デューン‐平坦床遷移に及ぼす圧力勾配の影響

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  • The effect of pressure gradient on the dune-flat bed transition
  • デューン ヘイタンショウ センイ ニ オヨボス アツリョク コウバイ ノ エイキョウ

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The effect of pressure gradient on the dune-flat bed transition is studied in terms of linear and weakly nonlinear stability analysis. We employ the Kovacs & Parker bedload transport formula extended to incorporate the effect of pressure gradient on the lee side of dunes proposed by Yamaguchi & Izumi.The linear anlysis reveals that the critical Froude number is slightly increased due to the effect of pressure gradient. The nonlinear stability analysis reveals that the effect of pressure gradient renders the bifurcation pattern at the dune-flat bed transition subcritical in the range of relatively large resistance coefficients.

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