In this study, the causes of the meteo-tsunami induced by high pressure system in winter season on Yellow sea were analyzed and optimum simulation methods were examined.
First of all, the tidal observation data provided by KHOA (Korea hydrographic and oceanographic administration) were analyzed by using the high passed filter and wavelet methods to choice the meteo-tsunami event day during winter season in 2005. After that, synoptic weather analysis was performed with various synoptic weather charts provided by KMA (Korea meteorological administration) on the meteo-tsunami event days caused by high pressure system in 2005 winter season. Consequently, the event day was chosen as 21th December 2005.
An atmospheric structure during the meteo-tsunami day was analyzed to cause of abnormal amplitude by using the WRF model. The meteo-tsunami was likely to occur when a dynamic instability was propagated by the expansion and contraction of the Siberian high.
As WRF model’s results (e.g. surface wind vector (WS), sea level pressure (SLP)) were used as ROMS model’s input, three experiments were established for the sensitivity test as the number of the ROMS model’s input. Experiments were composed with different combinations of SLP and WS (EXP1), only SLP (EXP2) and WS without SLP (EXP3) to ROMS model''s forcing. Compared to the EXP2, EXP1 and EXP3 presented the high prediction accuracy statistically. The temporal and spatial distribution of high-passed sea level simulated by EXP1 and EXP3 showed that wave of high amplitude propagated to coast of Korea, but EXP2 did not. Compared to EXP1, the difference between EXP1 and EXP2 presented that SLP would have little impact to the wave amplification. However, compared to EXP1, the difference between EXP1 and EXP3 showed that WS would have great contribution. Therefore, following this numerical study, WS considered to have a significant role in winter season case occurred by high pressure system.
In this study, the results were the possibility for forecasting meteo-tsunami occurred by high pressure system on Yellow sea, so it might be contributed to reduce the coastal accidence from the meteo-tsunami.