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Basic Research on Equivalent Sand-Grain Roughness of the Sand Waves of Small-Scale Having Three-Dimensional Configuration

Research Project

Project/Area Number 63550378
Research Category

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

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

Principal Investigator

HAYASHI Taizo  Chuo Univ., Fac. Sci. & Eng., Prof., 理工学部, 助教授 (60054938)

Co-Investigator(Kenkyū-buntansha) IMAI Takashi  Ditto , Tech. Instruc., 理工学部, 実験講師 (00055071)
OHASHI Masakazu  Ditto , Asst. Prof., 理工学部, 専任講師 (90160598)
青野 利夫  中央大学, 理工学部, 技術員 (90167221)
Project Period (FY) 1988 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1989: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1988: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsSand waves of small scale / Alluvial river bed configurations of small scale / Three-dimensional ripples / Three-dimensional dunes / Equivalent sand-grain roughness / Three-dimensional sand waves of small scale / 相当砂粒粗度 / うろこ状砂連 / 小規模河床波の三次元性 / 河床形状抵抗 / 三次元小規模河床波
Research Abstract

(1) Conditions of occurrence of three-dimensional sand waves of small scale have been studied by means of stability analysis of river bed. Potential flow theory is applied.
The initial rate of growth in dimensionless from of three-dimensional and waves has been obtained as a function of kd with parameters 1/k, Fr and C. Here, k and 1 = wave numbers of three-dimensional sand waves in the undisturbed main flow and spanwise directions, respectively ; d = mean depth of flow : F_r= Froude number ; and C = inclination factor relative to dimensionless delay distance of sediment particle. The domain of hydraulic conditions in which three-dimensional sand waves occur more easily than two-dimensional sand waves has been examined in detail.
(2) About 7,500 reliable data from laboratory flume and field experiments published by previous investigators have been analyzed to obtain the values of equivalent sand-grain roughness of alluvial channel bed. A new diagram is proposed for estimating the equivalent roughness to be formed in alluvial channels.
The analysis made shows that for any energy slope of flow the equivalent roughness in the dimensionless form relative to mean particle size has a distinct maximum for tau_*' = 0.2 about in which tau_*' is dimensionless grain-roughness bed shear stress.
(3) In order to grasp quantitatively the time and spatial variation of channel bed configuration of small scale at their occurrence and development stages a new method of measurement has been devised combining instrumentation by the use of laser slit-sheet illumination and computer-aided image-processing technique.

Report

(4 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] 林 泰造,石 頴: "沖積河川における河床形状相当砂粒粗度" 土木学会第33回水理講演会論文集. 33. 433-438 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashi,Taizo: "Resistance to Flow in Alluvial Channels" Proc.of the 4th Internat.Symposium on River Sedimentation. Vol.1. 514-521 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 泰造・龍見 典明: "3次元性を有する小規模河床波の発生" 土木学会第44回年次学術講演会講演概要集. II300-301 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 泰造: "小規模河床形態と粗度" 土木学会論文集. No.411. II-1-12 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 泰造・大橋 正和・龍見 典明: "発生・発達過程における河床形状変化の画像処理について" 土木学会水工学論文集. 34. 677-682 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 泰造: "昭和63・平成元・2年度文部省科学研究費補助金一般研究(C)研究成果報告書 三次元性を有する小規模河床波の担当砂粒粗度に関する基礎的研究" 林 泰造, 40 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashi, Taizo & Shi, Ying: "Equivalent Bedform Roughness in Alluvial Channels" Proc. of 33rd Jap. Conf. on Hyd. JSCE. Vol. 33. 433-438 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashi, Taizo: "Resistance to Flow in Alluvial Channels" Proc. of 4th Int. Symp. on River Sedimentation, Vol. 1, Int. Research & Training Center on Erosion & Sedim. (Beijing). Vol. 1. 514-521 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashi, Taizo & Tatsumi, Noriaki: "Occurrence of Three-dimensional Sand Waves of Small Scale" Proc. of the 44th Ann. Conf. of JSCE. Part II. 300-301 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashi, Taizo: "Alluvial Bedforms of Small Scale and Roughness" Proc. of JSCE. No. 411/II-12. 1-12 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Hayashi, Taizo ; Ohashi, Masakazu & Tatsumi, Noriaki: "On the Image Processing of the Alluvial Channel Bed Configuration During Its Initial Formation and Development Stages" Proc. of Hyd. Eng., JSCE. Vol. 34. 677-682 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 林 泰造: "啓文堂松本印刷" 文部省科学研究費補助金一般研究(C)課題番号63550378研究成果報告書 三次元性を有する小規模河床波の相当砂粒粗度に関する基礎的研究, 38 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 林泰造,龍見典明: "3次元性を有する小規模河床波の発生" 土木学会第44回年次学術講演概要集. 44. 300-301 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 林泰造: "小規模河床形態と粗度" 土木学会論文集. NO411/II-12. 1-12 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 林泰造 大橋正和・龍見典明: "発生・発達過程における河床形状変化の画像処理について" 水工学論文集. 34. 677-682 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 林泰造: 土木学会第33回水理講演会論文集. 33. 433-438 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] HAYASHI,Taizo.: Proceedings of the 4th International Symposium on River Sedimentation. 1-8 (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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