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Study on a mechanism of sheet-flow sediment transport

Research Project

Project/Area Number 03650429
Research Category

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

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionKagoshima University

Principal Investigator

ASANO Toshiyuki  Kagoshima Univ., Dept. of Eng. Associate Professor, 工学部, 助教授 (40111918)

Co-Investigator(Kenkyū-buntansha) NISHI Ryuichiro  Kagoshima Univ., Dept. of Eng. Research Associate, 工学部, 助手 (30189253)
Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsSheet-flow / Beach change / Sediment transport / Stormy wave / boundary layer Oscillatory / mixture Sediment-fluid / Saltation / Particle dynamics / シ-トフロ-漂砂
Research Abstract

Study on sheet-flow sediment transport has recently attracted much interest because severe beach erosions and shoalings of fairway occur under this mode. There have been many studies on sediment transport under low fluid tractive force. In comparison, the behavior of fluid/sediment mixture under high fluid tractive force is poorly understood. In this study, motions of sediment particles under oscillatory flows were measured with a high speed video camera, and the properties were carefully analyzed. The main results are as follows.
(1) The thickness of the sheet flow layer increases almost linearly with the Shields parameter. Meanwhile the thickness of the saltation layer does not increase with it noticeably.
(2) The profile of sediment concentration can be represented by an exponentially decay curve in the saltation layer, and an upward convex curve in the sheet-flow layer.
(3) The sediment transport rate was measured by the following two ways. One is estimated by the product of sediment concentration and sediment transport velocity, the other is to direct-trace a group of painted particles in the video frame. As a result, the two methods yield little difference in the obtained sediment transport rate. Little difference is also found between particle materials used as the sediment.
(4) The obtained sediment transport rates are plotted in the center of scatters reported by other researchers previously. The results also agree well with those predicted by Madsen-Grant formula.
(5) Although this investigation does not cover a very wide experimental range, the above obtained results yield useful information on the mechanics of the sheet-flow and quantitative description of the sediment transport.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Toshiyuki Asano: "A model on oscillatory flows over plain movable bed" Proceedings of the International Conference on Multiphase Flows. 1. 109-112 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 浅野 敏之・中村 和夫 中野 康弘・高沢 俊満: "シートフロー状態の底質移動に関する実験的研究" 海岸工学論文集. 39. 296-300 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshiyuki Asano: "Observations of granular-fluid wixture under an oscillatory sheet flow" Proceedings of 23rd International Confer-ence on Coastal Eugineering. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 浅野 敏之・中野 康弘・玉井 賢治: "振動流作用下におけるシートフロー状態の漂砂量の測定" 海岸工学論文集. 40. (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshiyuki Asano: "A model on oscillatory flows over plain movable bed" Proc. of Inter. Conf. on Multiphase Flows. Vol. 1. 109-112 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshiyuki Asano, Kazuo Nakamura, Yasuhiro Nakano and Toshimitsu Takazawa: "An experimental study on sediment transport under sheet flow mode." Proc. of Coastal Engineering. Vol. 39, (1). 296-300 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshiyuki Asano: "Observations of granular-fluid mixture under an oscillatory sheet flow" Proc. of 23rd Inter. Conf. on Coastal Engineering. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshiyuki Asano, Yasuhiro Nakano and kenji Tamai: "Measurements on sheet flow sediment transport under oscillatory flows" Proc. of Coastal Engineering. Vol. 40. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Toshyuki Asano: "A model on oscillatory flows over plain movable bed" Proceeclings of international Couference on Multiphase Flows. 1. 109-112 (1991)

    • Related Report
      1992 Annual Research Report
  • [Publications] 浅野 敏之・中村 和夫・中野 康弘・高沢 俊満: "シートフロー状態の底質移動に関する実験的研究" 海岸工学論文集. 39. 296-300 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Toshiyuki Asano: "Observation of granular-fluid mixture under an oscillatory sheet flow" Proceedings of International Conference on Coastal Engineering. (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 浅野 敏之・中野 康弘,玉井 賢治: "振動流作用下におけるシートフロー状態の漂砂量の測定" 海岸工学論文集. 40. (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] Toshiyuki Asano: "A Model on Oscillatory Flows over Plain Movable Beds" Proceedings of the International Conference on Multiphase Flows. 1. 109-112 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] 浅野 敏之: "シ-トフロ-状態の底質の移動機構" 海岸工学論文集. 39. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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