its surrounding seawater under the reduced tidal mixing condition. Impact on the marine environment in the outer area by the discharge can be mitigated partially by controlling the discharge at the gates as well as opening time of the gates.