Abstract
Meteorologically generated large secondary oscillation along coasts of Kyushu has been explained into two stages; long ocean waves induced by air pressure disturbance are amplified by air-sea interactive resonance when both moving speeds nearly coincide, and the arrived long waves are amplified by the geometric resonance with the eigen frequency of the bay or harbor. The area of west Kyushu coasts facing the East China Sea has suffered the seiche disasters locally called “Abiki”. Recently, the same type disasters have been reported from the countries along the Mediterranean, Adriatic and North Sea, etc. The term “Meteotsunami” has become widely recognized and the importance of the subject is increasingly appreciated. We have studied the meteotsunami events at Urauchi Bay in Kamikoshiki Islands, Kagoshima by seasonal field observations in 2010 and 2012. For obtained meteotsunami events, we have numerically analyzed the atmospheric fields over the East China Sea and southeastern China mountains, as well as the oceanic fields from the offshore to the coastal areas. The present study aims to correlate the findings obtained by our field observations and numerical simulations, and to clarify a series of mechanism from the generation of the air pressure disturbance, and its development, resonance with ocean long waves, and amplification in the bay of the arriving long waves.
