Journal of Natural Disaster Science
Online ISSN : 2434-6705
Print ISSN : 0388-4090
Numerical Simulation of Storm Surges and Waves Caused by Typhoon Jebi in Osaka Bay with Consideration of Sudden Change of Wind Field
Kazuhiro TANAKAMasaki WASHIDAYoshihiro NISHIUKETetsuya HIRAISHI
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2020 Volume 40 Issue 2 Pages 44-68

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Abstract

Typhoon Jebi (T1821) was a high-speed typhoon with a moving speed exceeding 60 km/h at landfall, and with a further acceleration of the moving speed just before 14:00 on September 4, 2018, formed an extremely strong wind field, causing a storm surge and high wave disasters along the northern coast of Osaka Bay. This study conducted a numerical simulation of storm surges and waves using the wave-surge combined numerical model taking the effects of moving speed acceleration into consideration by enhancing the JMA GPV wind data. The computation successfully reproduced the disaster external forces in Kobe and Osaka Ports, Yodo River mouth, and Kansai International Airport. The major findings of the study are summarized as follows: (1) Numerical analysis considering the rapid increase of surface wind due to acceleration of the typhoon moving speed reproduced the storm surge anomaly exceeding 2.77 m observed at the northern end of Osaka Bay. (2) The storm surge water level in Yodo River exceeding O.P.+5.2 m was also reproduced. (3) The computed total water level was CDL+4.16 m (storm surge + wave run-up height + margin height) on the southeast side of Kansai International Airport Island that exceeded the current crown height of CDL+3.9 m.

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© 2020 by Japan Society for Natural Disaster Science
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