The Storm Surge Induced by Typhoon 9918 in the Yatsushiro Sea, Japan: A Comparison of Typhoon 9918 with Typhoon 9119.

概要

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Although the paths and scales of typhoons T9119 and T9918 were similar, a severe storm surge was excited in the Yatsushiro Sea only by T9918. In order to examine the reasons for this, numerical experiments on the storm surges caused by T9119 and T9918 are performed. Results of the numerical experiments reveal that tidal anomalies induced by the wind and by depression of the sea surface pressure of T9918 were larger than those of T9119. An analysis of the meteorological data shows that the wind speed of T9918 was locally greater than that of T9119. It is suggested that the locally strong wind of T9918 caused the large tidal anomaly. The contribution of the sea surface pressure of T9918 to the storm surge was greater than that of T9119. The results of the numerical experiments show that the volume transport induced by T9918 toward the head was greater than that by 9119, since the pressure gradient of T9918 along the bay axis was stronger than that of T9119. It is indicated that the large volume transport induced by T9918 caused the large tidal anomaly at the head compared with that by T9119.
日本海洋学会の論文