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1993 Fiscal Year Final Research Report Summary

A synthetic study on the forecast of occurrence of large-scale sediment disasters and the counter plan on the suburbs of the Mt.Unzn.

Research Project

Project/Area Number 04302056
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 機械材料工学
Research InstitutionTokyo University, (1993)
Tokyo University of Agriculture (1992)

Principal Investigator

YAMAGUCHI Isao  Tokyo Univ.Dep.Agriculture.Prof., 農学部, 名誉教授 (30011836)

Co-Investigator(Kenkyū-buntansha) IWAO Y  Saga Univ.Dep.Civil Emg.Prof., 理工学部, 教授 (80039289)
ONIZUKA K  Saga Univ.Dep.Civil Eng.Prof., 理工学部, 教授 (20037948)
SHIMOKAWA K  Kagoshima Univ.Dep.Agriculture, Prof., 農学部, 教授 (60041670)
OGAWA S  Ehime Univ.Dep.Agriculture, Prof., 農学部, 教授 (30037973)
KISHIHARA N  Saga Univ.Dep.Civil.Eng.Prof., 理工学部, 教授 (40003769)
Project Period (FY) 1992 – 1993
KeywordsDebris flow / Electric prospecting / Radioactivity survey / Large-scale collapse / Pore water pressure / Groundwater analysis / G.P.S. / Rheology
Research Abstract

The objective of this study is an analysis of the large-scale collapse at Mt.May-uyama and the debris flows from deposit of volcanic ash and pyroclastic flow on the erupting Mt.Unzen-Fugenndake. Since the large-scale collapses are consid-cred to be the causes of unusual variations of hydrothermal water and ground water and the influence of earthquakes, we analyzed and observed as follows ; hazard area of the large-scale collapses was zoned from the geological profile and fault lines estimated by morphological analysis, radioactivity survey and electric prosoecting. Observations have been made using extensometer, strain meter, inclinometerand accelerometer at Mt.Mayu-yama.
We also surveyed the sign of collapse and the pore water pressure including indoor investigations. The results were used in mapping of hazard collapse areas with calculations of critical maximum acceleration and pore water pressure. Relation between volcanism of Mt.Unzen and activities of graben zone at Unzen were also investigated with continuous observations using G.P.S.. We are obser-ving spring water temperature, groudwater level, groudwater and geological electric current which were concerned with carthquakes and unusual variations of ground water quality in order to investigate the sign of large-scale collapse. Continous analysis of condition of gully on the deposit of volcanic ash and pyroclastic flow indicates the relation between gully and scale of the debris flows. The hazard map of flooding was made using analysis of increasing mudflow and energy of flow by rhecology models of volcanic ash.
The results of this study provide important data for prevention of secondary disasters caused by volcanic activities.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 岸原信義ほか: "降雨と地下水の応答関係に関する検討" 平成4年度土木学会西部研究発表会講演概要集. 294-295 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Kishihara: "Study of the Sedimont Yield of the NO.3 Stream on Mt.Mayuyama in the Unzen Area." Bull,of I.T.A. Kyushu University. 16. 65-79 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岸原信義ほか: "水文諸量の時系列解析手法に関する研究" 水文・水資源学会誌. 7. 30-35 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 鬼塚,克忠ほか: "眉山砂の力学的特性と斜面安定計算" 平成4年度土木学会西部研究発表会講演概要集. 10-13 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岩尾雄四郎: "雲仙眉山地域の地温と熱流量調査" 平成4年度土木学会西部研究発表会講演概要集. 552-553 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 岩尾雄四郎: "雲仙眉山地域の地形解析と危険地の予測" 平成4年度土木学会西部研究発表会講演概要集. 550-551 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Ooya, N.Kishihara: "Study on the relationship between rainfall and ground-water level in Shimabara Areas." Proceedings of Annual Conference of the JSCE,Seibu-branch. 294-295 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Watahiki ・ N.Kishihara et al.: "Study of the Sediment Yield of the No.3 Stream on Mt.Mayuyama in the Unzen Area." Bull.of I.T.A Kyusyu University. Vol.16. 65-79 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Enokida ・ N.Kishihara et al.: "Study on Time Series Analysis of Some Hydrological Variables-1." Journal of Japan Society of Hydrology & Water Resources. Vol.7,2. 30-35 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Onitsuka K., Yoshitake S.and Murao T.: "Mechanical Characteristics of Mayuyama Sand and Its Stability Analysis (No.2)." Proceedimgs of Annual Conference of the JSCE,Seibu-branch. 10-13 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Iwao: "Geothermal Survey at the Mayuyama, Unzen." Proceedings of Annual Conference of the JSCE,Seibu-branchi. 552-553 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Iwao: "Geomorphological Analysis and Hazard Prediction at the Mayuyama, Unzen" Proceedings of Annual Conference of the JSCE,Seibu-branchi. 550-551 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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