Abstract
Secondary undulation during the summer season is caused by typyoons. Therefore, in harbors and the like, sea level rises dut to overlapping secondary undulation on storm surges and risk of causing disasters such as flooding becomes high. Also, as this secondary undulation may become the maximum deviation after storm surge, it is important to know its characteristics. In this study, we perfomed numerical simulation at the Kominato fishing port of Amami Oshima Island where typoon frequently invasion, and attempted to reproduce secondary undulation that caused by typhoon passage June 18 to 20, 2012. As a result, secondary unduration that occurred after June 19, although qualitative, also appeared in the calculation results. From this result, we clarified the mode characteristics of the period of 6 minutes and the propagation characteristics of the ocean long wave, which is the cause of the secondary unduration.
