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Impact assessment of unexploded ordanance disposal at the seafloor and the construction of aggressive environmental load reduction techniques

Research Project

Project/Area Number 19K12393
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 64020:Environmental load reduction and remediation-related
Research InstitutionOkinawa National College of Technology

Principal Investigator

HIGA Yoshikazu  沖縄工業高等専門学校, 機械システム工学科, 教授 (20335368)

Co-Investigator(Kenkyū-buntansha) 井山 裕文  熊本高等専門学校, 生産システム工学系MIグループ, 教授 (40300660)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords海中不発弾処理 / 数値シミュレーション / 避難海域 / 可視化水槽 / 水中衝撃波 / 一次飛散物 / 不発弾 / 海中爆破処理 / 可視化 / 環境負荷低減化 / 離散化 / 港泊図 / 不発弾処理 / 影響評価
Outline of Research at the Start

不発弾海中爆破処理における影響評価を実験力学ならびに計算力学的視点により明らかにし,その海域へ及ぼす環境への影響を低減化する処理技術の提案を通して当該問題への貢献を行う.
具体的には,海中における不発弾爆破処理条件である①処理炸薬量,②周辺海域/海底地形の違いが,一次飛散物および水中衝撃波伝ぱ挙動に及ぼす影響について,スケールモデルでの可視化実験ならびに種々の影響因子を導入した計算機実験により明らかにする.さらに,これら詳細な観察・検証結果をベースに積極的な環境負荷低減化を目指した不発弾海中処理施工手法について提案し,提案手法による効果について可視化実験によって評価検証する.

Outline of Final Research Achievements

This study investigated the environmental impact assessment of underwater unexploded ordnance disposal from the perspectives of experimental mechanics and computational mechanics. The results of the investigation during the study period are as follows:1)The propagation behavior of underwater shock waves and the behavior of fragments such as shells, explosives, and soil were revealed in response to the conditions of UXO detonation (explosive amounts, seabed soil and processing water depth, etc.). 2)A small visualization tank that can control the internal pressure of the container was designed and manufactured, making it possible to directly observe the propagation of underwater shock waves in an environment that simulates the water depth and measure the pressure-time history. 3)Based on the above results, it was shown that it is possible to consider a method to reduce the evacuation area during underwater UXO detonation from the perspectives of experimental and computational mechanics.

Academic Significance and Societal Importance of the Research Achievements

実験力学および計算力学的視点により海中での不発弾爆破処理問題を明らかにすることで,理論的根拠に基づき避難区域が設定され,さらに当該避難区域を積極的に縮小化できる可能性を検討するための方法論を明らかにした.避難海域内の活動を制限することに起因する経済活動の停止および損失を最小限に抑えることができることは極めて有用な知見となる.一方,金属・土壌動特性を律速する固体力学分野に爆発的な燃焼を記述した熱力学+反応場と海水を律速する流体力学分野を含め,複層的かつ複雑に関連したマルチフィジックス現象を取り扱う問題であることから,学術的意義は極めて大きい.

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (17 results)

All 2023 2022 2021 2020 2019

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (12 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Study on High-Strain-Rate Deformation of Magnesium Alloy Using Underwater Shock Waves Generated by High-Voltage Electric Discharge of Thin Wire2022

    • Author(s)
      Iyama Hirofumi、Yamaguchi Hayato、Nishi Masatoshi、Higa Yoshikazu
    • Journal Title

      Metals

      Volume: 12 Issue: 11 Pages: 1939-1939

    • DOI

      10.3390/met12111939

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Computational Simulation for the Evaluation of a Food Softening Process Using Underwater Shockwaves2020

    • Author(s)
      Higa Yoshikazu, Shimojima Ken, Higa Osamu, Iyama Hirofumi and Itoh Shigeru
    • Journal Title

      ETP International Journal of Food Engineering

      Volume: Vol.6, No.1 Pages: 24-29

    • DOI

      10.18178/ijfe.6.1.24-29

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Computational modeling and simulation for unexploded ordnance disposal problem at the seabed2020

    • Author(s)
      Yoshikazu HIGA, Hirofumi IYAMA and Shigeru ITOH
    • Journal Title

      The International Organization of Scientific Research Journal of Mechanical and Civil Engineering

      Volume: 17(2)-2 Pages: 40-44

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Experimental observation for dynamic characteristics of “Shimajiri Mahji” and its evaluation using computational simulation2019

    • Author(s)
      Yoshikazu HIGA, Hirofumi IYAMA, Ken SHIMOJIMA, Osamu HIGA and Shigeru ITOH
    • Journal Title

      The International Journal of Multiphysics

      Volume: 13(3) Issue: 3 Pages: 241-251

    • DOI

      10.21152/1750-9548.13.3.241

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Magnesium Alloy Forming using Underwater Shock Wave by Wire Electric Discharge2019

    • Author(s)
      Hirofumi IYAMA, Yoshikazu HIGA, Masatoshi NISHI and Shigeru ITOH
    • Journal Title

      The International Journal of Multiphysics

      Volume: 13(3) Issue: 3 Pages: 269-282

    • DOI

      10.21152/1750-9548.13.3.269

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 不発弾海中爆破処理問題の影響評価~数値シミュレーションによる検討~2023

    • Author(s)
      比嘉 吉一,井山 裕文,下嶋 賢
    • Organizer
      2022年度衝撃波シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 実弾殻形状を考慮した地表面爆発問題のモデル化と数値シミュレーション2023

    • Author(s)
      上原 達也,比嘉 吉一,井山 裕文
    • Organizer
      2022年度衝撃波シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 計算力学的アプローチによる不発弾安全化処理技術への貢献2022

    • Author(s)
      比嘉吉一・井山裕文
    • Organizer
      熊本高専メガミーティング2022
    • Related Report
      2021 Research-status Report
  • [Presentation] 海中爆発問題の数値シミュレーション-水深の違いが一次飛散物の運動に及ぼす影響について-2022

    • Author(s)
      比嘉吉一
    • Organizer
      第4回衝撃波応用技術研究会
    • Related Report
      2021 Research-status Report
  • [Presentation] 地表面爆発問題の大規模数値シミュレーション2021

    • Author(s)
      上原達也・比嘉吉一
    • Organizer
      令和3年度琉大工学部・沖縄高専学生研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] 弾殻破片形状を考慮した一次飛散物の弾道シミュレーション2021

    • Author(s)
      内間零斗・比嘉吉一
    • Organizer
      令和3年度琉大工学部・沖縄高専学生研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] 不発弾海中爆破問題のモデル化と数値シミュレーション2021

    • Author(s)
      稲嶺奏人・比嘉吉一
    • Organizer
      令和3年度琉大工学部・沖縄高専学生研究発表会
    • Related Report
      2021 Research-status Report
  • [Presentation] Computational Modeling and Simulation for Undersea Explosive Ordnance Disposal Problem2020

    • Author(s)
      Yoshikazu HIGA, Hirofumi IYAMA, Ken SHIMOJIMA and Shigeru ITOH
    • Organizer
      Yellow Sea Rim Workshop on Explosion, Combusion and other Energetic Phenomena for Various Environmental Issues (YSR2020)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Design of Small Experimental Vessel for Visualizing of Underwater Shock Wave2020

    • Author(s)
      Takafumi NISHIBASHI, Hirofumi IYAMA and Yoshikazu HIGA
    • Organizer
      Yellow Sea Rim Workshop on Explosion, Combusion and other Energetic Phenomena for Various Environmental Issues (YSR2020)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 海中不発弾処理問題に関する数値シミュレーション2020

    • Author(s)
      比嘉 吉一,井山 裕文,下嶋 賢
    • Organizer
      日本機械学会九州支部第73期総会・講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] SPH computation for soil surface explosion problem - the effect of different soil characteristics on a fragment behavior -2019

    • Author(s)
      Yoshikazu HIGA, Hirofumi IYAMA, Ken SHIMOJIMA, Osamu HIGA and Shigeru ITOH
    • Organizer
      2019 International Conference on Design, Mechanical and Electrical Engineering (DMEE 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 海中爆破処理問題のモデル化と数値シミュレーション2019

    • Author(s)
      比嘉 吉一,井山 裕文,下嶋 賢,伊東 繁
    • Organizer
      日本機械学会九州支部沖縄講演会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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