• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Unstability of meandering streams and river bed erosion by meandering streams

Research Project

Project/Area Number 07650602
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 水工水理学
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

FUJITA Masaharu  Kyoto University, Graduate School of Agriculture, Associate Professor, 農学研究科, 助教授 (60181369)

Co-Investigator(Kenkyū-buntansha) HINOKIDANI Osamu  Tottori University, Engineering, Associate Professor, 工学部, 助教授 (00165127)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1995: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsmeandering stream / meander / river bed erosion / 2-dimensional bed variation / river morphology / numerical simulation / 水みち侵食 / シミュレーション
Research Abstract

An formation process of meandering streams on river beds with non-uniform sediment was investigated experimentally and a simulation method for this process was developed using a 2-dimensional bed variation model. The results of this research are mainly as follows :
(1) A formation process of meandering streams
At the sirst step of the formation process observed in an experiment, the largest gravel stops at the crest of the untidunes. The gravel makes it easy for the transported sediment to be deposited just upstream of the gravel. A sand bar is formed through such a process and consequently a meandering stream is formed. The longitudinal and lateral sorting of bed material makes the stream more stable, but it turn unstable if the fine sediment flows out of the bar.
(2) Development of simulation model
A method for simulating the formation process is developed using a 2-dimensional bed variation model. The comparison between the experimental and calculated results on the bed variation have shown the validity of the method.
(3) Application
The simulation model was applied to the formation process of the meandering streams observed in an experiment. The number and wave length of meandering streams are simulated by this method, but not the changeability of meandering streams. The simulated stream was fixed because the flow structure and sediment transport mechanism near the side walls are not precisely introduced in the model.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 永瀬恭一: "狭窄部を持つ山地河川の河床変動計算" 水工学論文集. 40. 887-892 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 道上正〓: "山地河川の流路変動に関する研究" 第48回土木学会中国支部研究発表会発表概要集. 213-214 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 永瀬恭一: "混合砂を用いた山地河川の河床変動実験" 第51回土木学会年次学術講演会講演概要集. 第2部. 596-597 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Nagase, K.: "Simulation of Bed Evolution around Contraction in Mountanous River" Annual Journal of Hydraulic Engineering, JSCE. 887-892 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Michiue, M.: "River Bed Variation in Mountain Region" Proceedings, 48th Annual Conference, Chugokubranch, JSCE. 213-214 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Nagase, K.: "Experiment on Bed Variation in an Channel with Non-uniform Sediment" Proceedings, 51th Annual Conference, JSCE. 596-597 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 永瀬恭一: "狭窄部を持つ山地河川の河床変動計算" 水工学論文集. 40. 887-892 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 道上正〓: "山地河川の流路変動に関する研究" 第48回土木学会中国支部研究発表会発表概要集. 213-214 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 永瀬恭一: "混合砂を用いた山地河川の河床変動実験" 第51回土木学会年次学術講演会講演概要集. 第2部. 596-597 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 道上正規: "山地河川における流路の形成と変動" 第47回土木学会中国支部研究発表会講演概要集. 161-162 (1995)

    • Related Report
      1995 Annual Research Report

URL: 

Published: 1995-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi