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Run-off process of suspended sediment in mountain rivers

Research Project

Project/Area Number 09460069
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 林学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

FUJITA Masaharu  KYOTO UNIV., AGRI., ASSOC.PROF., 農学研究科, 助教授 (60181369)

Co-Investigator(Kenkyū-buntansha) SAWADA Toyoaki  KYOTO UNIV.D.P.R.I,ASSOC.PROF., 防災研究所, 助教授 (60027258)
MIZUYAMA Takahisa  KYOTO UNIV., AGRI., PROF., 農学研究科, 教授 (00229717)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥3,400,000 (Direct Cost: ¥3,400,000)
KeywordsSuspended load / Mountain river / Runoff process / Diffusion theory / Diffusion equation / Source term / Field observation / Flood / 土砂流出 / 流砂 / 濃度分布 / 乱流
Research Abstract

1. Stream flows and runoff process of suspended sediment
We observed suspended sediment concentration, flow discharge and rainfall intensity simultaneously in the Takahara river basin and discussed their relationship. As a result, the following matters were found out. Suspended load concentration is strongly dependent on rainfall intensity, but the relation between them is not unique because the soil on slopes is quickly washed out. The relation between flow discharge and suspended load concentration is not also unique because of the same reason. This change in the situation of source areas should be studied in future.
2. Diffusion theory of suspended sediment
According to previous study, the diffusion equation of suspended sediment which is generally used cannot explain a suspended sediment concentration in a steep channel with a large roughness without the much larger diffusion coefficient In this paper, we have presented a diffusion equation with a source term and shown the concentration in the above-mentioned channel can be expressed by means of the equation with the ordinary diffusion coefficient.
3. Modeling of runoff process of suspended sediment
If the boundary condition of suspended load concentration is given, the runoff process of suspended sediment in river systems can be analyzed by means of the presented diffusion theory. However, the boundary condition can not be easily evaluated because the sediment production process is too complex. We will study more about this point.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 藤田正治: "山地河川の浮遊砂濃度分布" 1999土木学会関西支部年次学術講演会概要集. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 藤田正治: "生成項を考慮した拡散方程式に基づく浮遊砂濃度分布" 第54回土木学会年次学術講演会講演概要集. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 滝口茂隆: "ソース項を考慮した浮遊砂拡散理論" 1999年度砂防学会研究発表会概要集. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 木下篤彦: "砂防ダムからの土砂流出が渓流環境に与える影響" 1999年度砂防学会研究発表会概要集. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Masaharu Fujita: "Suspended load concentration in mountain rivers" Proceedings of 1999 Annual Conference of JSCE,Kansai Branch. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Masaharu Fujita: "Suspended sediment concentration by means of a diffusion equation with a source term" Proceedings of 54th Annual Conference of JSCE. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Takiguchi Shigetaka: "Diffusion equation with a source term" Proceedings of 1999 Annual Conference of JSECE. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Kinoshita Atsuhiko: "The influence of sediment flash out from sabo dam on river environment" Proceedings of 1999 Annual Conference of JSECE. (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] 藤田正治: "山地河川の浮遊砂濃度分布" 平成11年土木学会関西支部年次学術講演会. (発表予定). (1999)

    • Related Report
      1998 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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