INVESTIGATION OF HIGH WAVE DAMAGE CAUSED BY 2019 TYPHOON FAXAI IN KANTO REGION AND WAVE HINDCAST IN TOKYO BAY

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  • 2019年9月台風15号による神奈川・千葉・茨城の高波被害および東京湾の波浪追算

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<p> This report summarizes our reconnaissance survey after Typhoon No. 15 (Faxai), which struck Tokyo Bay on September 9, 2019. In Kanagawa, there was no major damage on the Sagami Bay side, but on the Tokyo Bay side, overtopping over an upright revetment with a height of 3.3 m above the sea occurred. In Chiba, there was no conspicuous high wave damage, except a building in Kujukurihama Beach that was obviously struck by wave run-up and splash. On the other hand, wind disasters were severe, and damage occurred in various places, such as the scattering of building roofs and the collapse of power poles. Wave-damage in Ibaraki was also minor. In Ibaraki, the breakwaters should have been constructed against severe winter storms, and the embankments have been substantially upgraded after the 2011 Earthquake and Tsunami. These structural resilience may have contributed to limiting typhoon impacts. Based on our wave model verified by the observations at three stations inside/outside the bay, the peak wave height during the typhoon was estimated to be 3.4 m off the coast of Yokohama. Compared with other 16 major typhoons that landed in the Kanto region, this typhoon was characterized as a strong small typhoon that slowly moved through Tokyo Bay. The result of the wave hindcast suggests that wind waves were rapidly intensified within the bay, resulting in significant damage in particular coasts, exacerbated by a storm surge of up to 1 m.</p>

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