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1992 Fiscal Year Final Research Report Summary

Experimeutal study of the Mechanism of Heterogeneous Sediment Transport in a closed duct.

Research Project

Project/Area Number 02452296
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 自然地理学
Research InstitutionUniversity of Tsukuba

Principal Investigator

MATSUMOTO Eiji  Univ. of Tsukuba, Inst. of Geoscience, Assoc, Prof., 地球科学系, 助教授 (10015571)

Co-Investigator(Kenkyū-buntansha) ISEYA Fujiko  Jobu Univ., Dept. of Commercial Sci Assoc. Prof., 商学部, 助教授 (00193384)
IKEDA Hiroshi  Univ. of Tsukuba, Inst. of Geoscience, Assoc. Prof., 地球科学系, 助教授 (20015986)
Project Period (FY) 1990 – 1992
KeywordsSediment transport / Heterogeneous sediment / Closed duct / Dunes / Sedimentary structure / Rivers / Flume experiments
Research Abstract

We have conducted an experimental study of the nature of bed features in unidirectionary flows as a function of flow strength and sediment sorting by formulating several sediment mixtures with the same mean size of about 4 mm but with wide varying sorting and making series of run at several mean flow velocities over each sediment mixture. In order to conduct this US-Japan cooperative project, a new recirculating flow duct was built at the Environmental Research Center (ERC) in Tsukuba. When the bed shear stress is larger than twice the critical shear stress of the largest grains on the bed, dunes develop on a gravel bed in the closed duct. As the migration rate of dunes are twice the mean travel velocities of sediment, bedload transport rate may be evaluated by the migration rate of dunes. When the bed shear stress is smaller than the critical shear stress of the coarse population among bed material, the fine fraction moves as thin patches or small starved dunes over an immobile coarse substrate. There is a continuous transition between sheets and dunes over a range of botu discharge and proportion of fine grains.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 池田宏・伊勢屋ふじこ・小玉芳敬: "大井川上流の沖積堆における岩屑の流動・堆積" 筑波大学農林技術センター演習報告. 10. 1-25 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池田宏・伊勢屋ふじこ小玉芳敬・J.Southard P.Wilcock: "礫床に形成される砂堆" 筑波大学水理実験センター報告. 17. 1-15 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Ikeda, H., Iseya, F. & Kodama, Y.: "Sedimentation on an alluvial cone in the upper Oi river, Central Japan" Bull. Tsukuba Univ. Forest. 10. 1-25 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ikeda, H., Iseya, F., Kodama, Y. Southard, J.B. & Wilcock, P.R.: "Dunes in gravel-bed rivers." Bull. Environm. Res. Center, Univ. Tsukuba. 17. 1-15 (1993)

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

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Published: 1994-03-24  

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