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1989 Fiscal Year Final Research Report Summary

Studies on the laws for sand transport in bed load by waves, winds and currents

Research Project

Project/Area Number 62420040
Research Category

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

Allocation TypeSingle-year Grants
Research Field Hydraulic engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

TSUCHIYA Yoshito  Professor, Disaster Prevention Research Institute, Kyoto University, 防災研究所, 教授 (90025883)

Co-Investigator(Kenkyū-buntansha) YAMASHITA Takao  Instructor, Disaster Prevention Research Institute, Kyoto University, 防災研究所, 助手 (30111983)
Project Period (FY) 1987 – 1989
KeywordsBed load / Sand drift / Blown sand / Sand transport rate / Sediment transport / Threshold of sand movement / Dynamic response / Two-phase flow
Research Abstract

In this study, theoretical investigations of the laws for sand transport in bed load by waves, winds and currents were made in order to unify the mechanism of sand transport by these actions. The main results are:
1) A theory of the dynamical response of sand grains to turbulence was proposed taking into account the virtual mass and uplift forces due to the shear effect. The dynamical response characteristics of sand grains to turbulence in air and water were solved. By this theory, the threshold of sand movement by waves, winds and currents were dynamically formulated and the theoretical results were in good agreement with experimental ones.
2) The dynamics of motion of a sand grain as saltation or sliding by waves, winds and currents was established. The characteristics of the sand grain motion were obtained. The influence of the virtual mass force and wave acceleration force were made clear.
3) In the saltation the mechanism of collision of a saltating sand grain to the granular bed wa … More s dynamically formulated both in uniform and graded sand. By the theoretical result, the influence of the distribution of graded sand on the transport rate of graded sand in blown sand was well explained with experimental and field data of sand transport.
4) By applying the momentum conservation law in a saltation layer, the law for sand transport rates was theoretically formulated in the uniform condition introducing the saltation characteristics. The formulas agree well with experimental data of sand transport.
5) In order to extend the law for sand transport rates in the uniform condition to that in the unsteady condition, the governing equations of sand -fluid two-phase systems were derived. By integrating it over the waterdepth from the bottom to the water surface, the conservation equations of sand transport rates were obtained. The equations are one of the generalized expression of sand transport rates and may be extended as the basic theory of sand transport by waves, winds and currents. Less

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 土屋義人,坂野雅人: "漂砂形態とその発生領域" 土木学会第34回海洋工学講演会論文集. 222-226 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuchiya,Y.: "Sand transport by wind:Transport rates of unifrom and graded sand" Proceedings of the Speciality Conference on Advances in Understanding of Coastal Sediment Processes,ASCE. 175-187 (1987)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuchiya,Y.and M.Banno: "The criterion of ripple formation by wave action" Proceedings of the 21st Coastal Engineering Conference,ASCE. 1868-1881 (1988)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 土屋義人,三島豊秋,上田充: "飛砂・移動限界の理論" 土木学会海洋工学論文集. 36. 344-348 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuchiya,Y.and M.Banno: "On the dynamical response of sand grain to turbulence and the rate of sediment transport in bed load" Journal of the Waterway,Port,Coastal & Ocean Engineering,ASCE. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 土屋義人,朝堀泰明: "波による円〓周辺の局所洗堀-初期洗掘の機構-" 土木学会海洋工学論文集(投稿予定). 37. (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuchiya, Y. and M. Banno: "Sand transport states by wave action and their criterion" Proceedings of the 34th Coastal Engineering Conference, JSCE. 222-226 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuchiya, Y. and M. Banno: "The criterion of ripple formation by wave action" Proceedings of the 21st Coastal Engineering Conference, ASCE, 1988, pp. 1868-1881.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuchiya, Y., T. Mishima and M. Ueda: "Theory of the threshold of sand movement by wind" Proceedings of Coastal Engineering, JSCE, Vol. 36, 1989, pp. 344-348(in Japanese).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuchiya, Y. and M. Banno: "On the dynamic response of sand grain to turbulence and the rate of sediment transport in bed load" Journal of Waterway, Port, Coastal & Ocean Engineering, ASCE. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuchiya, Y.: "Sand transport by wind: Transport rates of uniform and dreaded sand" Proceedings of the Speciality Conference on Advances in Understanding of Coastal Sediment Processes, ASCE, 1987, pp. 175-187.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsuchiya, Y. and Y. Asahori: "Sand transport rate in relation to wave induced mass transport" Proceedings of Coastal Engineering Vol. 37, 1990.

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

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Published: 1993-03-26  

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