INVESTIGATION OF STORM WAVES CAUSED BY TYPHOON 9918 WITH WAVE HINDCASTING METHODS, WAM AND MRI

In this paper, we investigated the severe sea condition around the Kyusyu-Yamaguchi area caused by the typhoon 9918 by using the wave hindcasting method. At the beginning of the investigation, the wind field was simulated by using the typhoon model (Myers' model) with appropriate parameters. Especially, the wind field on the Sea of Suou surrounded by the lands was carefully examined with the measured wind data, and was corrected in consideration of the influence of the lands. Based on the simulated wind field data, we simulated the sea conditions by using the third generation wave hindcasting model, WAM. As a results of the simulations, some characteristics of the sea conditions caused by the typhoon was clarified. In addition, we also simulated the sea conditions by using the first generation wave hindcasting model, MRI. This paper discussed the accuracy and applicability of the WAM and MRI models based on the observed records such as wave heights and periods as well as the directional wave spectra.