Development of tsunami disaster mitigation technology using oceanographic radar - exploring devastated area and speeding up warning cancellation -

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K21085
• Project/Area Number (Other): 18H05914 (2018)
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund (2019); Single-year Grants (2018)
• Review Section: 0303:Civil engineering, social systems engineering, safety engineering, disaster prevention engineering, and related fields
• Research Institution: Tohoku University
• Principal Investigator: Seto Shuji 東北大学, 災害科学国際研究所, 助教 (80819673)
• Project Period (FY): 2018-08-24 – 2021-03-31
• Keywords: 海洋レーダ / 津波波峰推定 / 南海トラフ地震津波 / 特性化波源モデル / 不均一すべり分布 / 津波観測情報

Outline of Final Research Achievements

In order to improve the reliability of tsunami warnings and to develop techniques to search for severely affected areas, it is important to improve the tsunami observation system. In this study, a method to estimate tsunami wave peaks using oceanographic radar, which is expected to be a new tsunami observation technology, was investigated. Its accuracy was verified for the Nankai Trough giant earthquake tsunami. The accuracy of the method was verified for the Nankai Trough earthquake tsunami. Tsunami propagation calculations were carried out using the initial conditions of Mw 9.1 and 8.6 tsunami sources in the Nankai Trough. As a result, the position of the wave peaks was estimated well, and the water level of the wave peaks was estimated with an error range of -20 to 10%.

Free Research Field

津波防災

Academic Significance and Societal Importance of the Research Achievements

東日本大震災において，日本や米国の沿岸に設置された海洋レーダによる津波の観測に初めて成功し，海洋レーダによる津波検知の可能性が実証された．これを受け，国内外でも津波を観測対象とした海洋レーダの研究が実施されているが，津波流速の観測や津波伝搬の検知が中心であった．これらの背景を踏まえ，本研究は，1局の海洋レーダで津波波峰推定を試みたものであり，その学術的意義は高いと考えられる．また，今回の検討手法により，来襲する津波波峰の位置をリアルタイムに推定できることから，避難行動や発災後の救助活動など津波防災実務への貢献も期待される．