作用波の波向が四角柱体の局所洗掘に及ぼす影響について Effect of Wave Direction on Local Scour Depth Around Rectangular Columns on a Sand Bed

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Abstract

波による四角柱体の局所洗堀は,四角柱体の形状特性(E/B, D/B:B,D, Eは四角柱体の幅,高さ,厚さ),クーリガン・カーペンター数(KC),砂の限界流速に対する作用波の底面流速の比(U/u。)の他に,作用波の波向きのに関係する。ここでは, B=6.0cm,D二9.0cmで, B/Eがそれぞれ1.0, 2.0および12である3種の四角柱体を波向きに対して角度を変えて実験を行い,各種四角柱体の局所洗握に及ぼす波向き(θ)の影響度合を求めた。 B/Eの大きな四角柱体ほど局所洗堀に及ぼすθの影響が強く現れる。これらの結果は波向きが人工魚礁の局所洗堀に及ぼす影響を考えるうえで参考になる。

In this paper, the effect of wave direction on local scour at rectangular columns was investigated. Localscour depth around rectangular column is variable in association with the shape of column and angle of columnoriented to the direction of waves. In general, the point of maximum scour depth occurred at the comer of thecolumn when column width oriented 90 to the wave direction. At another angle of orientation, the point ofmaximum scour depth tended to move to the cross-sectional comer perpendicular to the wave direction. As aresult, it shows clearly that the effect of wave direction on scour depth was variable in association with theshape of column, referred to column thickness, and also the angle of orientation. The orientation factor, Kθwhich accounts for the effect of wave direction in the scour depth equation, was examined. In conclusion, theeffect of wave direction should be considered as a factor for estimating scour depth of artificial reef.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 37(2), 129-133, 2000-12-01

    The Japanese Society of Fisheries Engineering

References:  4

Codes

  • NII Article ID (NAID)
    10008273852
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09167617
  • NDL Article ID
    5611892
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-1327
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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