Hinata Hirofumi

Update date：2024/12/20

Professor

Hinata Hirofumi

My website is here.

Research History

1991/04-1995/07株式会社　熊谷組
1991/04-1995/07株式会社熊谷組
1995-2000Tokyo Institute of TechnologySchool of Engineering
2000-2001運輸省港湾技術研究所主任研究官
2001-2007National Institute for Land and Infrastructure Management
2007-2014/03国土交通省国土技術政策総合研究所室長
2014/04-2023/03Ehime UniversityGraduate School of Science and Engineering, Engineering for Production and Environment教授
2014/04-present愛媛大学先端研究・学術推進機構沿岸環境科学研究センター環境動態部門
2020/04-presentEhime UniversityInstitution for Collaborative Relations Center for Disaster Management Informatics Research
2023/04-2023/12愛媛大学大学院理工学研究科理工学専攻環境建設工学講座
2023/09-presentEhime University南予水産研究センター
2023/12-presentEhime University防災情報研究センター海洋レーダ情報高度化寄附研究部門教授（兼任）
2023/12-presentEhime University南予水産研究センター教授（兼任）
2023/12-presentEhime University海洋レーダ情報高度化寄附研究部門教授（兼任）

Education

Tokyo Institute of Technology
Tokyo Institute of Technology

Degree

博士（工学）東京工業大学
閉鎖性および開放性沿岸域の流動・物質輸送に与える外洋影響の解明東京工業大学

Research Areas

Research Interests

microplastics
tsunami
Marine debris
chaotic advection
Kuroshio
HF oceanic radar
wind-driven current
海洋ゴミ
吹送流
黒潮
東京湾
東シナ海
HFレーダ

Subject of Research

海洋プラスチックの動態解明に関する研究2014/04-present
津波レーダの開発に関する研究2014/04-present

Research Projects

新エネルギー・産業技術総合開発機構(NEDO)ムーンショット型研究開発事業非可食性バイオマスを原料とした海洋分解可能なマルチロック型バイオポリマーの研究開発2022-2023/02
Japan Society for the Promotion of ScienceGrants-in-Aid for Scientific ResearchComprehensive studies on the circulation of ocean plastics including very small microplasticsGrant-in-Aid for Scientific Research (S)2021/07-2026/03
環境省環境研究総合推進費プラスチックの持続可能な資源循環と海洋流出制御に向けたシステム構築に関する総合的研究2021-2025
日本学術振興会科学研究費助成事業国際共同研究加速基金(国際共同研究強化(B))インドネシアにおける仮想津波観測実験―海洋レーダ津波防災活用技術の飛躍的発展国際共同研究加速基金(国際共同研究強化(B))2020/10-2024/03地震波解析に基づく津波警報第１報は，巨大地震津波などに対し過小になる可能性が高い．津波による人的被害を減らすには，沖合での津波計測が極めて重要である．海洋レーダは，陸棚縁から港湾域まで津波をシームレスに計測する能力を有する．本研究では，１）電波環境計測や津波シミュレーションから津波検知性能を評価するモデルの開発，２）レーダ津波検知性能向上のためのノイズフィルと３）レーダによる津波情報を活用した住民避難モデルの開発を目指している．以上を日本とは電波環境，人間行動特性の大きく異なるインドネシアで行い，日本で培ってきた海洋レーダの津波防災活用範囲の拡充を目指す． 2020年度の主な研究概要は以下の通りである．１）2019年に日本政府によりジャワ島南岸に2局の海洋レーダが設置された．そこで，ジャワ島南岸沖で津波発生シナリオを設定し，2局のレーダによる仮想的な津波流速観測結果から，最適内挿法を応用したデータ同化手法によりジャワ島南岸でのリアルタイム津波波高予測を実施した．予測精度に対するレーダによる流速観測点数・位置や予測対象地点位置の依存性について検討を進めている．２）我が国における既存データを利用し，到来方向特定の困難なノイズに対しハンペル識別子によるノイズフィルタを適用しノイズ軽減に対する効果を確認した．また，来年度以降の現地調査に向けて，観測機材の整備を進めた．３）現地調査が困難であったため，2018年9月のパル津波地震を対象に，プロトタイプ避難モデルを開発を行っている．
Ehime Universityインドネシアにおける仮想津波観測実験―海洋レーダ津波防災活用技術の飛躍的発展Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))2020/10/27-2024/03/27Principal investigator本研究では，レーダを設置せずに電波環境計測と津波シミュレーションのみから津波検知性能を評価するモデルを，ディープラーニングを使って開発する．さらに，レーダ津波検知性能向上のためのノイズフィルとレーダによる津波情報を活用した住民避難モデルを開発する．以上を日本とは電波環境，人間行動特性の大きく異なるインドネシアで行い，海洋レーダの津波防災活用範囲を格段に広げる技術を開発する．

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Books and Other Publications

Modelin and Analysis of Marine Environmental Problems, ed. By K. Omori, X. Guo, N. Yoshie, N. Fujii, I.C. Handoh, A. Isobe, and S. TanabeTerrapub2011
The Environment in Asia Pacific Harbours, ed. By Eric WolanskiSpringer2006

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Papers

An estimation of the abundance of plastic litter generated by beach users nationwide in Japan2025/01Hirofumi Hinata Ryusei Hamamoto Ku Tachibana Naoki Yamaguchi Kouko Furukawa Kenki KasamoMarine Pollution Bulletin210, 117293-117293Research paper (scientific journal)10.1016/j.marpolbul.2024.117293Elsevier BV
Tsunami Data Assimilation Using High‐Frequency Radar‐Derived Surface Currents by Considering Beam Angle‐Dependent Measurement Error Distributions2024/10/02Muhammad Irham Sahana Ryotaro Fuji Tomoyuki Takahashi Hirofumi HinataEarth and Space Science11/ 10Research paper (scientific journal)10.1029/2024ea003561URLAmerican Geophysical Union (AGU)Abstract The application of high‐frequency radar as an instrument for assimilating tsunami‐induced current fields is garnering increasing interest. The performance of surface current velocity measurements depends on the azimuthal differences between the crossing radar beams at the measurement points. This study aimed to incorporate the measurement error distributions of the east‐west and north‐south velocity components into tsunami data assimilation based on an optimal interpolation method, assuming Gaussian noise with the time‐invariant and a uniform standard deviation (STD = 5 cm/s) of radial velocity measurements. Through the empirical orthogonal function (EOF) analysis of radar‐derived surface currents in the Kii Channel, Japan, the velocities reconstructed using higher modes (EOFs 16–274) were associated with measurement errors, portraying nonuniform distribution depending on the crossing beam angle of two radar beams. Based on independent fifteen‐time assimilation experiments for two different tsunami scenarios, for a uniform water depth of 500 m, we observed a significant improvement of up to 29% and 0.9% in the assimilation performance (on average) over the along‐coast stations for scenarios with 1‐ and 5‐m maximum initial sea surface heights, respectively. The measurement errors dependent on the crossing beam angle reduced the error‐induced tsunamis, resulting in stable assimilations, with lower STDs in the fifteen‐time assimilation performances. When the STD of Gaussian noise varies with time, it is important to consider the temporal change in the radial velocity measurement errors and/or noise‐filtering techniques, to maintain a certain level of noise intensity.
Extended Abstract 別府湾におけるマイクロプラスチック堆積速度 : 75年間の変遷2023/08日向博文沿岸海洋研究 = Bulletin on coastal oceanography61/ 1, 103-105URL日本海洋学会沿岸海洋研究部会
Beppu Bay, Japan, as a candidate Global boundary Stratotype Section and Point for the Anthropocene series2023/04Michinobu Kuwae Bruce P. Finney Zhiyuan Shi Aya Sakaguchi Narumi Tsugeki Takayuki Omori Tetsuro Agusa Yoshiaki Suzuki Yusuke Yokoyama Hirofumi Hinata Yoshio Hatada Jun Inoue Kazumi Matsuoka Misaki Shimada Hikaru Takahara Shin Takahashi Daisuke Ueno Atsuko Amano Jun Tsutsumi Masanobu Yamamoto Keiji Takemura Keitaro Yamada Ken Ikehara Tsuyoshi Haraguchi Stephen Tims Michaela Froehlich Leslie Keith Fifield Takahiro Aze Kimikazu Sasa Tsutomu Takahashi Masumi Matsumura Yukinori Tani Peter R. Leavitt Hideyuki Doi Tomohisa Irino Kazuyoshi Moriya Akira Hayashida Kotaro Hirose Hidekazu Suzuki Yoshiki SaitoAnthropocene Review10/ 1, 49-86Research paper (scientific journal)10.1177/20530196221135077For assessment of the potential of the Beppu Bay sediments as a Global boundary Stratotype Section and Point (GSSP) candidate for the Anthropocene, we have integrated datasets of 99 proxies. The datasets for the sequences date back 100 years for most proxy records and 1300 years for several records. The cumulative number of occurrences of the anthropogenic fingerprint reveal unprecedented increases above the base of the 1953 flood layer at 64.6 cm (1953 CE), which coincides with an initial increase in global fallout of 239Pu+240Pu. The onset of the proliferation of anthropogenic fingerprints was followed by diverse human-associated events, including a rapid increase in percent modern 14C in anchovy scales, changes in nitrogen and carbon cycling as recorded by anchovy δ15N and δ13C, elevated pollution of heavy metals, increased deposition of novel materials (spheroidal carbonaceous particles, microplastics, polychlorinated biphenyls), the occurrence of hypoxia (Re/Mo ratio) and eutrophication (biogenic opal, TOC, TN, diatoms, chlorophyll a), unprecedented microplankton community changes (compositions of carotenoids, diatoms, dinoflagellates), abnormally high spring air temperatures as inferred from diatom fossils, and lithological changes. These lines of evidence indicate that the base of the 1953 layer is the best GSSP level candidate in the stratigraphy at this site.
A 75-year history of microplastic fragment accumulation rates in a semi-enclosed hypoxic basin2023/01/01Hirofumi Hinata Michinobu Kuwae Narumi Tsugeki Issei Masumoto Yukinori Tani Yoshio Hatada Hayato Kawamata Atsuomi Mase Kenki Kasamo Kazuya Sukenaga Yoshiaki SuzukiScience of the Total Environment854Research paper (scientific journal)10.1016/j.scitotenv.2022.158751Plastic budgets in the marine environment and their long-term trends are yet to be fully understood. Measuring the accumulation rates in bottom sediments is crucial to solving the riddle of missing ocean plastics. Previous studies based on coastal sediment cores have found that accumulation rates have increased with increases in plastic production and/or regional populations. However, the correlations between the rates and bioactivities or ocean dynamics, which are crucial for modeling the microplastic sinking process, have not been examined. We revealed a 75-year microplastic fragment (0.3–5.0 mm) accumulation rate history in a hypoxic basin, Beppu Bay, Japan, based on multi-core analysis and 210Pb dating of the sediment which was cross-checked by time control with 137Cs radioactivity peaks. We found that a long-term linear increasing trend with an approximately 20-year variation overlapped with significant peaks around 1990 and 2014 with the first polypropylene microplastic fragment detected from a 1958.8–1961.0 CE sediment layer. The maximum rate was 203 pieces m−2 y−1 with an abundance of 86 pieces kg−1-dry in 2014. Smaller fragments in the size range of 0.3–2.0 mm have been consistently dominant in terms of the accumulation rate throughout the 1955–2015 period, accounting for 85.3 % of the total accumulation rate. The three major polymers (polyethylene, polypropylene, and polystyrene) accounted for 96.6 % of the total rate. The rate was highly and positively correlated with the chlorophyll-a accumulation rate and concentration in the sediment. Based on the microplastic accumulation rates and concentration in the seawater, the mean sinking velocity of microplastics was estimated to be in the order of 101 m d−1. Our results will contribute to significant progress in modeling the microplastic sinking process by offering the first field measurement-based mean sinking velocity and significant correlations between the rate and bioactivity-related signals.

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Presentations

Bottom sediments in a hypoxic basin as a recording medium of microplastic pollution history12th Singapore International Chemistry Conference2024/12/11Oral presentation(invited, special)
Numerical reproduction of a 75-year history of microplastics accumulation rates in a semi-enclosed hypoxic basinThe 2nd Japan-Thailand Bilateral Symposium of Advanced Materials for Sustainable Society2024/12/02
Incorporating Measurement Error Distribution into Tsunami Data Assimilation using High-Frequency Radar (PDF:0.1MB) [slide(PDF:5.2MB)]10th International Symposium on Data Assimilation2024/10/25Oral presentation(general)
海水中でのプラスチック表面への生物付着とそれに伴う密度変化の実測日本海洋学会2024年度秋季大会2024/09/19Oral presentation(general)
Three-Dimensional Simulation of Microplastic Dynamics Incorporating Upward Terminal Velocities in Hiroshima Bay日本海洋学会2024年度秋季大会2024/09/19Oral presentation(general)