한국 동해 연안용승역에서 해수유동 수치실험

Abstract

This paper was focused on studying the flow characteristics in time and space at upwelling region using a three-dimensional hydrodynamic model, Prinston Ocean Model, in the East Sea of Korea after determining the optical environment factors of upwelling occurrence. In order to estimate the amount of nutrients and primary production being transported from lower level to upper level, the flux of upwelling was quantitatively estimated. The results of hydrodynamic model showed that the flow was southward during flood tides and northward during ebb tides. Generally, tidal currents were getting weaker as moving to north from south. To test upwelling effect, wind-driven currents were experimented in classifying three cases of wind directions, southwesterly, southerly and westerly. Each case of wind directions was simulated by three different wind speeds, 3m/s, 6m/s and 9m/s. The result showed that the strongest upwelling occurred when wind blows southwesterly. Upwelling begin to occur at wind speed 6m/s in southwesterly and southerly wind and 9m/s in westerly wind. The results of upwelling flux for five stations where upwelling was dominantly occurred were compared. Residual current was 57.28(105×m3/day) in maximum at St. Ⅱ by the influence of strong current and bottom topography. Wind-driven current was 50.84(105×m3/day) in maximum at St. Ⅲ. It is concluded that Tsusima Currents influenced largely for upwelling occurrence at St. Ⅰ,Ⅱin the meantime, wind-driven currents affected dominantly for upwelling occurrence at St. Ⅲ∼Ⅴ. The results of sea surface temperature produced by hydrodynamic numerical experiments were well agreed with sea surface temperature images by National Oceanic and Atmospheric Administration when strong upwelling occurred.