EFFECT OF LARGE TIDAL VARIATION ON STORM SURGE IN THE WESTERN COAST OF KOREA

摘要

Parallelized Nesting Tide, Surge and Wave Couplling (PAN-TSWC) model was developed to estimate storm surges and waves caused by typhoons. For the high resolution of complex topography, the nesting scheme was employed and parallelized. With a model typhoon having the same magnitude with Typhoon Maemi, the numerical experiments were conducted to investigate effects of the large tidal variation on the storm surge, wave set-up and total water level by changing tidal amplitudes and tidal phases when the maximum storm surge occurs. It was found that the magnitude of storm surge was significantly affected by the large tidal variation which generally made it small compared with that calculated without the tidal variation;especially, the higher tidal level was, the smaller the storm surge was. The wave set-up was also influenced by the large tidal variation. The wave set-up computed by imposing the tide tended to be decreased compared to that calculated without the tide, when the tidal amplitude became larger.Even though the magnitude of storm surge by the coupling run became smaller depending on the tidal phases and the tidal amplitude compared to that by the non-coupling run, the water level became the maximum at the flood tide phase.