地すべりを反映する地下水,微生物,粘土の特徴(地盤工学会・技術者交流特別セッション)  [in Japanese] Groundwater, Microbial Mats and Clays Reflect the Landslide Areas(Special Session of the Japanese Geotechnical Society)  [in Japanese]

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Author(s)

Abstract

The colorful microbial mats formed and caused stoppage in all drainage pipes at several landslide areas in Niigata Prefecture. The water catchments worked well for a short period such as within three years after the construction. In this study, samples from the damaged areas showing reddish brown microbial mats with iron bacteria, and green microbial mats with diatoms were observed by optical and electron microscopy, XRF and XRD analyses. The green microbial mats were more remarkable in areas mainly containing smectite clays versus sandstone areas rich in ferrihydrite. The green microbial mats formed in areas where the concentration of dissolved oxygen (DO) was more than 8mg/L, and the oxidation-reduction potential (Eh) was more than +300mV. On the other hand, the reddish-brown microbial mats formed in areas where the DO was less than 6.2mg/L, and Eh was less than +300mV. The reddish-brown microbial mats consisted of ferrihydrite formed by iron oxidizing bacteria at the outlets of the drainage pipes. In landslide areas, we pointed out the necessity of maintenance based on groundwater, microorganisms and geological features which contribute to the spread of clays. We propose two methods to prevent the formation of biomats in landslide fields, such as connected pipes and different materials used for drainage pipes.

Journal

  • Journal of the Clay Science Society of Japan (in Japanese)

    Journal of the Clay Science Society of Japan (in Japanese) 47(3), 168-177, 2008

    The Clay Science Society of Japan

References:  22

Cited by:  1

Codes

  • NII Article ID (NAID)
    110006990311
  • NII NACSIS-CAT ID (NCID)
    AN00199972
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0470-6455
  • NDL Article ID
    9715242
  • NDL Source Classification
    ZM46(科学技術--地球科学--岩石・鉱物・鉱床)
  • NDL Call No.
    Z17-117
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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