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公江 仁一
大学院海事科学研究科 海事科学専攻
助教

研究者基本情報

■ 学位
  • 博士（工学）, 大阪大学
■ 研究キーワード
  • 大阪湾
  • 機械学習 深層学習
  • 海洋学 湖沼学
  • 重力流
  • 成層構造
  • 水理学
  • 気候変動
  • 琵琶湖
  • 衝撃波
  • キャビテーション
■ 研究分野
  • 自然科学一般 / 大気水圏科学
  • フロンティア（航空・船舶） / 船舶海洋工学
  • 環境・農学 / 環境動態解析

研究活動情報

■ 論文
  • Bohan Zhang, Jinichi Koue, Tenda Okimoto, Katsutoshi Hirayama
    2025年07月, Journal of Marine Science and Engineering
    研究論文（学術雑誌）

  • Jinichi Koue
    2025年06月, Geosciences
    研究論文（学術雑誌）

  • Ruolan Zhang, Xingchen Ji, Jinichi Koue, Katsutoshi Hirayama
    Springer Science and Business Media LLC, 2025年04月, Journal of Marine Science and Application
    研究論文（学術雑誌）

  • Jinichi Koue
    This study provides a comprehensive examination of colliding density currents with a range of density differences from 1% to 4%, using controlled laboratory experiments with saltwater and freshwater. The research reveals that when density currents collide, they generate internal bore, with the denser fluid flowing consistently beneath the lighter fluid. A significant finding is the temporary stalling and oscillatory motion of the current fronts during collisions, which is linked to a partial dissipation of kinetic energy and the subsequent formation of internal waves. Numerical simulations showed close agreement with experimental observations, reproducing the location of the tidal fronts well and verifying the accuracy of the hydrodynamic model used. Moreover, the study demonstrates that collisions between fluids with different densities notably enhance diffusion and mixing efficiency. This has important implications for environmental science, particularly in understanding and predicting density-driven fluid dynamics in aquatic systems such as estuaries and coastal zones. The enhanced mixing efficiency observed could be crucial for applications in environmental and pollution control, offering insights into material transport and pollutant dispersion.
    MDPI AG, 2025年02月, Journal of Marine Science and Engineering, 13(2) (2), 363 - 363
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • Jinichi Koue
    2025年01月, Water
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • Jinichi Koue
    AbstractThis study investigates the intricate dynamics of nutrient transport and stratification in Lake Biwa, highlighting the significant impact of river inflows on water quality. Utilizing a validated three-dimensional flow field model and ecosystem model including a bottom sediment model, the analysis revealed that nutrient concentrations, specifically NH₄⁺, NO₂⁻, NO₃⁻, and PO₄3⁻, exhibited pronounced seasonal variations. In the RN_double scenario, NH₄⁺ and NO₂⁻ concentrations demonstrated a slight increase of 0.1 µg/L, respectively, while NO₃⁻ concentrations rose by 0.05–0.10 µg/L in response to precipitation changes. Conversely, in the RN_half scenario, NH₄⁺ and NO₂⁻ concentrations decreased, with NO₃⁻ seeing a more substantial decline of approximately 0.1 µg/L, attributed to reduced precipitation. PO₄3⁻ levels exhibited a maximum decrease of 0.03 µg/L from summer to autumn. Furthermore, simulations limiting nutrient inflows indicated a modest reduction in concentrations: NH₄⁺ decreased by approximately 0.03 µg/L during summer, and NO₂⁻ decreased by around 0.05 µg/L from spring to summer. The results suggest that while immediate improvements in dissolved oxygen levels are limited, effective long-term nutrient management could stabilize oxygen concentrations and improve overall water quality. These findings underscore the necessity for comprehensive water management strategies to mitigate eutrophication effects and support the ecological health of Lake Biwa.
    2024年12月, Terrestrial, Atmospheric and Oceanic Sciences, 英語
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • Jinichi Koue
    Density currents, fluid flows driven by differences in density, play a crucial role in disaster prevention for water pollution and tsunami mitigation, particularly due to thermal releases from power plants. Understanding their dynamics is pivotal for effective mitigation strategies. While the influence of seabed and lake bottom topography on density currents is well-studied, research on how embankment shapes affect these currents has been limited. This study aimed to fill this gap by experimentally and numerically analyzing the flow dynamics of density currents using various embankment shapes in a controlled water tank environment. The findings revealed distinct variations in density perturbation across different embankment shapes. Specifically, density currents exhibited reduced head velocities in embankments shaped as right-angled triangles, rectangles, and L-shapes, in that sequential order. This research underscores the significance of embankment design in modifying density currents, offering valuable insights for optimizing disaster management strategies related to water pollution and tsunami hazards induced by thermal effluents from industrial sources.
    2024年11月, Water, 英語
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • Akihisa Abe, Jinichi Koue
    2024年07月, Marine Engineering, 英語
    研究論文（学術雑誌）

  • Jinichi Koue
    2024年07月, Water (Switzerland), 16(13) (13)
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • Jinichi Koue, Saori Shyu, Akihisa Abe
    International Society of Offshore and Polar Engineers, 2024年03月, International Journal of Offshore and Polar Engineering, 34(1) (1), 93 - 100
    [査読有り]
    研究論文（学術雑誌）

  • Jinichi Koue, Satoshi Onishi, Akihisa Abe
    International Society of Offshore and Polar Engineers, 2024年03月, International Journal of Offshore and Polar Engineering, 34(1) (1), 67 - 74
    [査読有り]
    研究論文（学術雑誌）

  • Jinichi Koue
    2024年, Acta Geochimica
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • Jinichi Koue
    Abstract Climate change-induced extreme weather events, including prolonged droughts and intense rainfall, exert a significant influence on river inflows. These inflows act as vital conduits for nutrient transport, water quality modulation, and the regulation of thermal dynamics in lakes and oceans. In this context, this study conducts a comprehensive examination of the multifaceted effects stemming from river water characteristics, snowmelt water influence, and shifts in precipitation patterns on the stratification dynamics of Lake Biwa in Japan. To facilitate these investigations, a hydrodynamic model was developed to simulate thermal stratification in Lake Biwa. The results demonstrate that an increase in precipitation and river water flow, specifically doubling these factors, leads to noticeable cooling of the lake’s surface layer and a consequent destabilization of stratification during the stratification period. Conversely, halving these factors stabilizes stratification. Furthermore, elevating river water temperature by 5 °C raises water temperature near the upper thermocline, encouraging vertical mixing within the surface layer. Conversely, a 5 °C decrease induces significant temperature fluctuations and an unstable stratification extending from the surface to deeper layers. Notably, the spatial variance in water temperature within Lake Biwa is profoundly influenced by fluctuations in river water temperature. This study underscores the critical importance of considering river plumes in the study of material circulation, stratification dynamics, and ecological well-being in lakes and oceans. Given the mounting concerns related to eutrophication and the prevalence of anoxia in aquatic ecosystems, this research provides invaluable insights into assessing the impacts of river plumes on Lake Biwa’s stratification structure and seasonal dynamics.
    Springer Science and Business Media LLC, 2023年12月, Environmental Processes, 10(4) (4)
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • Jinichi Koue
    2023年05月, Theoretical and Applied Mechanics Letters, 100439
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • EFFECTS OF STRONG WINDS ON THE BOTTOM LAYER DURING THE WEAK STRATIFICATION PERIOD IN LAKE BIWA, JAPAN
    Jinichi Koue
    2023年04月, International Journal of GEOMATE, Vol. 24(104), 44 - 52
    [査読有り]

  • DYNAMIC EFFECTS OF THE HEAD EDGE BEHAVIOR OFGRAVITY CURRENT
    Jinichi Koue
    2023年03月, International Journal of GEOMATE, Vol. 24(103), 128 - 135
    [査読有り]

  • Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    Abstract The currents of gyre (circulation) flow play an important role in the transportation and mixing of dissolved or suspended nutrients and chemical substances. In recent years, the climate change has affected the flow field in Lake Biwa. However, how much the climate change can influence the flow field has not been clarified enough yet. In the present study, using a three-dimensional hydrodynamic model, we investigated the effect of changes in air temperature, wind speed, and precipitation on the change of the flow field in Lake Biwa. For sensitivity analysis, numerical simulations were performed for a baseline case using realistic meteorological data from 2007 to 2012, as well as hypothetical cases using meteorological data. The analysis revealed that the change in air temperature and precipitation changed stratification and vorticity in the surface layer in each season. The strength of the stratification affected the gyre strength in the surface layer. The change in wind speed, on the other hand, changed the wind stress acting on the lake's surface, influencing the strength of gyre significantly. Increased wind speed lengthened the radius of the gyre in Lake Biwa, while decreased wind speed made it weaker above and below the thermocline.
    IWA Publishing, 2023年03月, Journal of Hydroinformatics
    [査読有り]
    研究論文（学術雑誌）
    神戸大学リポジトリ（Kernel）へのリンク

  • STUDY ON THE ANALYSIS OF THE CONTROLLING FACTORS OF HYPOXIA IN THE BOTTOM OF LAKE BIWA, JAPAN
    Jinichi Koue
    2023年02月, International Journal of GEOMATE, 24(102) (102), 101 - 108
    [査読有り]

  • Jinichi Koue
    2023年01月, International Journal of GEOMATE, 24(101) (101), 11 - 117
    [査読有り]
    研究論文（学術雑誌）

  • Jinichi Koue
    2022年01月, HYDROLOGY, 9(1) (1), 英語
    [査読有り]
    研究論文（学術雑誌）

  • Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    2020年02月, INTERNATIONAL JOURNAL OF GEOMATE, 18(66) (66), 56 - 61, 英語
    [査読有り]
    研究論文（学術雑誌）

  • Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    Climatic factors such as air temperature and wind speed can affect the structure of stratification in Lake Biwa. In general, the rise in air temperature and the decrease in wind speed weaken the vertical mixing and strengthen the structure of the stratification, which interrupts the transport of the substances. However, how much the change of each climate element can influence the structure of the stratification is not clarified. Therefore, it is important to evaluate the effects of each element on the stratification quantitatively. In the present study, we investigated the effect of the change in air temperature and wind speed on the seasonal change of stratification in Lake Biwa by using a three-dimensional hydrodynamic model. Numerical simulations were carried out for a baseline case using realistic meteorological data from 2007 to 2012 and hypothetical cases using meteorological data with modified air temperature or wind speed for sensitivity analysis. The analysis showed that the increase and decrease in air temperature changed the vertical water temperature uniformly in almost all layers. Thus, the strength of the stratification is hardly changed. The increase and decrease in wind speed, however, altered the water temperature near the surface of the lake, so that it significantly influenced the stratification. The increase in wind speed made the water parcels of the surface layer well mixed, and the decrease in wind speed made the mixed layer thinner.
    MDPI AG, 2018年10月, Water, 10(10) (10), 1492 - 1492
    [査読有り]
    研究論文（学術雑誌）

  • Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    MDPI AG, 2018年01月, Water (Switzerland), 10(1) (1), 英語
    [査読有り]
    研究論文（学術雑誌）

  • Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    GEOMATE International Society, 2018年, International Journal of GEOMATE, 14(45) (45), 35 - 40, 英語
    [査読有り]
    研究論文（学術雑誌）

  • 公江 仁一, 嶋寺 光, 近藤 明


    近年，琵琶湖の底層の溶存酸素濃度が低下していることが問題となっている．この底層の溶存酸素濃度の低下傾向の原因として考えられるのが，過去20年間の降水量の減少(約100mm)，気温の上昇(約1～2℃)，風速の減少(約5%)などの気候変動である．特に，気温の上昇や風速の減少は湖水の鉛直混合を弱め，底層の溶存酸素濃度が低下する原因となる可能性がある．水温の成層構造の季節変化を詳細にモデルで再現できれば，物質循環の変動も明らかにできる．
    本研究では，将来的に温暖化に伴う成層構造の変化がどの程度，貧酸素化に影響があるのかを明らかにしていくために，観測された水温鉛直分布を再現できるモデルを構築することで，湖内の水温成層構造の季節経年変化が再現できることを示している．3次元流動場モデルを構築することで，流動場，物質循環の挙動を時空間的に詳細に解析することができる．また，3次元モデルで，冬季の鉛直混合が再現でき，夏季における表層に存在する環流についても再現できた．
    水文・水資源学会, 2016年, Proceedings of 2016 Annual Conference, Japan Society of Hydrology and Water Resources, 29, 21 - 21, 日本語
    [査読有り]

  • 2009年06月, International Offshore and Polar Engineering
    [査読有り]

  • 2008年11月, 日本船舶海洋工学会 関西支部秋季講演会
    [査読有り]

■ 講演・口頭発表等
  • Study on Underwater Wave Phenomena and Bubble Formation Induced by Impact Bending of Bar Materials in Contact with the Water Surface
    Akihisa Abe, Jinichi Koue, Takehiro Fujimoto
    The 35th International Symposium on Shock Waves (ISSW35), 2025年07月

  • Study on Confined Cavitation Jet Behavior with Underwater Shock Waves for Removal of Marine Sessile Organisms
    Jinichi Koue, Akihisa Abe, Haruo Mimura
    The 35th International Symposium on Shock Waves (ISSW35), 2025年07月

  • 河口部における流況制御が琵琶湖の水質環境に与える影響の解析
    川村竜斗, 公江仁一
    第59日本水環境学会年会, 2025年03月

  • 平板間隙内キャビテーション噴流の衝撃波生成に関する研究
    公江仁一, 阿部晃久, 三村治夫
    2024年度衝撃波シンポジウム, 2025年03月

  • 放電誘起キャビテーション噴流の衝撃波生成特性に関する研究
    公江仁一, 阿部晃久
    2024年度衝撃波シンポジウム, 2025年03月

  • 金属棒材の打撃で誘起される水中衝撃波動と気泡生成挙動に関する研究
    阿部晃久, 公江仁一, 藤本岳洋
    2024年度衝撃波シンポジウム, 2025年03月

  • Consideration of the Impact of River Inflows on Nutrient Dynamics and Water Quality in Enclosed Water Area
    Jinichi Koue
    The 14th International Conference on Geotechnique, Construction Materials and Environment, GEOMATE,, 2024年11月

  • 閉鎖性水域における底泥の栄養塩・有機物濃度による密度変化の影響
    公江仁一
    土木学会 第52回環境システム研究論文発表会, 2024年11月

  • 水中で軸衝撃を受けた棒材周囲の衝撃波生成と水中騒音に関する研究
    公江仁一, 鄒思織, 阿部晃久
    2023年度衝撃波シンポジウム, 2024年03月

  • キャビテーション噴流生成衝撃波の海洋付着生物除去への活用に関する考察
    阿部晃久, 公江仁一
    2023年度衝撃波シンポジウム, 2024年03月

  • 先端形状が異なる飛翔体の水中貫入による速度減衰効果の考察
    宮下晃, 公江仁一, 阿部晃久
    高速度イメージングとフォトニクスに関する総合シンポジウム, 2023年12月

  • Exploring the Dynamics of River Inflow and its Effects on the Deep Layer of Lake Biwa through Numerical Simulations
    Jinichi Koue
    13th International Conference on Geotechnique, Construction Materials and Environment, 2023年11月

  • Generation and behavior of underwater shock waves and microbubbles produced by metal plate discharge
    Jinichi Koue, Akihisa Abe
    The 34th International Symposium on Shock Waves (ISSW34), 2023年07月

  • Experimental analysis of underwater noise produced by impacted bars
    Jinichi Koue, Saori Shyu, Akihisa Abe
    23rd International Offshore and Polar Engineering Conference, 2023年06月

  • Compressible hydrodynamic consideration of cavitating jets on the scraping action of organisms attached on marine structures
    Jinichi Koue, Satoshi Onishi, Akihisa Abe
    23rd International Offshore and Polar Engineering Conference, 2023年06月

  • 水中衝撃波と弾性膜の干渉によるOHラジカルの生成効果
    山下 理央, 公江 仁一, 阿部 晃久
    2022年度衝撃波シンポジウム, 2023年03月

  • 先端形状が異なる飛翔体の水中貫入に伴う周囲流れの解析
    平井 龍志, 公江 仁一, 阿部 晃久
    2022年度衝撃波シンポジウム, 2023年03月

  • 金属板を介した水中放電による衝撃波と微小気泡生成
    丸山 泉輝, 公江 仁一, 阿部 晃久
    2022年度衝撃波シンポジウム, 2023年03月

  • Analysis of Seasonal and Interannual Variations in Dissolved Oxygen Concentration at the Bottom of Lake Biwa, Japan
    Jinichi Koue
    8th International Conference on Structure, Engineering and Environment, 2022年11月

  • 付着物除去効果向上のためのキャビテーション噴流挙動の観測と解析
    大西智士, 公江仁一, 阿部晃久
    第92回（令和４年）マリンエンジニアリング学術講演会, 2022年10月

  • 洋上風車パイル打設時の水中騒音発生メカニズムに関する研究
    鄒 思織, 宮下 晃, 公江 仁一, 阿部 晃久
    第92回（令和４年）マリンエンジニアリング学術講演会, 2022年10月

  • Formation of metal carbide by electrochemical reduction of CO2 in molten LiCl-KCl
    Fukuda Haruka, Yamada Atsushi, Koue Jinichi, Suzuki Yuta, Goto Takuya, Isogai Tomohiro, Yamauchi Akiyoshi, Kishikawa Yosuke
    The 53th Symposium on Molten Salt Chemistry, 2021年11月

  • Electrochemical Behavior of CO2 reduction in a phosphonium-based ionic liquid
    Tchorap-Yamamoto Shoma, Koue Jinichi, Suzuki Yuta, Kobatake Hidekazu, Goto Takuya, Isogai Tomohiro, Yamauchi Akiyoshi, Kishikawa Yosuke
    The 53th Symposium on Molten Salt Chemistry, 2021年11月

  • Electrochemical reduction of CO2 in [DEME][BF4] containing H2O, The 53th Symposium on Molten Salt Chemistry
    Kozasa Kentaro, Koue Jinichi, Suzuki Yuta, Goto Takuya, Isogai Tomohiro, Yamauchi Akiyoshi, Kishikawa Yosuke
    The 53th Symposium on Molten Salt Chemistry, 2021年11月

  • Effect of change of each meteorological element on the circulation in Lake Biwa, Japan
    Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    ECSA 58 - EMECS 13 Estuaries and coastal seas in the Anthropocene, 2021年09月

  • Numerical simulation for seasonal and inter-annual change of dissolved oxygen in Lake Biwa, Japan
    Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    9th International Conference on Geotechnique, Construction Materials and Environment, 2019年11月

  • Individual difference in skin blood flow with air temperature variation
    Otsuka Y, Maeda T, Shiochi S, Matsuo T, Shimadera H, Koue J, Kondo A
    International Workshop on Environmental Engineering 2019, 2019年06月

  • Sensitivity Analysis of Structure of the Stratification in Lake Biwa by Changing Meteorological Elements
    Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    Conference: 17th world lake conference, 2018年10月

  • Numerical assessment of the impact of strong wind on thermal stratification in Lake Biwa
    Jinichi Koue, Hikari Shimadera, Tomohito Matsuo, Akira Kondo
    7th International Conference on Geotechnique, Construction Materials and Environment, 2017年11月

  • 琵琶湖における成層構造の季節経年変動の再現性
    公江仁一, 嶋寺光, 近藤明
    水文・水資源学会, 2016年09月

  • 琵琶湖流動場モデルによる温度成層の再現性評価
    公江仁一, 近藤明, 嶋寺光, 武川さゆみ, 劉彦妮
    空気調和・衛生工学会近畿支部学術研究発表会, 2016年03月

  • Structure of the Head of Gravity Currents in a Long Channel
    Jinichi Koue, Takuya Katayama, Testuo Katsuragi, Nobuhiro Baba, Kenichi Kitaura
    19th International Offshore and Polar Engineering Conference, 2009年06月

  • 密度界面の不連続性における数値振動を抑制するスキームの開発
    公江仁一
    日本船舶海洋工学会 関西支部秋季講演会, 2008年11月

■ 所属学協会
  • 水環境学会

  • 衝撃波学会

  • 電気化学会

  • マリンエンジニアリング学会

  • 土木学会

  • 水文水資源学会

  • 日本船舶海洋工学会

■ 共同研究・競争的資金等の研究課題
  • 環流と内部波を利用した持続可能な閉鎖性水域の水循環系構築と評価
    公江 仁一
    日本学術振興会, 科学研究費助成事業, 若手研究, 神戸大学, 2024年04月01日 - 2027年03月31日

  • キャビテーション噴流の付着海洋生物剥離機構の解明と剥離除去効果域拡大ノズルの開発
    阿部 晃久, 藤本 岳洋, 公江 仁一, 三村 治夫
    日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, 2023年04月01日 - 2027年03月31日

  • 閉鎖性水域の貧酸素化の解消改善方法の提案
    公江仁一
    環境再生保全機構, 環境研究総合推進費, 神戸大学, 2023年04月 - 2026年03月, 研究代表者

  • 気候変動と富栄養化が閉鎖性水域に及ぼす影響評価
    公江仁一
    ひょうご科学技術協会, 学術研究助成金, 神戸大学, 2023年04月 - 2024年03月, 研究代表者

■ 産業財産権
  • 一酸化炭素、又は有機化合物の製造方法
    後藤 琢也, 公江 仁一, 鈴木 祐太, 小笹 健太郎, 野崎 紗矢, チョラプ山本笙真, 磯貝 智弘, 岸川 洋介, 山内 昭佳
    特願2022-019162, 2022年02月10日, 特開2022-123865
    特許権

  • METHOD FOR MANUFACTURING CARBON MONOXIDE OR ORGANIC COMPOUND
    GOTO Takuya, KOUE Jinichi, SUZUKI Yuta, KOZASA Kentaro, NOZAKI Saya, TCHORAP-YAMAMOTO Shoma, ISOGAI Tomohiro, KISHIKAWA Yosuke, YAMAUCHI Akiyoshi
    特願PCT/JP2022/005415
    特許権

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