An Improvement of model performance in according high resolution in the Coastal area

Abstract

The current systems in the south coast of Korea are complex and relatively strong due to combination of geological features and tidal effects. Even though it is not a very wide area, the flow patterns of eastern side and the western side are quite different. In the west part of the south coast of Korea where has strong tidal currents, the current speed of which is more than 3 m/s during spring tides, on the other hand, the southeast coast has relatively weak tidal current but Tsushima Current, a branch of the Kuroshio and flowing northeastward, affects constantly. So, it is very difficult to predict the currents in the south coast of Korea.Korea Institute of Ocean Science and Technology (KIOST) has been conducting the KOOS (Korea Operational Oceanographic System) project since 2009, including a three-dimensional circulation prediction system that calculates tidal and oceanic effects around the Korean peninsula. This project has consistently studied the improvement of coastal model accuracy, and has considered the criteria resolution for the prediction system. For the precise model predictions which are essential to reduce coastal disasters such as oil spill, search and rescue, storm surge and so on, the high-resolution grid would be better if other conditions are the same. However, the higher grids require more computational resources and time. An appropriate grid size is therefore needed to allow for both accuracye quite different. In the west part of the south coast of Korea where has strong tidal currents, the current speed of which is more than 3 m/s during spring tides, on the other hand, the southeast coast has relatively weak tidal current but Tsushima Current, a branch of the Kuroshio and flowing northeastward, affects constantly. So, it is very difficult to predict the currents in the south coast of Korea.Korea Institute of Ocean Science and Technology (KIOST) has been conducting the KOOS (Korea Operational Oceanographic System) project since 2009, including a three-dimensional circulation prediction system that calculates tidal and oceanic effects around the Korean peninsula. This project has consistently studied the improvement of coastal model accuracy, and has considered the criteria resolution for the prediction system. For the precise model predictions which are essential to reduce coastal disasters such as oil spill, search and rescue, storm surge and so on, the high-resolution grid would be better if other conditions are the same. However, the higher grids require more computational resources and time. An appropriate grid size is therefore needed to allow for both accuracy