Graduate School of Science and Engineering（Engineering）
理工学専攻（環境建設工学）
日本語
Update date：2024/12/23
顔写真
Associate Professor
Kataoka Tomoya

Affiliation

  1. Ehime UniversityGraduate School of Science and Engineering Engineering for Production and EnvironmentAssociate Professor
  2. Ehime UniversityDepartment of Civil & Environmental Engineering, Graduate School of Science and EngineeringAssociate Professor
  3. Ehime UniversityGraduate School of Science and Engineering（Engineering） 生産環境工学専攻（環境建設工学）Associate Professor
  4. Ehime UniversityInstitute for Collaborative Relations Center for Disaster Management Informatics ResearchAssociate Professor
  5. Ehime UniversityInnovation Center for Sensing and Analysis of InfrastructureAssociate Professor
  6. Port and Airport Research InstituteVisiting Researcher
  7. Ehime UniversityAssociate Professor

Research History

  1. 2006/04-2007/03Chubu Regional Bureau, Ministry of Land, Infrastructure, Transport and Tourism名古屋港湾事務所
  2. 2007/04-2009/03National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and Tourism管理調整部 技術情報課
  3. 2009/04-2016/05National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, Transport and TourismCoastal Zone Systems Division, Coastal, Marine and Disaster Prevention DepartmentResearcher
  4. 2016/06-2020/12Tokyo University of ScienceDepartment of Civil Engineering, Faculty of Science and TechnologyAssistant Professor
  5. 2021/01-2024/09Ehime UniversityGraduate School of Science and Engineering Engineering for Production and EnvironmentAssociate Professor
  6. 2021/01-presentEhime UniversityCMESAssociate Professor
  7. 2023/03-presentORNIS技術顧問
  8. 2023/04-presentIndependent Administrative Institution Port and Airport Research Institute客員研究員
  9. 2024/04-present愛媛県環境創造センター客員研究員
  10. 2024/09-presentEhime UniversityDepartment of Civil & Environmental Engineering, Graduate School of Science and EngineeringAssociate Professor

Education

  1. University of Tokushima2002/04/012006/03/24graduated
  2. Toyohashi University of Technology2011/10/012014/03/24completed

Degree

  1. Dr. EngToyohashi University of Technology2014/03

Licenses and Qualifications

  1. 第二級陸上特殊無線技士2015/03

Research Areas

Research Interests

  1. Plastic Pollution
  2. Numerical modeling
  3. Ocean surface radar
  4. Image processing
  5. Artificial Intellignece

Subject of Research

  1. Study on plastic transport from land to the ocean2021/01/01This research aims to clarify plastic transport from land to the oceans, and contributes to the mitigation of plastic emission and prevention of plastic contamination in the oceans.
  2. Remote sensing for ocean waves2021/01/01This research is to develop a new technique for measuring ocean waves using high-frequency ocean radar systems and unmanned aerial vehicle.

Research Projects

  1. 国立研究開発法人科学技術振興機構研究成果展開事業（大学発新産業創出プログラム（START））プロジェクト推進型 SBIRフェーズ1支援短波海洋レーダシステムによる広域・高密度な波浪観測のための深層学習モデルの開発と実装2024/07-2025/03Principal investigator
  2. Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific ResearchEstimation of Small Microplastic Leakage from River Coverage using Land Surface ModelGrant-in-Aid for Scientific Research (B)2024/04-2027/03
  3. Environmental Restoration and Conservation Agency (ERCA)The Environment Research and Technology Development Fundonstruction of a comprehensive plastic litter observation system from the city to the coast using AI in conjunction with remote sensing2023/04-2026/03Principal investigator
  4. The Environmental Restoration and Conservation Agency of JapanThe Environment Research and Technology Development FundEvaluation of plastic transport from rivers and beaches2021/04-2026/03Principal investigator
  5. Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)Modeling of fragmentation and mobilization of plastic litter in river basinGrant-in-Aid for Scientific Research (B)2021/04-2024/03本研究は，流域圏における5mm未満のプラスチック微細片（S-MicP）の生成過程と流域圏から河川への流出過程を考慮した流域圏から河川へのS-MicP流出量推定モデルを開発することを目的としている．当該年度ではS-MicP生成過程のモデル化のため，流域圏に散乱する代表的なプラスチックゴミであるペットボトルラベルに着目し，紫外線促進劣化試験に基づく野外暴露時間の推定を行った．さらに，ペットボトルラベルに関してその力学特性及び化学特性を多角的に調べた． 紫外線（UV）促進劣化試験では，新品のペットボトルのラベルを準備し，UV照射装置を用いてプラスチックを光劣化させ，定期的に赤外顕微鏡（AIM-9000，株式会社島津製作所）でIRスペクトルを取得した．IRスペクトルのポリマーの化学構造がもつ波数帯と劣化由来によりIRスペクトルの変化が見られた波数帯の面積比により劣化インデックスを作成し，中須賀ポンプ場で採取した同一ラベルの屋外暴露時間を推定したところ，1日程度であることがわかった． 劣化特性に関する試験では，様々なメーカーのペットボトルラベルの新品を入手し，力学特性，化学特性，低分子量（添加剤）の抽出・分析を実施した．力学特性では，新品とごみ試料について引張試験を実施し，ごみ試料では力学特性に異方性が見られ，引張り途中で破断した．さらに，極大応力から破壊靭性を算出したところ，その値の大きさは，メーカーにより異なることがわかった．水の接触角を測定し，化学特性を調べたところ，新品試料表面は概ね疎水的である一方，ごみ試料の表面は親水的であることがわかった．また，TG測定を行ったところ，熱分解のしやすさがメーカーにより異なること，新品試料に比べごみ試料は熱物性が低下していることがわかった．また低分子量の溶媒抽出方法について検討し，抽出物の化学構造がメーカーによって異なることがわかった．
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Books and Other Publications

  1. 都市防災がわかる本防災リスク管理研究会pp.60-63彰国社2022/09/294395321828
  2. 理工系の基礎 土木工学土木工学編集委員会10.3（pp. 177-178）, 10.5（pp. 180-182）丸善出版2018/05
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Papers

  1. Instance segmentation models for detecting floating macroplastic debris from river surface images2024Tomoya Kataoka Takushi Yoshida Natsuki YamamotoFrontiers in Earth Science12Research paper (scientific journal)10.3389/feart.2024.1427132Quantifying the transport of floating macroplastic debris (FMPD) in waterways is essential for understanding the plastic emission from land. However, no robust tool has been developed to monitor FMPD. Here, to detect FMPD on river surfaces, we developed five instance segmentation models based on state-of-the-art You Only Look Once (YOLOv8) architecture using 7,356 training images collected via fixed-camera monitoring of seven rivers. Our models could detect FMPD using object detection and image segmentation approaches with accuracies similar to those of the pretrained YOLOv8 model. Our model performances were tested using 3,802 images generated from 107 frames obtained by a novel camera system embedded in an ultrasonic water level gauge (WLGCAM) installed in three rivers. Interestingly, the model with intermediate weight parameters most accurately detected FMPD, whereas the model with the most parameters exhibited poor performance due to overfitting. Additionally, we assessed the dependence of the detection performance on the ground sampling distance (GSD) and found that a smaller GSD for image segmentation approach and larger GSD for object detection approach are capable of accurately detecting FMPD. Based on the results from our study, more appropriate category selections need to be determined to improve the model performance and reduce the number of false positives. Our study can aid in the development of guidelines for monitoring FMPD and the establishment of an algorithm for quantifying the transport of FMPD.
  2. Geometric relationship between the projected surface area and mass of a plastic particle2024/09Tomoya Kataoka Yota Iga Rifqi Ahmad Baihaqi Hadiyanto Hadiyanto Yasuo NiheiWater ResearchResearch paper (scientific journal)10.1016/j.watres.2024.122061
  3. Comparison of concentration, shape, and polymer composition between microplastics and mesoplastics in Japanese river waters2024/02Yasuo Nihei Hiro Ota Mamoru Tanaka Tomoya Kataoka Jin KashiwadaWater ResearchResearch paper (scientific journal)10.1016/j.watres.2023.120979
  4. Applicability of ocean wave measurements based on high-frequency radar systems in an estuary region2024/01/02Tomoya Kataoka Takashi FujikiCoastal Engineering JournalResearch paper (scientific journal)10.1080/21664250.2023.2275469
  5. An analytical approach to confidence interval estimation of river microplastic sampling2023/10Mamoru Tanaka Tomoya Kataoka Yasuo NiheiEnvironmental PollutionResearch paper (scientific journal)10.1016/j.envpol.2023.122310
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Presentations

  1. Verification of spatiotemporal variation of ocean surface waves measured by high-frequency radar in Ise BayThe 4th ORCA
  2. Spatial distribution of microplastic concentrations in a cross-section of the Edo RiverECSA57
  3. Continuous Monitoring for floating-debris flux in rivers with image analysis technique38th IAHR World CongressOral presentation(general)
  4. Instance Segmentation Models for Detecting Floating Macroplastic Debris from River Surface ImagesAGU Fall Meeting2024/12/11Oral presentation(general)
  5. Temporal and Cross-Sectional Variations of Micro and Mesoplastic Concentrations in River Water: Case Studies from Urban Rivers Around Tokyo, JapanAGU Fall Meeting2024/12/11Oral presentation(general)
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Awards

  1. 2019/11Outstanding Presentation Award of the JSCE Annual Meeting 2019
  2. 2019/08Encouragement Award of The River Foundation 2019
  3. 2018/08Outstanding Contribution in Reviewing, Marine Pollution Bulletin
  4. 2016/02Encouragement Award of Japan Hydrographic Association 2016
  5. 2016/02Award of Japan Hydrographic Association 2016
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Allotted Class

  1. 2024HydraulicsⅠand Exercise
  2. 2024HydraulicsⅠand Exercise
  3. 2024HydraulicsⅡand Exercise
  4. 2024Maintenance Informatics for Civil Engineering Structures
  5. 2024Freshman Seminar A
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Social Activities

  1. せとうち「ゴミ箱になった海」再生化プロジェクト20222022/11/27-2022/11/27
  2. 愛媛県建設工事総合評価審査委員2022/09/20-2024/09/19
  3. 愛媛県ビーチクリーンスクール2022/09
  4. 環境省委託業務「令和4年度海洋ごみの実態把握及び効率的な回収に関する総合検討」2022/09-2023/03/10
  5. 環境省委託業務「令和4年度プラスチックごみの海洋への流出実態把握検討会」2022/05-2023/03/31
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Academic_Activities

  1. 土木学会水工学委員会オンラインWG 若手メンバーPlanning,management,etc.公益社団法人土木学会水工学委員会2020/06-2021/03
  2. 土木学会水工学委員会令和元年台風19号豪雨災害調査団 団員Planning/Implementing academic research公益社団法人土木学会2019/10-2020/12
  3. 土木学会海岸工学委員会2018年台風21号Jebi沿岸災害調査団 団員Planning/Implementing academic research公益社団法人土木学会海岸工学委員会2018/09-2019/03
  4. 土木学会水工学委員会西日本豪雨災害調査団 団員Planning/Implementing academic research土木学会水工学委員会2018/07-2019/03
  5. 公益社団法人 土木学会関西支部 比較沿岸環境工学に基づく今後の大阪湾研究に関する調査研究委員会 委員Planning,management,etc.公益社団法人土木学会関西支部2018/05-2019/03
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Professional Memberships

  1. 2021/01-presentInstitute of Electrical and Electronics Engineers
  2. 2020/06-present日本水環境学会
  3. 2019/11-presentAmerican Geophysical Union
  4. 2012/03-presentJAPAN SOCIETY OF CIVIL ENGINEERS
  5. 2010/07-presentTHE OCEANOGRAPHIC SOCIETY OF JAPAN
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Committee Memberships

  1. 2023/06-2025/05Japan Society of Civil EngineersSecretary of JSCE Shikoku branch
  2. 2023/04-2024/03環境省令和5年度海洋ごみの実態把握及び効率的な回収に関する総合検討業務 委員
  3. 2023/02-2025/01公益社団法人土木学会技術推進機構土木技術者資格委員会1級土木技術者資格小委員会
  4. 2022/09-2023/03環境省令和4年度海洋ごみの実態把握及び効率的な回収に関する総合検討業務 委員
  5. 2022/05-2023/03環境省令和4年度プラスチックごみの海洋への流出実態把握検討会 委員
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