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An investigation of sea spray icing by NMR imaging

Research Project

Project/Area Number 13680541
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Natural disaster science
Research InstitutionHokkaido University of Education

Principal Investigator

OZEKI Toshihiro  Hokkaido University of Education, Faculty of Education, Iwamizawa Campus, Associate Professor, 教育学部・岩見沢校, 助教授 (20301947)

Co-Investigator(Kenkyū-buntansha) NISHIMURA Koichi  National Research Institute, Snow and Ice Research Group, Senior Researcher, 長岡雪氷防災研究所, 主任研究員 (10180639)
KOSE Katsumi  University of Tsukuba, Institute of Applied Physics, Professor, 物理工学系, 教授 (60186690)
NOJO Ayumu  Hokkaido University of Education, Faculty of Education, Iwamizawa Campus, Associate Professor, 教育学部・岩見沢校, 助教授 (20311524)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2003: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsMagnetic Resonance / Sea Spray Icing / Imaging / Three Dimensional Structure / MRI / Spongy Ice / Ship Superstructure Icing / Lighthouse
Research Abstract

Reduced visibility due to sea-spray ice accretion is a big problem for the operation of lighthouses in northern harbors. Spray icing also causes marine disasters for trawlers and vessels in cold sea areas. Brine pockets, which are trapped in a spray ice matrix during ice growth from sea spray, are structural feature of the sea-spray icing. The salt entrapment and drainage of the brine controls the growth rate and physical properties of spray ice. To address this problem we designed an MR microscopy system to visualize the drainage channels in sea spray icing.
The sea spray icing samples came from ice accretion on a lighthouse on the west coast of Hokkaido, Japan. Because the brine in the spray ice had already drained out, we used a suction pump to fill the air gaps in the drainage channels with dodecane. The signal from dodecane doped with iron acetylacetonate was sufficient to detect the location of the drainage channels.
3-D microscopic images were obtained with an NMR imaging system. The imaging sequence used 3-D gradient echoes. To obtain one 3-D image, 0.5 -1 h was needed ; thus, we used a specimen-cooling system to maintain the sample at a constant temperature. The chamber had a double-pipe cylinder through which flowed cold air, and the temperature of the sample holder was controlled by adjusting the volume of cold air flow.
We used MIP and 3-D rendering to visualize the drainage channels, and then we recognized that sea spray icing has a developed network structure of drainage channels. This experiment shows that MR microscopy can be used to image the structure of drainage channels in sea spray ice.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] 尾関俊浩 他4名: "NMR imaging of drainage channels in sea spray icing"Abstracts of 7th International conference on Magnetic Resonance Microscopy. 76 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 尾関俊浩 他6名: "核磁気共鳴影像法によるしもざらめ雪の可視化実験"寒地技術論文・報告集. 17. 104-109 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 尾関俊浩 他4名: "海水飛沫着氷の再現実験"寒地技術論文・報告集. 18. 308-311 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 尾関俊浩 他5名: "Three-dimensional snow images by NR Microscopy"Magnetic Resonance Imaging. 21. 351-354 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 尾関俊浩 他4名: "MRIによる海水飛沫着氷内のブラインチャンネルの可視化"寒地技術論文・報告集. 19. 239-243 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 尾関俊浩 他5名: "MR microscopy of snowpack structures"Cold Regions Science and Technology. 37. 386-391 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ozeki, 5 others: "NMR imaging of snowpack structures."Abstracts of 6th International Conference on Magnetic Resonance Microscopy. 38. (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ozeki, 6 others: "Visualization of depth-hoar layers using NMR Micro-imaging."Proceedings of 2001 Cold Region Technology Conference. 17. 104-109 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ozeki, 4 others: "An experimental study of spray icing formation."Proceedings of 2002 Cold Region Technology Conference. 18. 308-311 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ozeki, 5 others: "Three-dimensional snow images by MR microscopy."Magnetic Resonance Imaging. 21. 351-354 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ozeki, 4 others: "NMR Imaging of brine-drainage channels in sea spray icing."Proceedings of 2003 Cold Region Technology Conference. 19. 239-243 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ozeki, 5 others: "Three-dimensional MR microscopy of snowpack structures."Cold Regions Science and Technology. 37. 386-391 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ozeki, 4 others: "NMR imaging of drainage channels icing."Abstracts of 7th International Conference on Magnetic Resonance Microscopy. 76. (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 尾関俊浩 他5名: "Three-dimensional snow images by MR Microscopy"Magnetic Resonance Imaging. 21. 351-354 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 尾関俊浩 他4名: "MRIによる海水飛沫着氷内のブラインチャネルの可視化"寒地技術論文・報告集. 19. 239-243 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 尾関俊浩 他5名: "MR microscopy of snowpack structures"Cold Regions Science and Technology. 37. 386-391 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 尾関俊浩 他4名: "海水飛沫着氷の再現実験"寒地技術論文・報告集. 18. 308-311 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 尾関俊浩 他5名: "Three-dimensional MR microscopy of snowpack structures"International Snow Science Workshop 2002 Proceedings. 380-383 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 尾関俊浩 他6名: "核磁気共鳴映像法によるしもざらめ雪の可視化実験"寒地技術論文・報告集. 17. 104-109 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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