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Improvement of bottom hypoxia in estuarine waters by vertical circulation using a Solar Riser

Research Project

Project/Area Number 17580160
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field General fisheries
Research InstitutionTokyo University of Marine Science and Technology

Principal Investigator

ISHIMARU Takashi  Tokyo University of Marine Science and Technology, Department of Marine Science, Professor, 海洋科学部, 教授 (90114371)

Co-Investigator(Kenkyū-buntansha) TAKAMASA Tomoji  Tokyo University of Marine Science and Technology, Department of Marine Technology, Professor, 海洋工学部, 教授 (20134851)
HADUKU Tatsuya  Tokyo University of Marine Science and Technology, Department of Marine Technology, Associate professor, 海洋工学部, 助教授 (60334554)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥2,700,000 (Direct Cost: ¥2,700,000)
KeywordsHypoxia / Dissolved Oxygen / Vertical circulation / Water quality / 鉛直混合
Research Abstract

The purpose of this study is to develop a system for improving bottom hypoxia in estuarine waters by generating vertical circulations at low energy cost. At the beginning of our study, we designed a riser tube to drive upwelling circulation by heating the water at the bottom by using solar energy at the dock basin of Shinagawa campus, the Tokyo University of Marine Science and Technology. We made a simulation based on the observations of temperature, salinity, dissolved oxygen (DO) in the dock during the first year of our study. We found that the difference between surface and bottom water density (8 kg m^3 in average and more than 17 kg m^3 after heavy rain) was much grater than that we expected and therefore, large energy would be required for driving vertical circulations. So, we changed our plan to make a system to pump down the surface seawater through a tube to near bottom area for supplying high DO water to the bottom to improve hypoxia in neighboring water of the system. We made several improvements in the system and monitored the anomaly of salinity distributions around the system. We finally attached a manifold with many small holes to the outlet of the tube to mix the surface water to near bottom water to increase high density, with high DO. The mixed water was found to retain around the system. However, as it was winter when we completed the final design and bottom hypoxia was already dissolved. So, we are confirming the validity of the system in the following summer.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (12 results)

All 2006 2005

All Journal Article (12 results)

  • [Journal Article] Metabolic balance of gross primary production and community respiration in Sagami Bay, Japan.2006

    • Author(s)
      Hashimoto, S
    • Journal Title

      Marine Ecol. Prog. Ser 321

      Pages: 30-41

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] One-dimensional drift-flux model at reduced gravity conditions.2006

    • Author(s)
      Hibiki, T.
    • Journal Title

      AIAA Journal 44(7)

      Pages: 1635-1642

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Metabolic balance of gross primary production and community respiration in Sagami Bay, Japan.2006

    • Author(s)
      Hashimoto, S., N.Horimoto, T.Ishimaru, T.Saino
    • Journal Title

      Marine Ecol.Prog.Ser 321

      Pages: 30-41

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] One-dimensional drift-flux model at reduced gravity conditions.2006

    • Author(s)
      Hibiki, T., T.Takamasa, M.Ishi, K.S.Gabriel
    • Journal Title

      AIAA Journal 44 (7)

      Pages: 1635-1642

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relationship between net and gross primary production in the Sagami Bay, Japan.2005

    • Author(s)
      Hashimoto, S
    • Journal Title

      Limnol. Oceanogr. 50

      Pages: 1830-1835

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of Testosterone on the calanoid copepod, Acartia omorii Bradford.2005

    • Author(s)
      Khaled. H.
    • Journal Title

      La Mer 43

      Pages: 69-73

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Reduction of active nucleation site density under gamma ray irradiation.2005

    • Author(s)
      Imai, Y.
    • Journal Title

      Thermal Science & Engineering 13(5)

      Pages: 17-23

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Prediction method of critical power by film flow rate measurement and subchannel analysis.2005

    • Author(s)
      Akiba, M.
    • Journal Title

      Heat Transfer-Asian Research 34(5)

      Pages: 309-323

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relationship between net and gross primary production in the Sagami Bay, Japan.2005

    • Author(s)
      Hashimoto, S., N.Horimoto, Y.Yamaguchi, T.Ishimaru, T.Saino
    • Journal Title

      Limnol.Oceanogr 50

      Pages: 1830-1835

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Effects of Testosterone on the Calanoid Copepod, Acartia omorl Bradford.2005

    • Author(s)
      Khaled.H., T.Omura, S.Takeda, T.Ishimaru
    • Journal Title

      La Mer 43

      Pages: 69-73

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Reduction of active nucleation site density under gamma ray irradiation.2005

    • Author(s)
      Imai, Y., K.Okamaoto, H.Madarame, T.Takamasa
    • Journal Title

      Thermal Science & Engineering 13 (5)

      Pages: 17-23

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Prediction method of critical power by film flow rate measurement and subchannel analysis.2005

    • Author(s)
      Akiba, M., T.Takamasa, S.Morooka
    • Journal Title

      Heat Transfer-Asian Research 34 (5)

      Pages: 309-323

    • NAID

      110004999527

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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