생태-유체역학 모델링에 의한 낙동강하구해역의 물질수지 산정

Estimation of materal fluxes by eco-hydrodynamic modeling in the Nakdong river estaury

The Nakdong river estuary was eutrophicated and frequently outbreak of red tide by pollutants inputed from the effluent of which sewage disposal plant and the Nakdong river. This study is performed to countermeasures for these problems, Firstly, water and COD fluxes are estimated in case of both river discharge is considered and ignored. The residual current and salinity front are simulated by the three dimentional hydrodynamic model, and also residence time of water, COD are calculated. The salinity front is apparently formed and low salinity water dispersed to open sea if consider of the Nakdong river discharge. Seawater exchange flux by residual current is very fluctuated according to the Nakdong river discharge. When consider of the Nakdong river discharge, the output flux of COD is more than input flux, and residence time of that is very shortened. It is suggested that concentration of COD in study area is very high contrast to input loads, because of autochthonous COD by nutrient uptake of phytoplankton is increased. Therefore, adequate reduction of input loads of COD, DIN, and DIP by study the response of water quality is necessary.