Development of an efficient model of coastal inundation based on reduction of coastal topography

• Project/Area Number: 18H01541
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 22040:Hydroengineering-related
• Research Institution: The University of Tokyo
• Principal Investigator: Takenori Shimozono 東京大学, 大学院工学系研究科(工学部), 准教授 (70452042)
• Co-Investigator(Kenkyū-buntansha): 山中 悠資 東京大学, 大学院工学系研究科(工学部), 助教 (60815108)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2021)
• Budget Amount: ¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000); Fiscal Year 2020: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
• Keywords: 浸水 / 予測 / モデル / 津波 / 高潮 / 浸水予測 / 氾濫 / 堤防

Outline of Final Research Achievements

The study develops a new model framework for coastal flooding by tsunamis and storm surges, which enables an efficient hazard assessment of numerous small coastal communities along a long stretch of coastline. The model represents　coastal low-lying areas as networks of their small subdomains and solve transfers of mass and momentum among the subdomains based on the linear shallow water equations. It is capable of simulating coastal flood processes with a smaller number of computational elements compared to conventional grid-based models. Model applications to past flood events confirmed that it achieves a good balance of accuracy and computational cost.

Academic Significance and Societal Importance of the Research Achievements

我が国では長い海岸線に点在する大小沿岸低地が津波や高潮の脅威に晒されており，人口減少による急速な社会変化も踏まえて広域レベルで沿岸防護のあり方を検討しなければならない．そのためには広域的なハザード評価をもとにした俯瞰的・相対的な議論を支える技術が重要となるが，既往の浸水予測手法の高い計算コストが大きな足枷となっている．本研究で開発した計算精度とコストのバランスした新しいモデルは，広域の海岸低地群を対象に一括した浸水予測を可能にし，様々なシナリオのもとで効率的なハザード評価を実現するものである．

Research Products

• [Journal Article] Water surge impingement onto a vertical wall: Laboratory experiments and stochastic analysis on impact pressure (2022)
  • Author(s): Xie, W., Shimozono, T.
  • Journal Title: Ocean Engineering Volume: 248 Pages: 110422-110422
  • DOI: 10.1016/j.oceaneng.2021.110422
  • Peer Reviewed
• [Journal Article] Tsunami inundation characteristics along the Japan Sea coastline: effect of dunes, breakwaters, and rivers. (2022)
  • Author(s): Yamanaka, Y., Shimozono, T.
  • Journal Title: Earth Planets Space Volume: 74 Issue: 1 Pages: 1-19
  • DOI: 10.1186/s40623-022-01579-5
  • Peer Reviewed / Open Access
• [Journal Article] Rapid assessment of tsunami source impacts on low-lying coastal areas using offshore wave superposition and static sweep of onshore terrain (2021)
  • Author(s): Yamanaka, Y., Shimozono, T.
  • Journal Title: Coastal Engineering Journal Volume: in print Issue: 2 Pages: 229-245
  • DOI: 10.1080/21664250.2021.2005364
  • Peer Reviewed
• [Journal Article] Tsunami propagation kernel and its applications (2021)
  • Author(s): Shimozono, T.
  • Journal Title: Natural Hazards and Earth System Sciences Volume: 21 Issue: 7 Pages: 2093-2108
  • DOI: 10.5194/nhess-21-2093-2021
  • Peer Reviewed / Open Access
• [Journal Article] A STATISTICAL STUDY OF THE DAMAGE CAUSES OF COASTAL FORESTS IN THE 2011 GREAT EAST JAPAN EARTHQUAKE TSUNAMI (2021)
  • Author(s): 林 隼佑, 下園 武範
  • Journal Title: Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) Volume: 77 Issue: 2 Pages: I_907-I_912
  • DOI: 10.2208/kaigan.77.2_I_907
  • NAID: 130008113423
  • ISSN: 1883-8944, 1884-2399
  • Peer Reviewed
• [Journal Article] Kernel representation of long-wave dynamics on a uniform slope (2020)
  • Author(s): Shimozono, T.
  • Journal Title: Proceedings of Royal Society A Volume: 476 Issue: 2241 Pages: 20200333-20200333
  • DOI: 10.1098/rspa.2020.0333
  • Peer Reviewed
• [Journal Article] Coastal impacts of super typhoon Hagibis on Greater Tokyo and Shizuoka areas, Japan (2020)
  • Author(s): Shimozono Takenori、Tajima Yoshimitsu、Kumagai Kenzou、Arikawa Taro、Oda Yukinobu、Shigihara Yoshinori、Mori Nobuhito、Suzuki Takayuki
  • Journal Title: Coastal Engineering Journal Volume: - Issue: 2 Pages: 1-17
  • DOI: 10.1080/21664250.2020.1744212
  • Peer Reviewed / Open Access
• [Journal Article] Frequency-dependent amplification of the Sanriku tsunamis in Ryori Bay (2019)
  • Author(s): Yamanaka, Yusuke., Miyuki Nakamura
  • Journal Title: Earth, Planets and Space Volume: 72 Issue: 1 Pages: 6-6
  • DOI: 10.1186/s40623-019-1128-1
  • Peer Reviewed
• [Presentation] 綾里湾における三陸沖地震津波の沿岸挙動に関する研究 (2019)
  • Author(s): 中村みゆき, 山中悠資
  • Organizer: 第66回海岸工学講演会
• [Presentation] Long wave propagation in convergent bays (2018)
  • Author(s): Takenori Shimozono
  • Organizer: South China Sea Tsunami Workshop
  • Int'l Joint Research