2020 Volume 76 Issue 2 Pages I_43-I_48
In this study, we investigated the occurrence characteristics of the swell along the Pacific coast using the NOWPHAS wave observation data, and discussed the improvement of the swell estimation accuracy by verifying the accuracy of waves hindcasted for a case of Typhoon LAN(1721). As a result of analyzing the observation data using partitioning, it was confirmed that swell as well as multimodal waves occurred frequently on the eastern Pacific coast, and various swell overlapped are rushing to the coast. The hindcasted data for Typhoon LAN(1721) showed that the long period swell peculiar to Kashima Port were generated due to the influence of the seabed topography off Inubozaki. In addition, in order to improve the estimation accuracy, the effects of the nonlinear interaction terms and the number of directional divisions on the estimation accuracy were investigated. It was found that when GMD was used for the nonlinear interaction term, the overestimation of swell was slightly improved. It is expected that such comparative verification of each swell component will lead to improvement of swell estimation accuracy.
