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1994 Fiscal Year Final Research Report Summary

DESIGN PRINCIPLES OF NATURE-ORIENTED RIVER IMPROVEMENT BASED ON FLUVIAL HYDRAULICS

Research Project

Project/Area Number 04555126
Research Category

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

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

Principal Investigator

MURAMOTO Yoshio  Kyoto Univ., Dept.of Civil Eng., Professor, 大学院・工学研究科, 教授 (50027223)

Co-Investigator(Kenkyū-buntansha) FUJITA Yuichiro  Gifu Univ., Dept.of Civil Eng., Professor, 工学部, 教授 (90027285)
YAMASAKA Masashige  Kanazawa Insti.of Tech., Dept.of Civil Eng., Asso.Prof., 工学部, 助教授 (20174641)
ISHII Chimataro  Akita Univ., Dept.of Civil Eng., Asso.Prof., 鉱山学部, 助教授 (80006676)
HASEGAWA Kazuyoshi  Hokkaido Univ., Dept.of Civil Eng., Instructor, 工学部, 助手 (70001328)
IKEDA Hiroshi  Univ.of Tsukuba, Environ.Res.Center, Asso.Prof., 地球科学系, 助教授 (20015986)
Project Period (FY) 1992 – 1994
KeywordsNature-oriented river works / River environment / River improvement / Mountainous rivers / Sand bars / River bank erosion / Revetment / Hydraulic experiment
Research Abstract

This research project has been executed to make clear the design principle of nature oriented improvement works from the view point of the advanced fluvial hydraulics. At first, we discussed the concept of nature concerning to rivers and the fundamental functions of the nature-oriented improvement works based on the field reconnaissance. Then, the key factors for designing the nature-oriented improvement works have been studied by the field investigation, hydraulic experiments and theoretical approaches.
The formation of longitudinal bed profiles of alluvial rivers were clarified on the type of river composed of a gravel-bed reach with steep slope and sand-bed reach with mild slpoe. The effect of vegetation on the riverbank formation are also examined by a large-scale experimental flume.
On the mechanism of bed-step formation in mountainous streams, the following results have been deduced. The step-pools are generated due to the interaction of antidunes and diagonal cross waves in supercritical flows. When wave lengths of antidunes and water surface waves coincide each other, the antidunes turns out to be diagonal one and then the surface waves begin to be amplified.
In order to establish guide lines for designing the bank slope of nature-oriented revetments, the velocity and boundary shear stress distributions in trapezoidal channels with various slopes of side bank were derived by an analytical method. The calculated results were in good agreement with the experimental ones.
The multiple step types of revetment were discussed based on physical model tests to clarify the stability of ripraps. The formation process of local flow and scour at flow convergent parts along revetments are discussed from the results of experiments. On the design of riverbed protection works, a series of experimental studies was carried out using several types of protection works. Some methods using riprap works to reduce scour depth were proposed.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 長谷川和義: "張り芝水路における浮遊砂濃度分布と側岸堆積" 水工学論文集. 39. 727-732 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 藤田裕一郎: "多自然型護岸周辺の流れ特性に関する実験" 水工学論文集. 39. 557-564 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 石井千万太郎: "河道水衝部の局所浪と洗掘に及ぼす護岸勾配効果に関する実験的研究" 水工学論文集. 39. 741-746 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 長谷川和義: "渓流における淵・瀬(ステップ・プール)の形成機構とその設計指針" 水工学論文集. 40. 893-900 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山坂昌成: "緩傾斜側壁を有する台形断面水路内の流速分布とせん断応力分布" 土木学会論文集. II-36. 69-78 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 村木嘉雄: "護床工下流部における局所洗掘とその軽減法に関する研究" 土木学会論文集. II-37. 21-36 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 池田 宏: "岩盤河床における巨礫の集積によるステップ・プールの形成に関する実験的研究" 筑波大学水理実験センター報告. 21. 25-40 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Hasegawa: "Suspended-Load Transport and Sedimentation on the Grass Covered Bank" Annu.Jour.of Hydrau.Eng.Vol.39. 725-732 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Fujita: "Experiment on Flow Characteristics around Rich-in-Nature Type of Revetments" Annu.Jour.of Hydrau.Eng.Vol.39. 557-564 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] C.Ishii: "An Experimental Study on Effects of Revetment Slope on Local Flow and Scour at a Flow Convertment Part in River Channels" Annu.Jour.of Hydrau.Eng.Vol.39. 741-746 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Hasegawa: "Formation Mechanism of Step-Pool Systems in Steep Rivers and Guide Lines for the Design of Construction" Annu.Jour.of Hydrau.Eng.Vol.40. 893-900 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Yamasaka: "Velocity and Boundary Shear Stress Distribution in Trapezoidal Uniform Channels with Mild Sides Walls" Proc.of JSCE. No.545/II-36. 69-78 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y.Muramoto: "Local Scour and Its Reduction Method in Downstream of Bed Protection Works" Proc.of JSCE. No.551/II-37. 21-36 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Ikeda: "Experimental Flume Study on the Bed-Step Formation in Bedrock Channels" Bull.of Environ.Res.Center. No.21. 25-40 (1996)

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

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Published: 1999-03-09  

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