OCEANIC-ENVIROMENTAL ANALYSIS BY MAINS OF ECHO SONDER AND SEDIMENTS, OFF KUMAMOTO CITY

DOI

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Other Title
  • 音響および底質特性に基づく熊本市沖有明海の海域環境の解析

Abstract

We investigated the geography by the echo sounder and the sediment surface with the side scanning sonar, and collected the sediment cores at three points off Kumamoto City, to environmental reconstruction of the history of oceanic conditions since the 1950's, and to evaluation of the influence of sediments on marine organism.<BR>The sandy bank off Yokoshima has been lost the function as the habitat of marine organism, because new sediments are not deposit on the slop and bottom in the dredged holes, and the mats ofModiolus comptusare not distributes on the surface of the bank. Muddy sediments in the Kumamoto area deposited after the latter half of 1970's are thick (ca. 80cm) off Midorikawa River, and became thin toward the north (less than 1cm off Kikuchigawa River). The limit of diffusion in mud exists off Yokoshima. The rapid increase of the haul ofRuditapes philippinarumwas closely related with the expansion of the sediments mixed coarse grains such as the shell fragments, sand, and gravel. In addition, the individuals of the clams increased in the sediments with less than 60% of mud in core sample.

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Details 詳細情報について

  • CRID
    1390282680181175936
  • NII Article ID
    130003950890
  • DOI
    10.2208/prooe.24.639
  • ISSN
    18848265
    09127348
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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