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Dynamics of self-propelling vortex pairs

Research Project

Project/Area Number 21K03655
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17020:Atmospheric and hydrospheric sciences-related
Research InstitutionHokkaido University

Principal Investigator

Nakamura Tomohiro  北海道大学, 低温科学研究所, 講師 (60400008)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords海洋物理 / 海洋 / 渦 / 渦対 / 物質輸送 / 河川水 / 潮流 / 渦潮 / 乱流 / 沿岸から外洋への輸送
Outline of Research at the Start

本研究は、沿岸から外洋へ河川水・物質を効果的に輸送する「渦対」について調べる。沿岸は、陸や人と外洋のインターフェースであり、多くの陸・人為起源物質が沿岸を介して外洋へ広がる。渦対は、2つの渦がペアとなり、互いに互いを同じ方向へ動かすことで「自走」する。そのため、渦中の水や物質を遠方まで輸送する。しかも河川水流出により形成される渦対は、流出物質の多い大規模出水時に生じるため、二重に効果的な物質輸送が生じうる。しかし、従来の研究はこのような状況を想定していない。そこで数値実験により、新たな渦対像の構築を目指す。

Outline of Final Research Achievements

Coasts serve as the interface between land and open oceans, with many terrestrial and anthropogenic substances spreading from coasts to open oceans. However, the processes of transport from coasts to open oceans are largely unknown, and one of such processes is 'vortex pairs,' which effectively induce transport. In this study, we showed (1) effects of density stratification and topography on the formation and evolution of vortex pairs, the behavior of vortex pairs accompanied by small vortices, and the formation of vortex pairs accompanying river water discharge. The results obtained would contribute to the better understanding and improvement of modeling of water and substance transport from rivers and coasts to the open ocean.

Academic Significance and Societal Importance of the Research Achievements

本課題は、沿岸から外洋へ水・物質を効果的に輸送する「渦対」について研究し、河川水流出により渦対が形成されることを明らかにした。得られた知見は、海洋物理学・流体力学の発展に加えて、河川・沿岸から外洋への海水・物質輸送の解明・モデリングの向上に資する。河川から供給された淡水や物質が外洋でどこまで広がるかは、海洋の子午面循環や栄養物質循環・基礎生産を左右することから、海洋内炭素貯留への寄与を介して気候変動に影響する。さらに、近海の栄養物質循環や基礎生産は水産業や沿岸域の水質維持にも影響する。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (24 results)

All 2024 2023 2022 2021

All Journal Article (9 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 9 results,  Open Access: 9 results) Presentation (14 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Book (1 results)

  • [Journal Article] Coastal Monitoring, Shipboard Observations, and Mooring Observations around the Shiretoko Area2024

    • Author(s)
      中村知裕,野別貴博,嶋田宏,美坂正,西岡純,藤尾伸三,柳本大吾,三谷曜子,山村織生,三寺史夫
    • Journal Title

      低温科学

      Volume: 82 Pages: 153-160

    • DOI

      10.14943/lowtemsci.82.153

    • ISSN
      1880-7593
    • Year and Date
      2024-03-29
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Far-Reaching Effects of Okhotsk Sea Ice Area on Sea Surface Heat Flux, Lower Atmosphere, and Ocean Mixed Layer2024

    • Author(s)
      Nakamura Tomohiro、Takahashi Yusuke、Nakanowatari Takuya、Mitsudera Humio
    • Journal Title

      Journal of Climate

      Volume: 37 Issue: 2 Pages: 569-583

    • DOI

      10.1175/jcli-d-23-0239.1

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Vortex pairs formed by tidal currents in the Naruto Strait: effects of bottom topography, density stratification, and coastline geometry2023

    • Author(s)
      Nakamura Tomohiro、Yamaguchi Takuya、Nakada Satoshi、Matsumura Yoshimasa
    • Journal Title

      Journal of Oceanography

      Volume: 80 Issue: 2 Pages: 85-97

    • DOI

      10.1007/s10872-023-00709-1

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Impact of a Large Shallow Semi‐Enclosed Lagoon on Freshwater Exchange Across an Inlet Channel2023

    • Author(s)
      Kida Shinichiro、Tanaka Kiyoshi、Isada Tomonori、Nakamura Tomohiro
    • Journal Title

      Journal of Geophysical Research: Oceans

      Volume: 129 Issue: 1 Pages: 19755-19755

    • DOI

      10.1029/2023jc019755

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Three Regimes of Internal Gravity Wave-Stable Vortex Interaction Classified by a Nondimensional Parameter δ: Scattering, Wheel-Trapping, and Spiral-Trapping with Vortex Deformation2023

    • Author(s)
      Ito Kaoru、Nakamura Tomohiro
    • Journal Title

      Journal of Physical Oceanography

      Volume: 53 Issue: 4 Pages: 1087-1106

    • DOI

      10.1175/jpo-d-21-0309.1

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Two species of seabirds foraged in contrasting marine habitats across the cold-water belt along the coast of northern Hokkaido in the southwestern Okhotsk Sea2022

    • Author(s)
      Nishizawa Bungo、Okado Jumpei、Mitani Yoko、Nakamura Tomohiro、Yamaguchi Atsushi、Mukai Tohru、Watanuki Yutaka
    • Journal Title

      Fisheries Science

      Volume: 88 Issue: 1 Pages: 109-118

    • DOI

      10.1007/s12562-021-01576-9

    • NAID

      40022822404

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Biogeochemical and physical linkages between the Arctic Ocean and Sub-Arctic Pacific through marginal seas2022

    • Author(s)
      Nishioka Jun、Yasuda Ichiro、Hirawake Toru、Nakamura Tomohiro、Kondo Yoshiko、Volkov Yuri N.
    • Journal Title

      Progress in Oceanography

      Volume: 203 Pages: 102768-102768

    • DOI

      10.1016/j.pocean.2022.102768

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Interannual to decadal variability of phosphate in the Oyashio region: Roles of wind-driven ocean current and tidally induced vertical mixing in the Sea of Okhotsk2021

    • Author(s)
      Nakanowatari Takuya、Nakamura Tomohiro、Mitsudera Humio、Nishioka Jun、Kuroda Hiroshi、Uchimoto Keisuke
    • Journal Title

      Progress in Oceanography

      Volume: 197 Pages: 102615-102615

    • DOI

      10.1016/j.pocean.2021.102615

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Tidally modified western boundary current drives interbasin exchange between the Sea of Okhotsk and the North Pacific2021

    • Author(s)
      Shu Hung-Wei、Mitsudera Humio、Yamazaki Kaihe、Nakamura Tomohiro、Kawasaki Takao、Nakanowatari Takuya、Nishikawa Hatsumi、Sasaki Hideharu
    • Journal Title

      Scientific Reports

      Volume: 11 Issue: 1 Pages: 12037-12037

    • DOI

      10.1038/s41598-021-91412-y

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 知床の海をモニターする2024

    • Author(s)
      中村知裕
    • Organizer
      低温科学研究所公開シンポジウム「世界自然遺産知床周辺海域の海洋・海氷変動予測と海洋生態系への影響」
    • Related Report
      2023 Annual Research Report
  • [Presentation] Ocean monitoring and ship observations around Shiretoko: 22024

    • Author(s)
      T. Nakamura, T. Nobetsu, H. Shimada, T. Misaka, J. Nishioka, Y Mitani, O. Yamamura and H. Mitsudera
    • Organizer
      The 38th International Symposium on the Okhotsk Sea & Polar Oceans 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] Long-term variations of water masses in the southern part of the Okhotsk Sea using public and unpublished data2024

    • Author(s)
      K. Ito, T. Nakamura, T. Misaka
    • Organizer
      The 38th International Symposium on the Okhotsk Sea & Polar Oceans 2024
    • Related Report
      2023 Annual Research Report
  • [Presentation] 北海道オホーツク海陸棚の海底混合層・高濁度水とその行方2023

    • Author(s)
      植田純生、〇中村知裕、河野時廣、伊藤薫
    • Organizer
      日本海洋学会2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] アイオン・ストリームと親潮域における鉄の季節変化2023

    • Author(s)
      張振龍、中村知裕、西岡純
    • Organizer
      日本海洋学会2023年度秋季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Impact of a Semi-enclosed Estuary on Freshwater Outflow and Biogeochemical Response for a Small-scale River2023

    • Author(s)
      Kida, S., K. Tanaka, T. Isada, T. Nakamura
    • Organizer
      AOGS2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] Seasonal mixed-layer dissolved Iron variation in the Oyashio region2023

    • Author(s)
      張 振龍、中村 知裕、西岡 純
    • Organizer
      JpGU2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] 広範囲に捉えた河川フロントの流速場の推定2023

    • Author(s)
      杉原 光都、木田 新一郎、中村 知裕、横松 和
    • Organizer
      JpGU2023
    • Related Report
      2023 Annual Research Report
  • [Presentation] 夏季オホーツク海北海道沿岸の水塊:タタール海峡水・海底混合層・北部根室海峡に注目して2023

    • Author(s)
      中村知裕、植田純生、野別貴博、美坂正、三谷曜子、西岡純、三寺史夫
    • Organizer
      令和5年度日本水産学会春季大会シンポジウム「知床周辺海域のホットスポット形成:海洋環境から高次捕食者まで」
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Ocean monitoring and ship observations around Shiretoko2023

    • Author(s)
      T. Nakamura, T. Nobetsu, T. Misaka, J. Nishioka, Y Mitani, O. Yamamura and H. Mitsudera
    • Organizer
      The 37th International Symposium on the Okhotsk Sea & Polar Oceans 2023
    • Related Report
      2022 Research-status Report
  • [Presentation] 渦対の数値シミュレーション:鳴門海峡の渦対への地形と密度成層の効果2022

    • Author(s)
      中村知裕・山口卓也・中田聡史・松村義正
    • Organizer
      2022年度海洋乱流の観測およびモデリングに関する研究集会
    • Related Report
      2022 Research-status Report
  • [Presentation] 河川水の流出過程に汽水湖が与える影響2022

    • Author(s)
      木田新一郎, 田中潔, 伊佐田智規, 中村知裕
    • Organizer
      日本海洋学会2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 北太平洋亜寒帯域における基礎生産量の長期変化に対する熱塩・風成循環の影響2022

    • Author(s)
      中野渡拓也, 中村知裕, 三寺史夫, 西岡純, 西川はつみ, 内本圭亮, 黒田寛
    • Organizer
      日本海洋学会2022年度秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Shiretoko marine project on prediction of sea ice variations due to climate change, and its impacts on biogeochemical processes and marine ecosystems2022

    • Author(s)
      H. Mitsudera, H. Ueda, T. Nakamura, J. Nishioka, O. Yamamura, R. Saiki, T. Usui, and T. Nakanowatari
    • Organizer
      The 36th International Symposium on the Okhotsk Sea & Polar Oceans
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Book] 気候系のhot spot:中緯度大気海洋相互作用の最前線(第8章)2021

    • Author(s)
      三寺史夫, 中村知裕, 田口文明, 浮田甚郎, 星一平
    • Total Pages
      374
    • Publisher
      日本気象学会
    • Related Report
      2021 Research-status Report

URL: 

Published: 2021-04-28   Modified: 2025-01-30  

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