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NMR Imaging of 3-D Snowpack Structures

Research Project

Project/Area Number 11640423
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Meteorology/Physical oceanography/Hydrology
Research InstitutionHokkaido University

Principal Investigator

NARITA Hideki (2000-2001)  Hokkaido Univ., Inst.of Low Temp. Sci., Asso. Prof., 低温科学研究所, 助教授 (20001662)

尾関 俊浩 (1999)  北海道大学, 大学院・工学研究科, 助手 (20301947)

Co-Investigator(Kenkyū-buntansha) KOSE Katsumi  University of Tsukuba, Inst. Of Applied Physics, Asso. Prof., 物理工学系, 助教授 (60186690)
SONE Toshio  Hokkaido Univ., Inst. of Low Temp. Sci., Assi. Prof., 低温科学研究所, 助手 (10222077)
YAMADA Tomomi  Hokkaido Univ., Inst. of Low Temp. Sci, Asso. Prof., 低温科学研究所, 助教授 (50002100)
HACHIKUBO Akihiro  Kitami Insututute of Technology, Dep. of Civil Eng., Asso. Prof., 未利用エネルギー研究センター, 助教授 (50312450)
TAGUCHI Yoshihiro  Chuo Univ., Fac. of Sci. and Eng., Asso. Prof., 理工学部, 助教授 (30206932)
成田 英器  北海道大学, 低温科学研究所, 助教授 (20001662)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1999: ¥2,000,000 (Direct Cost: ¥2,000,000)
KeywordsNMR imaging / Snow pack / 3D-Visualization / 3D structures / Ice spheres / Depth-hoar crystals / しもざらめ雪 / しまり雪
Research Abstract

Microstructure of the snow pack should be better understood because it affects the mechanical and physical properties of snow. Thin sections and plane-surface sections are currently used to investigate. However, they give only two-dimensional information ; therefore, a large number of operations are necessary to reconstruct the three-dimensional structure. In this study we have developed a NMR imaging technique to visualize and quantify the 3D structure of snow pack.
Because the NMR signal from the ice was very weak, the air spaces in the snow were filled with dodecane doped with iron acetylaetonate C12H26, which has a good infiltration property and a low freezing point (about -12℃). Thus, the NMR images the space occupied with dodecane instead of ice particles. The 3D images were obtained with a homebuilt NMR imaging system using a 4.74-T superconducting magnet. The result of test imaging of dodecane showed 0.5 to 2 hours were needed to obtain the one 3D image, and hence we developed a specimen cooling system to keep the temperature below 0℃. This system has a double-pipe cylinder made of acrylic plastic with outer diameter of 40 mm and inner diameter of 20 mm through which cold air was passed. Two types of snow were prepared : ice spheres of about 3-mm diameter and depth-hoar crystals. In particular, because the ice spheres are sufficiently large and uniformly sized, they were ideal for test imaging. 3D microscopic images were obtained successfully ; the image matrix was 128^3 and voxel size was 0.2 mm^3. We could recognize the 3D structure of the packed ice spheres clearly by viewing from various angles and cross sections.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 尾関俊浩 他: "NMR映像法による積雪の可視化に関する一実験"寒地技術論文・報告集. 16. 132-136 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 尾関俊浩 他: "MRIによる積雪3次元構造の可視化"北海道の雪氷. 19. 18-20 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Ozek et al.: "NMR Imaging of Snowpack Structures"Abstracts of 6th International Conference on Magnetic Resonance Microscopy. 38-38 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Ozek et al.: "NMR Imaging of Snow"Proceedings of International Snow Science Workshop 2000. 402-406 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 尾関俊浩 他: "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)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Ozeki et al.: "An investigation of NMR Imaging of Snow"Proceedings of Cold Region Technology Conference. 16, (in Japanese). 132-136 (2000)

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

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Ozeki et al.: "NMR Imaging of 3-D Snowpack Structures"Hokkaido-no-Seppyo. 19, (in Japanese). 18-20 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Ozeki et al.: "NMR Imaging of Snow"Proceedings of International Snow Science Workshop 2000. 402-406 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Ozeki et al.: "NMR Imaging of Snowpack Structures"Abstracts of 6th International Coference on Magnetic Resonance Microscopy. 38 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Ozeki et al.: "NMR Imaging of Snow"Proceedings of International Snow Science Workshop 2000. (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 尾関俊浩 他: "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
  • [Publications] 尾関俊浩 他: "NMR映像法による積雪の可視化に関する一実験."寒地技術論文・報告集. 16. 132-136 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 尾関俊浩 他: "MRIによる積雪3次元構造の可視化."北海道の雪氷. 19. 18-20 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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