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2007 Fiscal Year Final Research Report Summary

Studies on the Occurrence of Hypoxic Water in the Interior Parts of the Ariake Sea and its Preventive Measures

Research Project

Project/Area Number 17380146
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionSaga University

Principal Investigator

SEGUCHI Masahiro  Saga University, Faculty of Agriculture, Professor (20093974)

Co-Investigator(Kenkyū-buntansha) KATO Fumio  Saga University, Faculty of Agriculture, Professor (90109223)
KANDA Kohzo  Saga University, Faculty of Agriculture, Professor (00117095)
TABATA Masaaki  Saga University, Faculty of Science and Engineering, Professor (40039285)
Project Period (FY) 2005 – 2007
KeywordsAriake Sea / hypoxic water / dissolved oxygen / pycnocline / vertical diffusion coefficient / inorganic nitrogen / prevention block / upwelling current
Research Abstract

The actual conditions of hypoxic water which occurred in the western interior parts of the Ariake Sea were clarified based on the data of dissolved oxygen concentration (DO), velocity (V), salinity (S) and water temperature (T) at the 30 cm height from the sea-bottom measured hourly in summer of 2005-2007 using two multi-items measures with DoPa communication system. The relationships between the occurrence of hypoxic water and vertical structure of density calculated from Sand Talong the measurement lines in longitudinal and lateral directions set in this sea area were also grasped, and it was shown that the density pycnocline were always formed at the time of the outbreaks of hypoxic water and the vertical diffusion coefficient decreased rapidly near the density pycnocline. Moreover the consumption rates of DO in the bottom layer depended largely on the amount of suspended organic mutter there. On the other hand, the analysis results of DO data during 34 years by a two-layer box model indicated that the vertical diffusion coefficients decreased rapidly, and on the contrary, the consumption rate increased largely as the density stratification parameter rose greatly in summer. The occurrence of hypoxic water in summer was due to the fact that with the formation of the density pycnocline, the vertical diffusion flux of DO from the surface layer to the bottom one in the sea-water column became more than the consumption of DO in the bottom layer. It was also presented experimentally that the installation of a triangle block with special shape on the sea-bottom was effective for prevention of the occurrence of hypoxic water in the study sea area

  • Research Products

    (11 results)

All 2008 2007 Other

All Journal Article (6 results) (of which Peer Reviewed: 3 results) Presentation (4 results) Remarks (1 results)

  • [Journal Article] ボックスモデルによる有明海奥部西岸域における貧酸素水塊発生機構の検討2008

    • Author(s)
      郡山 益実・瀬口 昌洋・石谷 哲寛
    • Journal Title

      農業農村工学会論文集

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Study on the Occurrence Mechanism of Hypoxic Water in the Interior Western Parts of the Ariake Sea Using the Box Model2008

    • Author(s)
      Masumi, Koriyama, Masahiro, Seguchi, Tetsuhiro, Ishitani
    • Journal Title

      Tracsactions of the Japanese Society of Irrigation, Drainage and Rural Engineering (in press)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 有明海奥部干潟域における脱窒菌群の生息分布と底質環境について2007

    • Author(s)
      瀬口 昌洋・郡山 益実・古賀 あかね・野田 美幸
    • Journal Title

      海岸工学論文集 54

      Pages: 1126-1130

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Distribution of Heavy Metals I Interstitial Water and Sediments at Different Sites in Ariake bay,Japan2007

    • Author(s)
      M. Tabata, A. Ghaffar, Y. Eto, J. Nishimoto, K. Yamamoto
    • Journal Title

      E-Water(Europeai Water Association) 5

      Pages: 1-24

    • Description
      「研究成果報告書概要(和文)」より
    • Peer Reviewed
  • [Journal Article] Relations between Habitat Distribution of Denitrifying Bacteria and Sediment Environment in the Tidal Flat of the Interior Parts of the Ariake Sea2007

    • Author(s)
      Masahiro, Seguchi, Masumi, Koriyama, Akane, Koga, Miyuki, Noda
    • Journal Title

      Annual Journal of Coastal Engineering 54

      Pages: 1126-1130

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Distribution of Heavy Metals in Interstitial Waters and Sediments at Different Sites in Ariake Bay2007

    • Author(s)
      Masaaki, Tabata, Abdul, Ghaffar, Yui, Eto, Jun, Nishimoto, Koichi, Yamamoto
    • Journal Title

      E-Water

      Pages: 1-23

    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 有明海奥部干潟域における脱窒菌群の生息分布と底質環境について2007

    • Author(s)
      瀬口 昌洋・郡山 益実・古賀 あかね・野田 美幸
    • Organizer
      第54回海岸工学講演会
    • Place of Presentation
      宮崎市
    • Year and Date
      2007-11-08
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Relations between Habitat Distribution of Denitrifying Bacteria and Sediment Environment in the Tidal Flat of the Interior Parts of the Ariake Sea2007

    • Author(s)
      Masahiro, Seguchi, Masumi, Koriyama, Akane, Koga, Miyuki, Noda
    • Organizer
      Annual Conference of Coastal Engineering
    • Place of Presentation
      Miyazaki
    • Year and Date
      2007-11-08
    • Description
      「研究成果報告書概要(欧文)」より
  • [Presentation] 有明海観測タワーに基づく貧酸素水塊発生時の沿岸海洋構造の検討2007

    • Author(s)
      瀬口 昌洋・郡山 益実・石谷 哲寛
    • Organizer
      平成19年度農業土木学会大会講演会
    • Place of Presentation
      松江市(島根大学)
    • Year and Date
      2007-08-30
    • Description
      「研究成果報告書概要(和文)」より
  • [Presentation] Studies on the Coastal Marine Structure at the Occurrence of Hypoxic Water Using the Data obtained by Ariake Observation Tower2007

    • Author(s)
      Masahiro, Seguchi, Masumi, Koriyama, Tetuhiro, Ishitani
    • Organizer
      Annual Conference of the Japanese Society of Irrigation, Drainage and Rural Engineering
    • Place of Presentation
      Matue
    • Year and Date
      2007-08-30
    • 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://www.ariake.civil.saga-u.ac.jp/sitemap.html

URL: 

Published: 2010-02-04  

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