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Numerical model for evaluating the safety of products from the sea towards the realization of a marine environmental risk map

Research Project

Project/Area Number 21H01543
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 24020:Marine engineering-related
Research InstitutionYokohama National University

Principal Investigator

Nishi Yoshiki  横浜国立大学, 大学院工学研究院, 教授 (70470052)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2022: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords環境リスク / 海洋環境 / モデリング / リスク評価 / 難分解性有機汚染物質 / 海洋モデル / 環境リスク評価 / 海洋汚染 / 数値シミュレーション / 確率過程 / 食の安全 / 河川水 / 沿岸域 / 確率微分方程式 / 数値モデル
Outline of Research at the Start

「沿岸海域から取れる水産物を食する行為はどの程度のリスクを伴うか?」この問いへの回答を得るため本研究は「海洋環境リスクマップ」を実現し社会へ提供する。沿岸域での海洋汚染物質による環境リスクの空間分布を数値計算により明らかとする。潮の流れ、魚類身体内での物質動態などの多様な現象を統合的に再現する数値モデルを創る。リスク要因として難分解性有機汚染物質とプラスチック粒子とを考慮する。手順は(1)大小両サイズ現象を繋ぐ確率過程論の定式化、(2)数値計算手法の設計と実装、(3)計算結果の検証およびリスクマッピングである。本研究の遂行は、海洋からの食糧源の品質保障に対し「食の安全」の側面からの貢献となる。

Outline of Final Research Achievements

This study has constructed models for representing physical, chemical, and biologicals processes occurring in persistent organic pollutants loaded into the ocean, and developed a simulation method that integrated these processes. An ocean simulation model of physical oceanography, which is a module of the integrated model, has been improved in the stability and accuracy of numerical computations. A model for representing some phenomena around an individual fish including intake, accumulation and egestion of the pollutants has been built and validated through comparisons with observation, demonstrating satisfying performance. In addition, considering also planktons other than the fish, a new probabilistic model has been constructed for simulating the movement of the pollutants in a marine ecosystem comprising these organisms. These outcomes enable one to produce probabilistic distributions of dietary intake of the pollutants by human.

Academic Significance and Societal Importance of the Research Achievements

本研究では、空間規模が大きな現象(潮流、物質の海水中の移流拡散など)と小さな現象(魚個体の運動や生理)とを統合させた視点を維持した。確率論を基盤として規模が異なる現象同士を統合する手法は本研究が創造したものである。また。ヒトが水産物として摂取する海洋生物体内に蓄積する汚染物質量をシミュレーションできる様にすれば、海洋環境リスクを定量的かつ合理的に提示することができる様になる。これにより、水産物の許容摂取の基準値に関して、従来よりも科学的根拠を備えた形で決めることを可能とする。

Report

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

    (9 results)

All 2024 2023 2022 2021

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Biomass-based stochastic model for the transfer of polychlorinated biphenyls in a marine food web2024

    • Author(s)
      Arai Riwa、Nishi Yoshiki
    • Journal Title

      Science of The Total Environment

      Volume: 912 Pages: 169270-169270

    • DOI

      10.1016/j.scitotenv.2023.169270

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sakawa River plume in Sagami Bay, Japan under weak wind condition: numerical simulation of coastal ocean dynamics and in situ observations for validation2024

    • Author(s)
      Arai Riwa、Nishi Yoshiki、Fujiwara Yasunori、Zhao Jinrui、Jamil Muhammad Zeeshan
    • Journal Title

      Journal of Marine Science and Technology

      Volume: 29 Issue: 1 Pages: 221-243

    • DOI

      10.1007/s00773-024-00985-6

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ocean model with adjustable arrangements of discrete variables: application to strong tidal flows and low salinity water2023

    • Author(s)
      Nishi, Y., Tabeta S., Fujiwara Y., Hatano T.
    • Journal Title

      Journal of Marine Science and Technology

      Volume: 28 Issue: 1 Pages: 208-220

    • DOI

      10.1007/s00773-022-00920-7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Stochastic model for simulating levels of polychlorinated biphenyls in small tuna and planktons using Metropolis-Hastings algorithm2022

    • Author(s)
      Wang Z., Nishi, Y.
    • Journal Title

      Ecotoxicology and Environmental Safety

      Volume: 242(1) Pages: 113941-113941

    • DOI

      10.1016/j.ecoenv.2022.113941

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Presentation] Simulation of polychlorinated biphenyls transfer during fish reproduction using dynamic energy budget theory2024

    • Author(s)
      Siwei Liu, Yoshiki Nishi
    • Organizer
      The 11th East Asian Workshop for Marine Environment and Energy
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Estimation of human Polychlorinated biphenyls exposure via tuna consumption using a probabilistic approach2024

    • Author(s)
      Jiunrui Zhao, Yoshiki Nishi
    • Organizer
      The 11th East Asian Workshop for Marine Environment and Energy
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] heng Kung University, Chairman of The 11th East Asian Workshop for Marine Environment and Energy), “Human physiologically based pharmacokinetic model to predict the uptake and distribution of PCB-153 through tuna consumption2024

    • Author(s)
      Muhammad Zeeshan Jamil, Yoshiki Nishi
    • Organizer
      The 11th East Asian Workshop for Marine Environment and Energy
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stochastic modelling of persistent organic pollutants ingestion by fish using Metropolis-Hastings sampling2021

    • Author(s)
      Zhiyi Wang, Yoshiki Nishi
    • Organizer
      The 10th East Asian Workshop for Marine Environment and Energy
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A small-scale model experiment on removal of microplastics from water flows using multiple floating filters2021

    • Author(s)
      Reyana Islam ,Yoshiki Nishi
    • Organizer
      The 10th East Asian Workshop for Marine Environment and Energy
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research

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

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