SECONDARY UNDULATION OCCURRED IN KAGOSHIMA BAY DURING THE SUMMER SEASON

Abstract

 Characteristics of secondary undulation occurred in Kagoshima Bay during the summer season were examined using the results of observation and numerical simulation. It was clarified that the first-mode oscillation with the 24-minute period and the second mode with the 17-minute period are dominant in the southern and northern regions of the bay, respectively. The first mode has two nodal points at the central part of the southern region and off the bay, while the second mode has a nodal point at the central part of the northern region. Moreover, it was suggested that the two modes in summer occur according to the approach of a typhoon.