緩傾斜側壁を有する台形断面水路の流速分布とせん断応力分布  [in Japanese] VELOCITY AND BOUNDARY SHEAR STRESS DISTRIBUTION IN TRAPEZOIDAL UNIFORM CHANNELS WITH MILD SIDE WALLS  [in Japanese]

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Abstract

近年の河川の横断形状は, 高親水性や多自然型の配慮から, 低水護岸や堤防の緩傾斜化がはかられることが多い. このような断面形を設計するにあたっては, 流速分布やせん断応力分布を見積もることも重要となるが, これを解析的に扱った手法は現在のところ見あたらない. 本研究では, 緩傾斜側岸の河道横断面形状を台形断面で代表させ, 側壁領域の渦動粘性係数をその地点の局所水深と関連づけて, 渦動粘性係数の横断的な変化まで考慮した流速分布と壁面せん断応力分布の推定式を解析的に得た. これにより, 任意の側斜面角に対して, せん断応力分布の変化を容易に知ることが可能となった. また, 従来のせん断応力分布の推定法の利点, 欠点についても明らかにした.

Recently, a variety of plane forms and cross-sectional forms are applied to river designing in order to introduce a lot of naturalization to river environments. One of them is milder lateral slopes of side banks. In the present study, velocity and boundary shear stress distribution in trapezodal uniform channels with mild side walls are derived analytically, with the eddy viscosity which depend on local water depth and shear velocity. Calculated velocity distribution is compared with observed data of laboratory experiment. Calculated boundary shear stress distributions are compared with simple methods, which are called vertical depth method and normal depth method.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 545, 69-78, 1996-08-21

    Japan Society of Civil Engineers

References:  11

Codes

  • NII Article ID (NAID)
    10001792712
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    02897806
  • NDL Article ID
    4027765
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  NDL  J-STAGE 
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