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Thermosolutal transport in reservoirs generated by release and leaching of salinity and nutrients from anaerobic bed

Research Project

Project/Area Number 10650505
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionKobe University

Principal Investigator

MICHIOKU Kohji  Dept. Architecture and Civil Engin., Kobe Univ., Associate Professor, 工学部, 助教授 (40127303)

Co-Investigator(Kenkyū-buntansha) MIYAMOTO Hitoshi  Dept. Architecture and Civil Engin., Kobe Univ., Research Associate, 工学部, 助手 (50283867)
OONARI Hirofumi  Dept. Civil Engin., Tokuyama Junior College, Professor, 教授 (30045041)
KANDA Tohru  Dept. Architecture and Civil Engin., Kobe Univ., Professor, 工学部, 教授 (30029144)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1998: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsReservoir Dynamics / Algae Bloom / Thermal Siphon / Buoyancy Flows / Eutrophication / Thermosolutal Convection / Internal Circulation / Double Diffusion / 閉鎖水域 / 水質環境
Research Abstract

In eutrophic reservoirs, high concentration of nutrients and ionic matters are released from the bed under badly anaerobic condition. Since the leaching process produces high salinity or heavy water mass on the bed, it gravitationally generates an inclined plume on the sloping bed and transport heat and mass to the bottom layer. This process may bring serious eutrophication of bottom water.
In order to predict heat and mass flux due to the thermosolutal transport and device a countermeasure against this, the following were examined. (1)Focusing on heat and salinity balance in the anaerobic bottom water, a water quality measurement was performed in a eutrophic reservoir. (2)Release flux of salinity from the bed was examined in an experimental model in which the bed materials sampled from the reservoir were installed in a tank and filled with anaerobic water. (3)Using a micro-bubble aerator system, an in-situ experiment of water purification was carried out. (4)A model experiment and an a … More nalysis on the inclined plume were performed in order to investigate buoyancy and flow fields.
The main findings are as follows. The thermosolutal convection is the main reason of making the reservoir bottom water to be extraordinary heavy and salty. Because of its very stable salinity stratification, the impounded water has never been overturned in the last many years. It makes the bottom water to be more seriously eutrophicated. It is the plume convection of warm water from the shallow layer to the bottom layer that is responsible for producing an inverse temperature stratification in the bottom layer. The heat and mass flux can be computed by the plume theory which was verified with the experimental data. The flux law was successfully applied for computing heat and salinity balance observed in the field survey. The micro-bubble aeration system was found to be very useful for promoting vertical mixing and aerating the bottom layer. After starting the aeration, the heavy and anaerobic bottom water mass was completely disappeared and the reservoir was fully overturned.
The next step we should take is to develop a prediction tool of water quality by considering the thermosolutal convection process. We should also continue the water purification experiment for improving the system to be of user-convenience. Less

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (35 results)

All Other

All Publications (35 results)

  • [Publications] Michioku, K. and Kanda, T.: "Nutrient transport due to heat-salt convection in a eutrophic reservoir"Proc. 28th Conf. IAHR. 28 (CD-ROM). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kanda, T., Miyamoto H. and Iwami, S.: "Measurement of Suspended Solid Concentration by Using Image Processing Technique"Proc. 28th Conf. IAHR. 28 (CD-ROM). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 道奥康治: "貯水池底層水の水面散布に関する基礎実験"応用力学論文集. 2. 685-690 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 大成博文: "マイクロバブルの高機能性と水質浄化"資源処理技術. 46-4. 238-244 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 道奥康治、神田徹、大成博文他: "マイクロバブル・エアレータによる貯水池の水質浄化実験"水工学論文集. 44(印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 神田徹、宮本仁志: "ウェーブレット変換を用いた開水路凹部流れの組織運動の解析"水工学論文集. 44(印刷中). (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 道奥康治: "水理公式集[平成11年版],第6編 水環境編"土木学会. 713 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Miyamoto,H., Kanda,T. and Iwami,S.: "Development of method for measuring suspended solid concentration by using image processing of luminance (in Japanese)"Proc. Construction Institute. Vol.40-A. 67-80 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Oonari,H..: "Technique of micro-bubble generation and its application to water environment rejuvenation (in Japanese)"J. Japan Society of Junior College. Vol.3-4. 12-20 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Michioku,K.: "Flow analysis of a thermal siphon system (in Japanese)"Memories of Graduate School, Kobe Univ.. Vol.17-A. 51-56 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Michioku,K., Yasuda,A., Matsushita,K. and Takahashi,T.: "Accumulation of heat and nutrients in a reservoir bottom due to heat-salt convection (in Japanese)"Annual J. Hydraulic Engineering. Vol.43. 1055-1060 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Michioku,K., Kanda,T. and Ishikawa,K.: "Sampling of internal waves and natural convection in a reservoir based on water temperature measurements (in Japanese)"Annual J. Hydraulic Engineering. Vol.43. 1049-1054 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kanda,T., Miyamoto,H. and Iwami,S.: "An image processing method for measuring suspended solid concentration considering effect of multiple scattering (in Japanese)"Annual J. Hydraulic Engineering. Vol.43. 767-772 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Michioku,K. and Kanda,T.: "Nutrient transport due to heat-salt convection in a eutrophic reservoir"Proc. 28th Conf. IAHR. (CD-ROM). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kanda,T., Miyamoto,H. and IWAMI,S.: "Measurement of Suspended Solid Concentration by Using Image Processing Technique"Proc. 28th Conf. IAHR. (CD-ROM). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Michioku,K..: "Experiment on water quality improvement of a reservoir by showering bottom cold water onto the water surface (in Japanese)"J. Applied Mechanics. Vol.2. 685-690 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Oonari,H., Saga,T., Watanabe,K., Maeda,K. and Matsuo,K.: "High functional characteristics of micro-bubbles and water purification"Resources and Disposal Engineering. 46-4. 238-244 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Michioku,K., Kanda,T., Oonari,H., Nishikawa,T., Matsuo,K. and Kido,T.: "A preliminary experiment on reservoir water purification by using a micro-bubble aeration system (in Japanese)"Annual J. Hydraulic Engineering. Vol.44 (in print). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Kanda,T. and Miyamoto,H.: "Analysis on organized structures in an open channel trench by using a wavelet transformation"Annual J. Hydraulic Engineering. Vol.44 (in print). (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 道奥康治: "熱塩循環による貯水池底層での熱と栄養塩の集積機構,"水工学論文集. 43. 1055-1060 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] 大成博文: "マイクロバブル発生技術と水環境蘇生"日本高専学会誌. 3-4. 12-20 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] Kanda,T: "Mesurement of Suspended Solid Concentration by Using Image Processing Technique"Proc.28th Conf.IAHR. 28(SD-ROM). (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Michioku,K.: "Nutrient transport due to heat-salt convection in a eutrophic reservoir"Proc.28th Conf.IAHR. 28(SD-ROM). (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 大成博文: "マイクロバブルの高機能性と水質浄化"資源処理技術. 46-4. 238-244 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 道奥康治: "マイクロバブル・エアレータによる貯水池の水質浄化実験"水工学論文集. 44(印刷中). (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 道奥康治(分担執筆): "水圏の環境"東京電機大学出版局. 404 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] 道奥康治(分担執筆): "水理公式集[平成11年版],第6編 水環境編"土木学会. 713 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 道奥康治: "サーマルサイフォンの流動解析" 神戸大学大学院自然科学研究科紀要. 17-B. (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 神田徹: "貯水池での水温計測に基づく内部波・自然対流の抽出" 水工学論文集. 43. 1049-1054 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 道奥康治: "熱塩循環による貯水池底層での熱と栄養塩の集積機構" 水工学論文集. 43. 1055-1060 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 神田徹: "光の多重散乱の影響を考慮した浮遊物質濃度の画像計測法" 水工学論文集. 43. 767-772 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 東野誠: "桟粗面における底泥から流水への物質移動" 水工学論文集. 43. 773-778 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大成博文: "壁乱流の縦断面せん断構造" 土木学会論文集. 593/II-43. 31-40 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 有田正光: "水圏の環境" 東京電機大学出版局, 404 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 道奥康治(分担執筆): "土木用語大辞典" 土木学会編,技報堂出版, 1656 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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