SHIBAYAMA, Tomoya

写真a

Affiliation

Faculty of Science and Engineering, School of Creative Science and Engineering

Job title

Professor

Homepage URL

http://www.f.waseda.jp/shibayama/index.html

Profile

Dr. Tomoya Shibayama is a Professor of Coastal Engineering at Department of Civil and Environmental Engineering of Waseda University in Tokyo, Japan. He is renown leaders in tsunami and storm surge disaster mitigation research in Japan. He uses hydraulic laboratory experiments, field surveys and numerical simulations to investigate tsunami effects on infrastructure and coastal communities. He served as team leader of survey teams for all major tsunami and storm surge events which occurred during the last decade. After the 2011 Tohoku tsunami, he established at Waseda University the Composed Crisis Research Institute and was appointed as its Director.

Concurrent Post 【 display / non-display

  • Faculty of Science and Engineering   Graduate School of Creative Science and Engineering

  • Affiliated organization   Global Education Center

Research Institute 【 display / non-display

  • 2020
    -
    2022

    理工学術院総合研究所   兼任研究員

Education 【 display / non-display

  •  
    -
    1979

    University of Tokyo   Graduate School, Division of Engineering   Civil Engineering  

  •  
    -
    1977

    University ot Tokyo   Faculty of Engineering   Department of Civil Engineering  

Degree 【 display / non-display

  • University of Tokyo   Doctor of Engineering

 

Research Areas 【 display / non-display

  • Hydroengineering

Research Interests 【 display / non-display

  • Coastal Disaster Prevention

  • Coastal Engineering

Papers 【 display / non-display

  • Engineering Lessons from September 28, 2018 Indonesian Tsunami: Scouring Mechanisms and Effects on Infrastructure

    Clemens Krautwald, Jacob Stolle, Ian Robertson, Hendra Achiari, Takahito Mikami, Ryota Nakamura, Tomoyuki Takabatake, Yuta Nishida, Tomoya Shibayama, Miguel Esteban, Nils Goseberg, Ioan Nistor

    Journal of Waterway, Port, Coastal and Ocean Engineering   147 ( 2 )  2021.03  [Refereed]

     View Summary

    The September 28, 2018 earthquake and tsunami, which occurred north of Palu City, Indonesia, attracted widespread interest from the scientific community due to the unusually large tsunami that occurred after a strike-slip earthquake with a relatively small moment magnitude (MW = 7.5). To understand the structural performance of buildings and infrastructure under hydrodynamic loads and their associated effects, the authors conducted field surveys in Palu City. Light wooden frame constructions and masonry infill walls were common in the area, some of which were severely damaged by the earthquake and tsunami. Reinforced concrete structures remained predominantly intact, although they suffered soil-related issues such as scour around rigid building members. Local structural failures caused by the loss of supporting soil were also observed during the field survey, resulting in an overall reduction in the stability of the inspected structures. Based on the observations made, knowledge gaps and research needs concerning coastal and structural scouring are discussed. These are tied into the latest community research activities and put in the context of a published ASCE standard chapter that discusses tsunami design.

    DOI

  • The mechanism of fluidization in mud beds under progressive waves

    Mohsen Soltanpour, Kourosh Hejazi, Mohammad Hadi Jabbari, Tomoya Shibayama, Shinsaku Nishizaki, Tomoyuki Takabatake

    Coastal Engineering Journal   63 ( 1 ) 32 - 51  2021  [Refereed]

     View Summary

    Wave-flume laboratory experiments were conducted to study the mechanism of fluidization of partially consolidated mud beds, under wave propagation. The mixture of commercial kaolinite and tap water was allowed to partially consolidate under its self-weight before initiating the progressive wave propagation. The vertical changes in pore water pressure in the mud bed were monitored by using sensitive pore pressure transducers, at three levels across the mud layer depth. The experiments revealed that the wave characteristics and bed properties strongly affect the complex fluidization process, in which the accumulated pore water pressure develops through four transitional stages. The accumulated pore water pressure increases sharply at the first stage, which is followed by further gradual increases in the next two stages, with different rates. The breakup of aggregated mud particles, i.e. the generation of fluid mud, is observed at the last stage, resulting in a partial dissipation of accumulated pore pressure and wave height attenuation. The measurements also revealed that the fluidization starts from the top of the mud layer, and proceeds to the underlying layers.

    DOI

  • Effect of translate speed of typhoon on wind waves

    Naoto Inagaki, Tomoya Shibayama, Miguel Esteban, Tomoyuki Takabatake

    Natural Hazards   105 ( 1 ) 841 - 858  2021.01  [Refereed]

     View Summary

    Quantitative assessments on the effect of translate speed of typhoons on wind waves were carried out.A WRF-SWAN coupled model that used observed meteorological data was applied to eight different typhoons in the vicinity of Shiono-Misaki, on the pacific side of Honshu Island, Japan. The authors proposed a new methodology to modify the translate speed and wind field of tropical cyclones using an empirical model in which the gross wind speed is expressed as the summation of two different types of wind generation. Two different trends of the relationship between the significant wave height (H ) and translate speed (V) were found, describing the most dominant parameter. Typhoons with a modest intensity and size (for the case of Japan) generally showed a positive correlation between the change in the maximum H and V, which means translation wind speed was the dominant parameter. In contrast, stronger typhoons were less sensitive to the change in V and could maintain high waves even when almost stationary. With reference to the results, it is important to raise awareness of the future problems that could be caused by large storms that stall for prolonged periods of time. s s

    DOI

  • Experimental and numerical investigation of tsunami behavior around two upright sea dikes with different heights

    Kotaro Iimura, Tomoya Shibayama, Tomoyuki Takabatake, Miguel Esteban

    Coastal Engineering Journal   63 ( 1 ) 1 - 16  2021  [Refereed]

     View Summary

    The 2011 Tohoku Tsunami caused severe damage to many coastal defenses along the Japanese coastline, including areas where two adjacent upright sea dikes of different heights met. There are many places along the coastline where structures of different heights and shapes meet due to the various design codes. In this study, the authors aim to examine the tsunami flow around such dikes by conducting three-dimensional hydraulic experiments in a tsunami wave basin and numerical simulations using the fluid dynamics model OpenFOAM. Twelve experimental cases were tested by changing the waveforms, and also by keeping the height of one side of the dike model constant while adjusting the dimensions of the other side. The results show that the difference in height between the structures significantly influences the volume of overtopping over the relatively lower dike and the inundation depth and velocity behind the dikes. Furthermore, different characteristics of inundation patterns are observed between the inundation depth and velocity. Hence, this study illustrates the necessity to re-assess the effectiveness of such structures against tsunami events.

    DOI

  • Influence of Edge Waves on Tsunami Characteristics along Kujukuri Beach, Japan

    Kentaro Koyano, Tomoyuki Takabatake, Miguel Esteban, Tomoya Shibayama

    Journal of Waterway, Port, Coastal and Ocean Engineering   147 ( 1 )  2021.01  [Refereed]

     View Summary

    The 2011 Tohoku Earthquake and Tsunami generated a massive tsunami that devastated Kujukuri Beach in Chiba Prefecture, Japan. The possibility that edge waves were involved in the propagation mechanism of the tsunami was investigated by using a numerical method. To detect the components of edge waves, the fluctuations of the simulated sea level, the variations of the power spectral and the phase, coherences, as well as the dispersed relations of the wavelength and the period, were analyzed. As a result, it was possible to conclude that there is a high probability that edge waves could have propagated around this coastline. In addition, to analyze the various types of edge waves that could be expected three additional earthquake scenarios were considered, each of them with a different magnitude and epicenter: The 1896 Sanriku Earthquake, the 1677 Empo Boso-oki Earthquake, and the 1703 Genroku Kanto Earthquake. This comparison indicates that there is a particular risk that edge waves can be generated by large earthquakes with their epicenter in the northern part of the Japan Trench.

    DOI

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Books and Other Publications 【 display / non-display

  • 海岸工学 -- よくわかる海岸と港湾

    ( Part: Edit)

    森北出版  2021.05

  • Hydraulics

    SHIBAYAMA, Tomoya( Part: Edit)

    Corona Publishing  2019.09

  • Handbook of Coastal Disaster Mitigation for Engineers and Planners

    Miguel Esteban, Hiroshi Takagi, Tomoya Shibayama( Part: Joint editor)

    Elsevier  2015.01 ISBN: 9780128010600

  • Japanese Coast

    Tomoya Shibayama, Hajime Kanyanne, Miguel Esteban( Part: Joint editor)

    2013.05 ISBN: 9784254160659

  • 3.11津波で何が起きたか

    柴山 知也

    早稲田大学出版部  2011.12 ISBN: 9784657113047

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Misc 【 display / non-display

  • A Investigation of Edge Waves Generated by Tsunamis on the Coastline of the Kujukuri Beach

    小谷野賢太朗, 高畠知行, 柴山知也

    海洋工学シンポジウム(CD-ROM)   28th  2020

    J-GLOBAL

  • Development of Deep-Learning Based Wave Prediction Model and Its Applicability to Japanese Coasts

    馬渡竜輝, 高畠知行, KYAW Thit Oo, 柴山知也, 澁谷容子, 小竹康夫

    海洋工学シンポジウム(CD-ROM)   28th  2020

    J-GLOBAL

  • Correction to: Street-scale storm surge load impact assessment using fine-resolution numerical modelling: a case study from Nemuro, Japan (Natural Hazards, (2019), 99, 1, (391-422), 10.1007/s11069-019-03746-6)

    Ryota Nakamura, Martin Mäll, Tomoya Shibayama

    Natural Hazards   99   423 - 424  2019.10

     View Summary

    © 2019, Springer Nature B.V. This correction stands to correct two discrepancies reported to the publisher soon after publication. The authors and publisher regret the errors as they were caused by a proofing oversight and stress the following to be noted: First, under the Methods and Material section (3.4), where the erroneous equation is:(Formula presented.).

    DOI

  • Study on the risks of tsunami inundation via underground pipelines

    T. Takabatake, T. Shibayama

    Proceedings of the 9th International Conference on APAC 2017   ( 213039 ) 268 - 279  2018

     View Summary

    When a tsunami comes to seaside industrial areas, seawater would enter landside areas through underground pipelines and induce inundation disasters. In the present study, the authors aim to investigate the risks of this tsunami inundation via the pipelines using the numerical simulation model. The results indicated that the influence of the tsunami inundation via the pipelines on seaside areas is not small and especially it will likely to influence the initial phase of evacuation. It is therefore important for port authorities and city planners to consider such risks when developing tsunami mitigation plans.

    DOI

  • Coastal flooding-induced debris motion

    Ioan Nistor, Nils Goseberg, Jacob Stolle, Tomoya Shibayama, Takahito Mikami

    Proceedings of the Coastal Engineering Conference   36  2018.01

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Awards 【 display / non-display

  • Hamaguchi Award

    2019.11   Minister of Land, Infrastructure and Transport   Research on Tsunamis and Storm Surges

    Winner: SHIBAYAMA, Tomoya

Research Projects 【 display / non-display

  • Co-operative Research with Canada on Coastal Disaster Study in Artic Sea

    Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

    Project Year :

    2020.10
    -
    2026.03
     

  • 令和元年台風15号による停電の長期化に伴う影響と風水害に関する総合調査

    特別研究促進費

    Project Year :

    2019.10
    -
    2021.03
     

    丸山 喜久, 能島 暢呂, 庄司 学, 永田 茂, 宮島 昌克, 大庭 哲治, 梶谷 義雄, 佐藤 翔輔, 筆保 弘徳, 小林 文明, 竹見 哲也, 飯塚 聡, 宮本 佳明, 益子 渉, 丸山 敬, 松井 正宏, ガヴァンスキ 江梨, 野田 稔, 中嶋 唯貴, 西嶋 一欽, CRUZ Ana・Maria, 高橋 徹, 友清 衣利子, 劉 ウェン, 有川 太郎, 柴山 知也, 高木 泰士, 平石 哲也, 清野 聡子, 田中 規夫, 八木澤 順治, 竹林 幹雄, 大西 正光, 畑山 満則, 平田 輝満, 轟 朝幸, 大石 哲

     View Summary

    令和元年台風15号(房総半島台風)が主として千葉県で引き起こした長期間に渡る停電と風水害の総合調査を行った.本研究は,ライフライン,気象,風工学,海岸・港湾,水工学,交通の6分野で構成される.ライフライン分野では,ライフライン被害・復旧の概要と災害間比較,ライフライン停止による生活支障の実態調査などを行った.近年の自然災害の中でも台風15号による停電は復旧進捗の遅さは群を抜いており,かなり特異な傾向を示していることがわかった.気象分野では,台風15号の発生・発達環境場の概要調査,数値シミュレーションによる台風上陸前の強度・構造変化メカニズムの解明などを行った.令和元年台風15号は,発生期から発達期前半までは顕著に発達しなかったが,その後発達期を迎えて台風急速発達が起きたことがわかった.さらに,成熟期から衰弱期では,衰弱過程が弱くなる環境場であった.風工学分野では,現地調査による構造物の強風被害状況の把握,UAV空撮画像による屋根被害の検出などを行った.千葉県鋸南町,南房総市および館山市の一部地域で行われた現地被害調査では,何らかの被害を受けた住宅の被害率は約60%であった.海岸・港湾分野では,横浜市および南房総における高潮・高波の調査,船舶漂流挙動の予測と対策などを行った.神奈川県では,明らかな高波被害が東京湾に面した横浜市中区や金沢区の港湾区域で確認された.水工学分野では,降雨特性,流域特性からみた浸水メカニズムの比較と住民避難状況の調査を行った.調査結果に基づいて,千葉県で浸水が生じた河川に対して,実際の浸水形態を広域かつ簡易に説明できるような判定図を作成した.交通分野では,成田空港における利用者滞留問題の調査,航空貨物輸送への影響評価などを行い,空港アクセス交通機関で何が起こったのかをとりまとめた.

  • A Study On Beach Transformation Due To Irregular Waves

  • 波による軟らかい底質粘土の輸送機構

    一般研究(C)

  • 堆積底泥の波による再浮遊機構に関する研究

    環境科学特別研究

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Specific Research 【 display / non-display

  •  陸上に氾濫する津波の三次元的挙動解明と減災への応用

    2018   石井秀憲, 高畠知行, Miguel Esteban

     View Summary

     陸上に氾濫した津波では周辺に存在する構造物の遮蔽効果を用いれば、波力を低減できる。水理実験では、津波水槽内で角柱構造物周辺の流速場をPIVを用いて計測し、流速・渦度の時間的・空間的変化を計測した。汀線と平行方向に構造物を配置した場合、浸水深は角柱間の距離に依存して変化し、運動量流束が角柱を設置しない場合と比較して40~140%程度変化した。この他にもいくつか配置を検討し、構造物の配置により運動量流束の最大値が10~140%変化することが解った。 また、乱流モデル(DES)を用いた3次元数値計算により、流速場及び浸水深を再現し、運動量流束の低減効果の高い配置パターンを提示した。この結果は、構造物配置を設計する上で有用である。

  • 首都圏での噴火による火山灰降下分布予測と対策の立案

    2015   大島 優, 山口秀明, 奥村 暖, 田野倉祐介, 菅原 奈津子, 三上貴仁

     View Summary

     メソスケール化学輸送モデルを用いて噴火後迅速に火山灰の降灰範囲を予測し、速報型の予測手法を提案した。噴火後24時間以内に必要な情報を収集し、噴火の翌日から数値計算を行うことで数日間の降灰範囲の予測を行う場合を想定し、これを速報型の予測手法と定義した。この手法を用いて噴火後の降灰範囲を予測することで、全国の自治体に所属する土木技術者が迅速に降灰への対策を講じることが可能となる。具体的にはメソスケール気象予測モデルWRF(Weather Research and Forecasting)と大気化学プロセスが組み込まれたメソスケール領域気象・化学輸送モデルWRF-Chem (Weather Research and Forecasting and Chemistry)を用いている。

  • 沿岸域の高潮・津波災害脆弱性の分析

    2009  

     View Summary

     アジア、アフリカの対象地域に対して既に筆者が構築した広範なネットワークを利用して、具体的な海外現地調査データの集積を行い、各地域の特性を把握し、その結果を基に総合的な防災、環境モニタリングのシステムを検討した。まず、2009年9月初旬に大隈小講堂において「アジアとアフリカにおける沿岸域の防災・環境・管理に関する研究集会」を開催し、ベトナム、インドネシア、タイ、スリランカ、タンザニア、イギリス、日本、カナダなど各国の研究者が沿岸域の防災、環境、マネジメントなどに関するそれぞれの国での最新の研究状況、研究成果について発表した。参加者は途上国や欧米の大学で教鞭をとる研究者たちで、本研究集会の成果により新しい沿岸域研究プロジェクトを開始することを決定した。 また、2009年9月中旬には、上記の研究集会参加所の協力を得て、ベトナムでの現地調査を実施した。その結果、環境変動に伴う高潮・高波被害の変化、高潮・高波対策、および土壌の浸食対策については、海外調査の結果による情報を解析し、環境変動あるいは流域内の浸食量を推定する方法をシステム化するための資料を得た。 一方、2009年9月29日に発生したサモア諸島沖地震津波により,サモア独立国と米領サモアの沿岸部は大きな被害を受けた.本研究では,現地調査と数値計算を実施することにより両国での津波被災の特徴を明らかにした。地震発生から約1カ月後の2009年10月28日から11月1日にかけて,サモア独立国・ウポル島および米領サモア・トゥトゥイラ島の2島において津波痕跡高の測量と被災住民への聞き取り調査を実施した.サモア諸島沿岸には地震発生後20分程度で第一波が襲来し,高さは最大で9m に及び,広い範囲で甚大な被害をもたらした.サモア諸島は島を取り囲むサンゴ礁のリーフの幅が広く,これらのリーフ上で波が砕けながら進んでくる様子がはっきりと見え,沿岸部の住民はいち早く危険に気付き逃げることができた.いくつかの村では津波の挙動を教える教育を実施しており,津波の危険を感じたら安全な場所へ避難するという意識が住民の中に備わっていた.サモア社会の特徴として地域社会の構造が極めて強固であり,酋長であるマタイの権限が強いことが挙げられる.住み慣れた沿岸の居住地を離れ高地への移転を決断した村では,このマタイのリーダーシップというサモア社会の特徴がうまく機能していたと考えられる. 

 

Syllabus 【 display / non-display

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