SPECTRAL CHARACTERISTICS OF WAVES GENERATED BY TYPHOON 1915 IN TOKYO BAY AND ENGINEERING ITEMS FOR MAINTENANCE OF NEARSHORE STRUCTURES

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  • 東京湾における台風1915号による波浪スペクトル特性と対策施設整備の留意点
  • トウキョウワン ニ オケル タイフウ 1915ゴウ ニ ヨル ハロウ スペクトル トクセイ ト タイサク シセツ セイビ ノ リュウイテン

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Abstract

<p> The East Japan Typhoon (Typhoon 1915), which crossed Tokyo Bay in September 2019 and caused extensive damages to port and coastal facilities in the bay, was a compact typhoon with a large pressure gradient near the center. In the ports of Yokohama and Chiba, there occurred many damages such as destruction of seawall parapets and inundation by high waves and wave overtopping . In particular, the directional spectra of the estimated waves off the port of Yokohama show two distinct peaks at almost same period but at different directions. As a result, the wave force was enhanced by the unusually large waves, which are thought to have caused the damages at Yokohama. It is assumed that the rise in average sea temperature in the Northwest Pacific Ocean will continue in the future, increasing the like-lihood of typhoons different from before, such as Typhoon 1915.In this study, we analyze the characteristics of the wave field in Tokyo Bay and the damages caused by Typhoon 1915, and point out engineering items necessary for the maintenance of port and coastal structures against the new type of typhoon that is likely to hit in the future.</p>

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