SECONDARY UNDULATION FORECAST IN THE WESTERN REGION OF KYUSHU USING SEA LEVEL DATA AT MESHIMA ISLAND

Abstract

 Amplification factor of secondary undulations in western region of Kyushu was examined using sea leval data at five tidal stations during February 10 - March 31 in 2012. As a result, it was shown that the heights of shallow water waves at Fukue, Nagasaki, Koshiki Island and Makurazaki are amplified by factors of about 2.0, 6.6, 7.6, 7.0, respectively. Moreover, it was suggested that sea level variation with periods less than one hour at Meshima Island is a good index to forecast the large secondary undulation west of Kyushu.