An Expression for Non-Equilibrium Transport Rate of Bed Load and Calculations of Bottom Transformation

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  • 非平衡掃流砂量の一表示法と河床変化
  • ヒ ヘイコウ ソウリュウサリョウ ノ イチヒョウジホウ ト カショウ ヘンカ

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A simple expression for the non-equilibrium transport rate of bed load was derived from consideration about the “relaxation process” which occurs on transient process of sand movement on movable bed. In this derivation of the equations for the expression, examinations of the following effects were involved also; propagation of disturbance on the river bed and saltation motion of sand particles.<BR>And one-and two-dimensional calculation methods were deduced for estimating the river bottom transformation processes. Both methods based on flow analysis for non-uniform or unsteady flow and the present non-equilibrium transport rate of bed load formula. Two cases of the bottom transformation processes were calculated by these methods; recovery from a local scouring profile to flat bed by supercritical flow and the formation of alternative bars in the.experimental channel.<BR>The bottom profiles and bottom transformations processes obtained by these methods showed close agreement with those observed in movable bed experiments. That is, the model proposed in this paper is capable of describing the aspects of non-equilibrium sand movement on movable bed.

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