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2007 Fiscal Year Final Research Report Summary

Elucidation of the warning rainfall criteria against landslide disasters, taking the soil moisture content into consideration

Research Project

Project/Area Number 17380097
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学・森林工学
Research InstitutionKyushu University

Principal Investigator

KUBOTA Tetsuya  Kyushu University, Faculty of Agriculture, Associate Professor (40243381)

Co-Investigator(Kenkyū-buntansha) OTSUKI Kyouichi  Kyushu University, Faculty of Agriculture, Professor (80183763)
Project Period (FY) 2005 – 2007
KeywordsWarning and evacuation / Standard rain / Landslide 4) Debris flow / Indonesia / Indonesia / Nepal / Mexico / インドネシア
Research Abstract

In mountainous forest areas, roads or railroads and local inhabitants sometime suffer from sediment related disasters along torrents. On this point of view, monitoring of the sediment runoff and analysis of its characteristic in a mountainous torrent have carried out, in order to set up the runoff criteria of sediment from the torrent and the local standard rainfall for warning and evacuation. The research is run on a torrent whose geology consists of Paleozoic metamorphic rocks (mainly schist) and whose vegetation consists of mainly Japanese cypress as well as in similar forest slopes in Nuevo Leon Mexico, Sulawesi Indonesia, around Kathmandu Nepal. Soil depth is approximately 50cm in average and permeability is k=10^<-2> 10^<-3> order. Rain, wind speed, soil moisture content, sediment discharge (periodical observation) were monitored and the sediment runoff characteristic obtained by the monitoring and the observation over 3 years.
1) Theoretical Critical Standard of Sudden Sediment R … More unoff based on the Hirano's discharge theory or the Self Organized Criticality Assumption SOC
The soil moisture content along the torrent (riparian area) is not affected by antecedent rainfall according to the field observation, so is the sediment runoff from torrent bed or torrent sides which does not include the runoff triggered by landslides or slope failures.
The accuracy of this method contemplated by detective ratio or critical success index with the present data is high (almost 100%).
2) Theoretical Critical Standard based on the Elementary Catastrophe Theory (ETC)
Providing that the Elementary Catastrophe Theory (ETC) can be applied to this critical line, the critical line is described by next equation adopting the wedge type catastrophe theory. However, it has the cross point with lateral axis i.e. Pd=0. It is impossible for rain to take this combination of the Pa and Pi. Therefore, the ETC is not suitable in this case.
Since the sediment runoff from torrent bed or torrent sides (which does not include the runoff triggered by landslides or slope failures) is not affected by antecedent rainfall based on the field observation, formulas derived in this study is rather simple and handy than the other methods. Less

  • Research Products

    (12 results)

All 2007 2006 Other

All Journal Article (4 results) (of which Peer Reviewed: 1 results) Presentation (4 results) Remarks (4 results)

  • [Journal Article] メキシコ東部における地すべり・土砂災害警戒避難基準雨量の検討事例2007

    • Author(s)
      久保田 哲也、イスラエル・カントゥ・シルバ、大槻 恭一
    • Journal Title

      地すべり学会誌 43(6)

      Pages: 53-59

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Diagnosis of synoptic meteorological coidition of seddiment related disast ers in western Japan2007

    • Author(s)
      Kubota, T
    • Journal Title

      Proc.of the Japan Korea Taiwan Symposium of sediment-related disasters, Japan Society of Erosion Control Engineering

      Pages: 49-61

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Elucidation of the warning rainfall criteria against landslide disasters in Kyushu and Nuevo Leon Mexico, taking the soil moisture content into consideration2007

    • Author(s)
      Kubota, T., Otsuki, K., Israel, Silva, C
    • Journal Title

      Journal of Japan Landslide Society 43-6

      Pages: 53-59

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Diagnosis of synoptic meteorological condition of sediment related disasters in western Japan2007

    • Author(s)
      Kubota, T
    • Journal Title

      Proc. of the Japan Korea Taiwan, Symposium of sediment-related disasters Japan Society of Erosion Control Engineering

      Pages: 49-61

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 土砂流出強度による山地災害警戒避難基準雨量の解析-九州北部・メキシコ東部・インドネシアスラウェシの比較2007

    • Author(s)
      久保田 哲也、Hasnawir、Israel Cantu Silva、大村 寛
    • Organizer
      平成19年度日本自然災害学会学術講演会講演集
    • Place of Presentation
      札幌市(北海道大学)
    • Year and Date
      2007-09-25
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Hasnawir, Elucidation of the warning rainfall criteria based on the theory of sediment runoff intensity2007

    • Author(s)
      Kubota, T
    • Organizer
      Annual Congress of Japan Society of Natural Disaster
    • Place of Presentation
      Sapporo
    • Year and Date
      2007-09-25
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Landslide and sediment runoff in Chipinque Ecological Park induced by anthropogenic impacts2006

    • Author(s)
      Kubota, T., Otsuki, K
    • Organizer
      Annual Congress of Japan Landslide Society
    • Place of Presentation
      Tottori
    • Year and Date
      2006-08-31
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] Elucidation of the warning rainfall criteria against landslide disasters, taking the soil moisture content into consideration2006

    • Author(s)
      Kubota, T., Otsuki, K
    • Organizer
      Annual Congress of Japan Society of Erosion Control Engineering
    • Place of Presentation
      Wakayama
    • Year and Date
      2006-05-24
    • Description
      「研究成果報告書概要(欧文)」より
  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://ffpsc.agr.kyushu-u.ac.jp/Indonesia07.htm

  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://ffpsc.agr.kyushu-u.ac.jp/control/Nepal07.htm

  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://ffpsc.agr.kyushu-u.ac.jp/control/Mexico07.htm

  • [Remarks] 「研究成果報告書概要(和文)」より

    • URL

      http://www.ee.e-mansion.com/~tkubota/MonterreyDisas.htm

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Published: 2010-02-04  

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