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Study on channel variation in mountain rivers

Research Project

Project/Area Number 01460183
Research Category

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

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

Principal Investigator

ASHIDA Kazuo  Disaster Prevention Research Institute (DPRI) , Kyoto University, Professor, 防災研究所, 教授 (30027205)

Co-Investigator(Kenkyū-buntansha) SATOFUKA Yoshifumi  DPRI., Kyoto University, Research Associate, 防災研究所, 助手 (20215875)
SAWAI Kenji  DPRI., Kyoto University, Associate Professor, 防災研究所, 助教授 (70109073)
SAWADA Toyoaki  DPRI., Kyoto University, Associate Professor, 防災研究所, 助教授 (60027258)
EGASHIRA Shinji  DPRI., Kyoto University, Associate Professor, 防災研究所, 助教授 (00027286)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥5,500,000 (Direct Cost: ¥5,500,000)
Fiscal Year 1990: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1989: ¥3,800,000 (Direct Cost: ¥3,800,000)
KeywordsMountain Stream / River Morphology / Braided Channel / Sediment Transportation / Sediment Yield / Sediment Sorting / 流路の分裂・統合 / 流砂量 / 流砂の量的、質的変動
Research Abstract

A large amount of sediment is commonly deposited in the regions with a wide section of mountain streams where sediment yields are very active. Stream channels formed there are braided even in a high flood because the flot width is too wide to form a stable stream. The project of this study is to investigate the processes of channel variation and their associated phenomena such as variation of bed load, sediment sorting and so on. The results obtained from the research are summarized as follows :
1. Several streams are commonly produced in a flume bed chosen for the present study. resulting in a braided channel system. The flow direction and width of each stream change in time and space, which brings about varieties of the number of stream as well as of the whole flow width in the braided channel system.
2. Such variations of streams in the system are more active in the bed with graded material than with uniform one, because a stream bifurcation occurs more frequently due to a sediment sorting in the former case.
3. The sediment discharge rate increases with the decreases of the flow width and the number of stream in the cross section under consideration. In other words, it increases in a converging process of stream and vice versa in a bifurcating phase.
4. It is necessary to specify the parameters such as the flow width of each stream and the number of stream formed in the system for the prediction of bed load distribution. A formula of the flow width is developed in terms of a criterion for alternating bar formation. It is very useful for evaluating a temporally averaged sediment rate.

Report

(3 results)
  • 1991 Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 芦田 和男: "網状流路の流路変動と流砂量" 京都大学防災研究所年報. 第33号Bー2. 242-260 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 芦田 和男: "蛇行流路におけるSorting現象および平衡河床形状に関する研究" 京都大学防災研究所年報. 第33号Bー2. 266-279

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 芦田 和男: "山地流域における出水と土砂流出(19)" 京都大学防災研究所年報. 第33号Bー2. 281-292 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 芦田 和男: "網状流路における流砂量" 水工学論文集. 第35巻. 391-396 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 芦田 和男: "蛇行流路における流砂の分級および河床変動に関する数値解析" 水工学論文集. 第35巻. 383-390 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 江頭 進治: "連続体モデルに基づく流砂量式の誘導" 水工学論文集. 第35巻. 441-446 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ashida, K.: "Variation of braided streams and sediment discharge" Annuals, Disaster Prevention Research institure (DPRI). No. 33B-2. 242-260 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ashida, K.: "Runoff process, sediment yield and transport in a mountain watershed (19)" Annuals, DPRI. No. 33B-2. 281-292 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ashida, K.: "Sorting and bed topography in meander channels" Annuals, DPRI. No. 33B-2. 261-279 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ashida, K.: "Variation of sediment discharge in braided channels" Proc. Hydraulic Eng., JSCE. 35. 391-396 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Ashida, K.: "Numerical method on sediment sorting and bed variation in meander channels" Proc. Hydraulic Eng., JSCE. 35. 383-390 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Egashira, S.: "Derivation of bed-load formula from a view point of continuum body" Proc. Hydraulic Eng., JSCE. 35. 441-446 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 芦田 和男: "網状流路の流路変動と流砂量" 京都大学防災研究所年報. 第33号Bー2. 242-260 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 芦田 和男: "蛇行流路におけるSorting現象および平衡河床形状に関する研究" 京都大学防災研究所年報. 第33号Bー2. 266-279 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 芦田 和男: "山地流域における出水と土砂流出(19)" 京都大学防災研究所年報. 第33号Bー2. 281-292 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 芦田 和男: "網状流路における流砂量" 水工学論文集. 第35巻. 391-396 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 芦田 和男: "蛇行流路における流砂の分級および河床変動に関する数値解析" 水工学論文集. 第35巻. 383-390 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 江頭 進治: "連続体モデルに基づく流砂量式の誘導" 水工学論文集. 第35巻. 441-446 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 芦田和男: "網状流路の変動と流砂量" 京都大学防災研究所年報. 33号B-2. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 芦田和男: "山地河川の出水と土砂流出" 京都大学防災研究所年報. 33号B-2. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 江頭進治: "エネルギ-散逸機構に基づく流砂モデル" 京都大学防災研究所年報. 33号B-2. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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