Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
Volume 52, Issue 4
Displaying 1-3 of 3 articles from this issue
Original Article
  • Kenji MATSUMOTO, Toshinori OWATARI, Hiroyuki OHNO, Tetsuya MIYAHARA, T ...
    2011Volume 52Issue 4 Pages 128-136
    Published: 2011
    Released on J-STAGE: March 31, 2013
    JOURNAL FREE ACCESS
     Most of offshore constructions use the natural ground (alluvial clay layer) as a landfill bottom liner. The Ministerial Ordinance Determining Engineering Standards Pertaining to Final Disposal Site for Municipal Solid Wastes and Final Disposal Site for Industrial Wastes (Ordinance No.1 of the General Administrative Agency of the Cabinet and the Ministry of Health and Welfare, 14th March, 1977) provides that the landfill bottom liner must have suitable liner structure.
     Therefore, knowing the settling phenomena of landfilled wastes is very important in case of analyzing influences of offshore constructions to the surrounding environment. However, little research had been carried out to investigate the effect of waste dumping on the landfill bottom liner so far, and it's not so easy to grasp actual phenomena. It is the major reason that the presence of suspended solids in water interferes the observation of such phenomena. So, we have tried to know the settling phenomena of landfilled wastes by using sonar exploration (i.e., side imaging sonar).
     As a result, images obtained by the sonar exploration enabled to know the settling phenomena of a swarm of solid particles, then the possibility to know the change of seabed shape was revealed. In conclusion, the observation by using the sonar exploration can be a useful method in the management of waste dumping for offshore constructions.
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