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1991 Fiscal Year Final Research Report Summary

Buoyancy Effects on Hydrodynamics of Semi-Enclosed Bay

Research Project

Project/Area Number 02302067
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionOsaka Sangyo University

Principal Investigator

MUROTA Akira  Osaka Sangyo University, Department of Civil Engineering, Professor, 工学部, 教授 (50028924)

Co-Investigator(Kenkyū-buntansha) OOKUBO Kenji  Kyoto University, Disaster Prevention Research Institute, Research Associate, 防災研究所, 助手 (50135612)
OONISHI Sotoaki  Tokyo Science Univ., Department of Civil Engineering, Professor, 理工学部, 教授 (20103062)
MICHIOKU Kohji  Kobe University, Department of Civil Engineering, Associate Professor, 工学部, 助教授 (40127303)
MURAOKA Kohji  Osaka University, Department of Civil Engineering, Professor, 工学部, 教授 (90029017)
NAKATSUJI Keiji  Osaka University, Department of Civil Engineering, Associate Professor, 工学部, 助教授 (10029324)
Project Period (FY) 1990 – 1991
KeywordsStratified flow / Semi-enclosed Sea / Front / Water exchange / Tidal flow system / Wing-induced current / Water quality / Internal wave
Research Abstract

Four research meetings have been held during two years of the project term for promoting mutual understanding about the role of density-induced currents on the hydrodynamics of semi-enclosed bays, and discussing the following synthetical themes ; (a) the effects of external forces and geometries of semi-enclosed bay on the flow and density structure ; (b) the buoyancy effects on turbulent transport of momentum and passive water qualities such as temperature, salinity and turbidity ; and (c) individual subjects studied in individual coastal and estuarine waters by co-operative investigators. The results of individual subjects are as follows :
(l) Murota and Nakatsuji develop a three-dimensional baroclinic model for examining ther hydrodynamics of an estuarine front and a tidal front observed in Osaka Bay. The mutual effects of stratification, the earth's rotation and tidal modulation are clarified quantitatively.
(2) Fujiwara clearly shows the estuarine circulation in Osaka, Bay on the ba … More sis of many field observations. Taking note of stratification structure in the narrow entranced embayments such as Osaka Bay, the constant current system is classified depending on the induced forces ; tidally-induces and buoyancy-induced residual currents.
(3) Muraoka and Nakatsuji analyze hydrodynamically field data of temperature and velocity fluctuations which were measured related with the upwelling phenomena of 'Aoshio' (anoxic water) often observed in Tokyo Bay. A two-dimensional experiments are performed to clarify the mechanism of upwelling and mixing of two-layered stratified flow system exposed to wind stresses at the surface.
(4) Murakami carries out hydraulic experiments for examining the effects of geometrically-induced horizontal circulation and buoyancyinduced vertical circulation on the water exchange when the breakwater is constructed at the mouth of enclosed bay.
Furthermore, the numerical experiments were performed for clarifying the dependency of numerical schemes such as layer model and level model on the resulting difference in the computed vertical circulation.
(5) Oonishi develops a system for the analysis of river effluent spreading using satellite data. Effluent from the Singuu River are analyzed as an example to study the difference in the dispersion areas detected by water temperature and water turbidity.
(6) Ookubo measured temperature fluctuations due to the interfacial waves in a shallow North Lake in Australia within the range between the internal wave of buoyancy frequency and the surface wind ripple and evaluate the vertical eddy viscosity coefficient under the influence of stratification. These results are compared with observation results obtained in the south water of Biwa Lake.
(7) Michioku measured temperature and velocity fluctuations in Nunobiki Reservoir, Kobe and analyzed the relationship between their fluctuations and meteorological factors such as wind and temperature. The flow structure and mixing process in a stratified reservoir are clarified. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Nakatsuji,K.: "Outflow and Three Dimensional Spreading of River Water in Enclosed Bay" Marine Pollution Bulletion. 23. 31-35 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中辻 啓二: "東京湾の青湖の発生機構に関する基礎実験" 水工学論文集. 35. 603-608 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Fujiwara,T.: "Effect of the Earth Rotation on Tide Induced Sediment Transport" Proc.Coastal Sediments '91. 395-404 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 大西 外明: "ランドサットTMデ-タによる河川放流水拡散域の定量的解析" 海岸工学論文集. 38. 196-200 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Michioku,K.: "Seasonal Thermal Cycle in Stratified Deep Lakes" Jour.Hydroscience and Hydraulic Engineering. 9-1. 11-26 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村上 和男: "海水交換における水平・鉛直循環流の効果" 海岸工学論文集. 38. 836-840 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakatsuji, K.: "Outflow and Three Dimensional Spreading of River Water" Mar. Pollu. Bull.23. 31-35 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakatsuji, K.: "Basic Experiments on Upwelling of Anoxic Water 'Aoshio' Observed in Tokyo Bay" Proc. Hydr. Eng.35. 603-608 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Fujiwara, T.: "Effect of the Earth Rotation on Tide Induced Sediment Transport" Proc. Coastal Sediment. 395-404 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Oonishi, S.: "Quantitative Estimation of the Diff-Area of the River Effluent with Landsat TM Data" Proc. Coastal Eng., JSCE. 38. 196-200 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Michioku, K.: "Seasonal Thermal Cycle in Stratified Deep Lake" Jour, Hydrosci. Hydr. Eng.9-1. 11-26 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Murakami, K.: "The Influence of Horizontal and Vertcal Circulation on Water Exchange in Enclosed Bay" Proc. Coastal Eng., JSCE. 38. 836-840 (1991)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-03-16  

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