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Full-scale avalanche experiments at Ryggfonn, Norway and studies on the dynamics of powder-snow avalanches

Research Project

Project/Area Number 02044005
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionInstitute of Low Temperature Science, Hokkaido University

Principal Investigator

MAENO Norikazu  Professor, Inst, of Low Temp. Sci., Hokkaido Univ., 低温科学研究所, 教授 (50001657)

Co-Investigator(Kenkyū-buntansha) LIED Karstein  Sec. Directer, Norwegian Geotechnical Institute, 雪崩調査部(ノルウェー), 部長
NOREM Harald  Res. Fell., Norwegian Geotechnical Institute, 雪崩調査部(ノルウェー), 主任研究員
NOHGUCHI Yasuaki  Res. Fell., National Res. Center for Disaster Prevention, 長岡雪氷防災研究所, 主任研究官
IIDA Hajime  Res. Fell. Kurobe Science Museum, 学芸員
SATO Atsushi  Res. Fell., National Res. Center for Disaster Prevention, 新庄雪氷防災研究所, 主任研究官
ABE Osamu  Res. Fell., National Res. Center for Disaster Prevention, 新庄雪氷防災研究所雪氷防災第一研究室, 研究員
TERADA Hideki  Res. Fell., Public Works Res. Inst., Min. of Construction, 砂防部急傾斜地崩壊研究室, 主任研究員
FUJISAWA Kazunori  Res. Fell., Public Works Res. Inst., Min. of Construction, 砂防部急傾斜地崩壊研究室, 研究員
LARSEN Jan Otto  Res. Fell., Norwegian Geotechnical Institute, 雪崩調査部(ノルウェー), 主任研究員
BAKKENHOI St  地球工学研究所, 雪崩調査部(ノルウェー), 主任研究員
NAKAMURA Yoshimitsu  Res. Fell., Public Works Res. Inst., Min. of Construction, 砂防部急傾斜地崩壊研究室, 室長
FUKUZAWA Takuya  Res. Ass., Inst. Low Temp. Sci., Hokkaido Univ., 低温科学研究所, 助手 (90238460)
NISHIMURA Kouichi  Res. Ass., Inst. Low Temp. Sci., Hokkaido Univ., 低温科学研究所, 助手 (10180639)
SHIMIZU Osamu  Res. Ass., Fac. of Agriculture, Hokkaido Univ., 農学部, 助手 (20178966)
NAKAGAWA Masami  Res. Ass., Tohoku University, 工学部, 助手 (80198043)
KAWADA Kunio  Res. Ass., Toyama University, 理学部, 助手 (20019003)
NARITA Hideki  Lecturer, Inst. Low Temp. Sci., Hokkaido Univ., 低温科学研究所, 講師 (20001662)
IZUMI Kaoru  Ass. Prof., Niigata Univ., 積雪地域災害研究センター, 助教授 (50114997)
KIMURA Ryuji  Ass. Prof. Ocean Res. Inst., Univ. of Tokyo, 海洋研究所, 助教授 (20013576)
AKITAYA Eizi  Professor, Inst, of Low Temp. Sci., Hokkaido Univ., 低温科学研究所, 教授 (20001654)
BAKKEHOI Steinar  Res. Fell., Norwegian Geotechnical Institute
KARSTEIN Lie  ノルウェー地球工学研究所, 雪崩調査部, 部長
HARALD Norem  ノルウェー地球工学研究所, 雪崩調査部, 主任研究員
JAN Otto Lar  ノルウェー地球工学研究所, 雪崩調査部, 主任研究員
STEINAR Bakk  ノルウェー地球工学研究所, 雪崩調査部, 主任研究員
吉松 弘行  建設省土木研究所, 砂防部急傾斜地崩壊研究室, 室長
Project Period (FY) 1990 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 1991: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1990: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsPowder-snow avalanche / avalanche / fluidized snow / avalanche-wind / granular flow model / multi-phase flow / Continuum flow model / Artificial snow avalanche / 人工雪崩実験
Research Abstract

Among two types of snow avalanches the release and dynamic characteristics of wet snow avalanches are rather simple, but those of dry snow avalanches, especially of powder-snow avalanches, are complex and more detailed information is required. The present study was initiated in aiming to make various observations about internal structures and dynamic properties of powder-snow avalanches.
Natural snow avalanches were observed at Shiai-dani in Kurobe Canyon by taking video-films and installing various sensors including impact pressure sensors and ultrasonic anemometer. One of the findings was the record of avalanche winds detected by a ultrasonic anemometer. The avalanche wind was observed to precede the avalanche body.
Snow avalanches were artificially released at Ryggfon site in Norway. So far three avalanches were observed ; in one avalanche the mean running speed was 22 m/s, the volume and maximum depth of the debris were 20, 000 m^3 and 5 m respectively. The observation of size distribution of the constituent snow blocks showed that the larger ones tended to be accumulated at the front part of avalanches.
Laboratory experiments of snow avalanches were also carried out by flowing numerous ice spheres (diameter 2.9 mm) in a 5-m long chute at temperatures from 0 to -30゚C. Measurements of velocities and densities of ice spheres showed significant inhomogeneity in the internal structure vertically as well as horizontally.

Report

(3 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 前野 紀一: "雪粒子と氷粒子の物性" 地学雑誌. 100. 224-233 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOSUGI,K.: "Wind tunnel experiments of snow ripples" Seppyo. 54-1. 1-8 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOSUGI,K.: "Snow ripples and their contribution to the mass transport in drifting snow" Boundary Layer Met.(1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] NAKAGAWA,M.: "Simulations of rapid bimodal granular flows" JUSLDPC 1991. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] NAKAGAWA,M.: "Chute flow experiment of ice spheres" J.Multiphase Flows. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] MAENO, N.: "Physical properties of ice and snow particles" J. Geography. 100. 224-233 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOSUGI, K.: "Wind tunnel experiments of snow ripples" Seppyo. 54-1. 1-8 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] KOSUGI, K.: "Snow ripples and their contribution to mass transport in drifting snow" Boundary Layer Met.(1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] NAKAGAWA, M.: "Simulations of rapid bimodal granular flows" JUSIDPC 1991. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] NAKAGAWA, M.: "Chute flow experiment of ice spheres" J. Multiphase Flows. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 前野 紀一: "雪粒子と氷粒子の物性" 地学雑誌. 100. 224-233 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] KOSUGI,K.: "Wind tunnel experiments of snow ripples" Seppyo. 54-1. 1-8 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] KOSUGI,K.: "Snow ripples and their contribution to the mass transport in drifting snow" Boundary Layer Met.(1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] NAKAGAWA,M.: "Simulations of rapid bimodal granular flows" JUSLDPC 1991. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] NAKAGAWA,M.: "Chute flow experiment of ice spheres" J.Multiphase Flows. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 西村 浩一: "乾雪表層雪崩の内部構造を探る" 雪氷. 52. 113-116 (1990)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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