THE EFFECT OF SMALL FLUCTUATION OF ATOMOSPHERIC PRESSURE AND TIDE TO DEVELOPMENT OF SEICHE AROUND KYUSHU COASTAL AREA

Abstract

 Exceptional long wave called ‘Abiki’ (it's a kind of meteotsunami or seich) has occurred around west coast on Kyushu Island from winter to spring season. Previous studies on Abiki showed initial amplification mechanism called Proudman resonance caused by low crest pressure waves, and secondary amplification mechanism caused by resonance between long wave and bay. However, the nonlinear relationships of tidal variation and Abiki has not been made clear so much. In this study, we tried some simulations of Abiki occurred on Feb., 2009, and basic analysis of interaction between tidal variation and development process of Abiki by using numerical model of nonlinear long wave equation.